Prof. Koen Clays Profile

Prof. Koen Clays

Professor at KU Leuven

SPIE Involvement:

Author

Area of Expertise:

nonlinear optics , organic materials , hyper-Rayleigh scattering , second-harmonic generation , nanophotonics , multiphoton fluorescence

Websites:

Company Website

Publications (78)

Proceedings Article | 6 October 2023 Presentation

Presentation

Harmonic light scattering probes amorphous precursor during nucleation and growth of metal-organic framework ZIF-8

Ahmet Dok, Yovan de Coene, Olivier Deschaume, Carmen Bartic, Eric Breynaert, Christine Kirschhock, Koen Clays, Monique van der Veen, Thierry Verbiest, Stijn van Cleuvenbergen

Proceedings Volume PC12681, PC126810E (2023) https://doi.org/10.1117/12.2676722

KEYWORDS: Light scattering, Crystals, Crystallization, Nonlinear optics, Nonlinear crystals, X-rays, Synchrotrons, Nanoparticles, Nanocrystals, Micro optical fluidics

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Proceedings Article | 6 October 2023 Presentation

Presentation

Label-free imaging of cellular activity through second-harmonic generation

Yovan de Coene, Carmen Bartic, Koen Clays, Thierry Verbiest, Stijn Jooken, Stijn van Cleuvenbergen, Pieter Vanden Berghe

Proceedings Volume PC12681, PC1268105 (2023) https://doi.org/10.1117/12.2676376

KEYWORDS: Second harmonic generation, Biological imaging, Dyes, Reflection, Optical surfaces, Kidney, Electrolytes, Electric fields

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Proceedings Article | 24 May 2022 Poster + Paper

Poster + Paper

Rewritable hollow sphere photonic crystal based paper with ionic liquid as ink for a durable written information storage system

W. Vander Ghinst, K. Zhong, Y. de Coene, K. Clays

Proceedings Volume 12131, 121310O (2022) https://doi.org/10.1117/12.2620954

KEYWORDS: Photonic crystals, Polymers, Liquids, Optical spheres, Particles, Reflectivity, Refractive index, Data storage, Water, Transmission electron microscopy

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Proceedings Article | 20 August 2020 Presentation

Presentation

Advances in high-performance hybrid electro-optics

Lewis Johnson, Huajun Xu, Scott Hammond, Delwin Elder, Stephanie Benight, Yovan de Coene, Joseph Hesse-Withbroe, Koen Clays, Larry Dalton, Bruce Robinson

Proceedings Volume 11471, 114710B (2020) https://doi.org/10.1117/12.2568921

KEYWORDS: Electro optics, Quantum computing, Organic materials, Silicon, Gold, Waveguides, Wafer-level optics, Optical components, Lithium niobate, Nanophotonics

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Proceedings Article | 10 September 2019 Presentation

Presentation

Next-generation materials for hybrid electro-optic systems (Conference Presentation)

Lewis Johnson, Huajun Xu, Yovan de Coene, Delwin Elder, Koen Clays, Larry Dalton, Bruce Robinson

Proceedings Volume 11089, 110890K (2019) https://doi.org/10.1117/12.2530719

KEYWORDS: Electro optical systems, Electro optics, Refractive index, Organic materials, Silicon, Gold, Waveguides, Chromophores, Anisotropy, Mechanical engineering

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Proceedings Article | 14 September 2018 Presentation + Paper

Presentation + Paper

Development of molecular probes for cellular imaging combining second harmonic generation and two-photon fluorescence

K. Clays

Proceedings Volume 10738, 107381D (2018) https://doi.org/10.1117/12.2323412

KEYWORDS: Luminescence, Nonlinear optics, Scattering, Fluorescent proteins, Molecules, Second-harmonic generation, Optical imaging, Absorption, Hyper Rayleigh scattering, Harmonic generation

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Proceedings Article | 7 September 2018 Paper

Paper

Ultrafast revealing of invisible patterns encrypted in colloidal photonic crystals

Kuo Zhong, Kai Song, Koen Clays

Proceedings Volume 10724, 107241D (2018) https://doi.org/10.1117/12.2320945

KEYWORDS: Photonic crystals, Particles, Refractive index, Crystals, Liquids, Water, Plasma etching

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Proceedings Article | 29 August 2017 Presentation + Paper

Presentation + Paper

Colloidal photonic crystals: from lasing to microfluidics

Koen Clays, Kuo Zhong, Kai Song

Proceedings Volume 10355, 103550B (2017) https://doi.org/10.1117/12.2275726

KEYWORDS: Photonic crystals, Molecular self-assembly, Biomimetics, Microfluidics, Laser crystals, Chemistry, Particles, Optical properties, Dielectrics, Photons

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Proceedings Article | 23 September 2016 Presentation + Paper

Presentation + Paper

Investigation of the second hyperpolarizability of Ru-alkynyl complexes by z-scan and nonlinear scattering

Nick Van Steerteghem, Stijn Van Cleuvenbergen, Noor Aisyah Ahmad Shah, Mark Humphrey, Thierry Verbiest, Koen Clays

Proceedings Volume 9939, 99390G (2016) https://doi.org/10.1117/12.2237203

KEYWORDS: Scattering, Transmittance, Refractive index, Femtosecond phenomena, Laser scattering, Absorption, Nonlinear optics, Molecules, Ruthenium, Calibration

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Proceedings Article | 27 February 2015 Paper

Paper

Introducing high-quality planar defects into colloidal crystals via self-assembly at the air/water interface

Kuo Zhong, Pieter-Jan Demeyer, Xingping Zhou, Olga Kruglova, Niels Verellen, Victor Moshchalkov, Kai Song, Koen Clays

Proceedings Volume 9371, 93710L (2015) https://doi.org/10.1117/12.2075937

KEYWORDS: Optical spheres, Silica, Solids, Crystals, Interfaces, Picosecond phenomena, Particles, Photonic crystals, Refractive index, Molecular self-assembly

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Proceedings Article | 2 May 2014 Paper

Paper

Fabrication of polymer inverse opals with linear and nonlinear optical functionalities using a sandwiching approach

Pieter-Jan Demeyer, Stefaan Vandendriessche, Stijn Van Cleuvenbergen, Sophie Carron, Tatjana Parac-Vogt, Thierry Verbiest, Koen Clays

Proceedings Volume 9127, 912704 (2014) https://doi.org/10.1117/12.2052132

KEYWORDS: Luminescence, Photonic crystals, Nanoparticles, Polymers, Silica, Upconversion, Refractive index, Etching, Epoxies, Doping

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Proceedings Article | 15 October 2012 Paper

Paper

An all-optical protocol to determine the molecular origin of radiation damage/enhancement in electro-optic polymeric materials

Javier Pérez-Moreno, Stijn Van Cleuvenbergen, Maarten Vanbel, Koen Clays, Edward Taylor

Proceedings Volume 8519, 85190C (2012) https://doi.org/10.1117/12.929297

KEYWORDS: Polymers, Electro optic polymers, Chromophores, Polymer thin films, Gamma radiation, Electro optics, Absorption, Modulators, Thin films, Glasses

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Proceedings Article | 11 October 2012 Paper

Paper

The role of the polymer host on reversible photodegradation in Disperse Orange 11 dye

Sheng-Ting Hung, Shiva Ramini, David Wyrick, Koen Clays, Mark Kuzyk

Proceedings Volume 8474, 84741A (2012) https://doi.org/10.1117/12.929944

KEYWORDS: Polymers, Molecules, Polymethylmethacrylate, Picosecond phenomena, Absorption, Polarization, Diffusion, Chromophores, Photodetectors, Molecular aggregates

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Proceedings Article | 10 October 2012 Paper

Paper

Novel cationic dye and crosslinkable surfactant for DNA biophotonics

Lewis Johnson, Luke Latimer, Stephanie Benight, Zachary Watanabe, Delwin Elder, Bruce Robinson, Carrie Bartsch, Emily Heckman, Griet Depotter, Koen Clays

Proceedings Volume 8464, 84640D (2012) https://doi.org/10.1117/12.964958

KEYWORDS: Ultraviolet radiation, Chromophores, Electro optics, Composites, Glasses, Thin films, Absorption, Biopolymers, Biomedical optics, Modulators

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Proceedings Article | 10 October 2012 Open Access

Open Access

Paper

DNA, sugars, and proteins at work in optics

Koen Clays

Proceedings Volume 8464, 84640M (2012) https://doi.org/10.1117/12.928837

KEYWORDS: Chromophores, Absorption, Proteins, Luminescence, Molecules, Photonic crystals, Nonlinear optics, Fluorescence resonance energy transfer, Fluorescent proteins, Optical properties

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Proceedings Article | 1 May 2012 Paper

Paper

Nonlinear optical properties of conjugated polymers

Guy Koeckelberghs, Inge Asselberghs, Koen Clays, Thierry Verbiest

Proceedings Volume 8435, 84350D (2012) https://doi.org/10.1117/12.921208

KEYWORDS: Polymers, Molecules, Chromophores, Nonlinear optics, Polymerization, Modulation, Spectroscopy, Hyper Rayleigh scattering, Circular dichroism spectroscopy, Molecular electronics

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Proceedings Article | 25 April 2012 Paper

Paper

Tuning the properties of colloidal magneto-photonic crystals by controlled infiltration with superparamagnetic magnetite nanoparticles

P. J. Demeyer, M. Bloemen, T. Verbiest, K. Clays

Proceedings Volume 8425, 84251R (2012) https://doi.org/10.1117/12.922299

KEYWORDS: Photonic crystals, Nanoparticles, Silica, Crystals, Magnetism, Absorbance, Refractive index, Molecular self-assembly, Bioalcohols, Absorption

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The performance of magnetic-field sensors and optical isolators is largely determined by the efficiency of the active materials. This efficiency could be dramatically increased by integrating Faraday materials in photonic crystals. For this purpose, monodisperse nanospheres were self-assembled into a colloidal photonic crystal and magnetic functionality was introduced by dipping the photonic crystal in a suspension containing superparamagnetic nanoparticles. Reflection and absorbance measurements of these magneto-photonic crystals revealed clear relationships between the time spent in suspension and the position and strength of the photonic band gap. When additional magnetic material was introduced, the band gap was red shifted and the strength of the band gap was decreased. Using Bragg's law and the Maxwell-Garnet approximation for effective media, the filling fraction of the magneto-photonic crystals was calculated from the observed red shift. While superparamagnetic nanoparticles did confer magneto-optical properties to the photonic crystal, they also increased the absorption, which can be detrimental as the Faraday effect is measured in transmission. Therefore a trade-off exists in the optical regime between the amount of Faraday rotation and the absorption. By carefully controlling the filling fraction, this trade-off was investigated and optimized for photonic crystals with different band gaps. Both polystyrene and silica photonic crystals were filled with superparamagnetic nanoparticles. In case of the polystyrene photonic crystals, it was found that the maximum achievable filling fraction was influenced by the size of the polystyrene nanospheres. Smaller polystyrene nanospheres gave rise to smaller pore diameters and a faster onset of pore blocking when filled with superparamagnetic nanoparticles. As a result, the maximum achievable filling fraction was also lower. Pore blocking was found to be negligible in silica photonic crystals. Together with a higher mechanical strength, this makes silica photonic crystals more suited for the fabrication of colloidal magneto-photonic crystals. In this paper, a nanoscale engineering approach is described to carefully control the filling fraction of magneto-photonic crystals. This allows fine-tuning the absorption and the position and strength of the photonic band gap. By tailoring the properties of magneto-photonic crystals, the means for application-specific designs and a better description of Faraday effects in 3D magneto-photonic crystals are provided.

SPIE Journal Paper | 26 March 2012

Thermal study of the photonic band gap effect on a resonance energy transfer process

Luis González-Urbina, Javier Pérez-Moreno, Branko Kolaric, Koen Clays

JPE, Vol. 2, Issue 1, 021204, (March 2012) https://doi.org/10.1117/12.10.1117/1.JPE.2.021204

KEYWORDS: Molecules, Energy transfer, Fluorescence resonance energy transfer, Molecular energy transfer, Organic light emitting diodes, Photonic crystals, Resonance energy transfer, Absorption, Molecular photonics, Luminescence

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Proceedings Article | 9 February 2012 Paper

Paper

Probing live samples in second-harmonic generation microscopy using specific markers and fluorescent proteins

E. De Meulenaere, R. Paesen, S. Psilodimitrakopoulos, M. Ameloot, P. Loza-Alvarez, J. Vanderleyden, K. Clays

Proceedings Volume 8226, 82263C (2012) https://doi.org/10.1117/12.907498

KEYWORDS: Second-harmonic generation, Proteins, Fluorescent proteins, Microscopy, Luminescence, Chromophores, Microscopes, Molecules, Polarization, Imaging systems

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Proceedings Article | 20 September 2011 Paper

Paper

Modeling the hyperpolarizability dispersion with the Thomas-Kuhn sum rules

Kurt De Mey, Javier Perez-Moreno, Koen Clays

Proceedings Volume 8113, 81130V (2011) https://doi.org/10.1117/12.893482

KEYWORDS: Absorption, Nonlinear optics, Chromophores, Molecules, Data modeling, Hyper Rayleigh scattering, Dispersion, Chemistry, Near infrared, Precision calibration

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Proceedings Article | 19 September 2011 Paper

Paper

Spontaneous chirality in an octupolar discotic crystal

Stijn Van Cleuvenbergen, Monique Van der Veen, Inge Asselberghs, Gunther Hennrich, Thierry Verbiest, Koen Clays

Proceedings Volume 8113, 81130F (2011) https://doi.org/10.1117/12.893488

KEYWORDS: Second-harmonic generation, Polarization, Crystals, Molecules, Nonlinear optics, Chromophores, Nonlinear crystals, Dichroic materials, Statistical modeling, Signal detection

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Proceedings Article | 14 September 2011 Paper

Paper

Unexpected second-order nonlinear optical effects in conjugated polymers

Inge Asselberghs, Koen Clays, Thierry Verbiest, Guy Koeckelberghs

Proceedings Volume 8164, 81640K (2011) https://doi.org/10.1117/12.894422

KEYWORDS: Polymers, Nonlinear optics, Protactinium, Transistors, Light emitting diodes, Solar cells, Photodiodes, Polarization, Absorption, Remote sensing

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Proceedings Article | 7 September 2011 Paper

Paper

Optimizing the second-order nonlinear optical response in some indoline-based chromophores at the molecular and macroscopic levels

Ayele Teshome, M. Delower Bhuiyan, Mohamed Ashraf, Graeme Gainsford, Andrew Kay, Stijn Van Cleuvenbergen, Inge Asselberghs, Koen Clays

Proceedings Volume 8113, 81130G (2011) https://doi.org/10.1117/12.892312

KEYWORDS: Second-harmonic generation, Nonlinear optics, Chromophores, Absorption, Polymers, Molecules, Thin films, Signal detection, Polymer thin films, Electroactive polymers

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Proceedings Article | 7 September 2011 Paper

Paper

Why do we need three levels to understand the molecular optical response?

Javier Perez-Moreno, Koen Clays, Mark Kuzyk

Proceedings Volume 8113, 81130L (2011) https://doi.org/10.1117/12.893477

KEYWORDS: Molecules, Polarizability, Polarization, Electro optical modeling, Electrons, Molecular photonics, Nonlinear optics, Nonlinear response, Complex systems, Absorption

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Proceedings Article | 1 September 2011 Paper

Paper

Hyper-Rayleigh scattering as a screening tool for the optimization of piezoelectric polymers

Javier Pérez-Moreno, Koen Clays

Proceedings Volume 8164, 81640I (2011) https://doi.org/10.1117/12.893495

KEYWORDS: Polymers, Molecules, Hyper Rayleigh scattering, Crystals, Chromophores, Polarization, Quartz, Polarizability, Space mirrors, Space telescopes

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Proceedings Article | 9 June 2011 Paper

Paper

Simultaneous SHG and 2PEF imaging using a new type of selective markers

E. De Meulenaere, S. Van Cleuvenbergen, S. Psilodimitrakopoulos, J. Vanderleyden, P. Loza-Alvarez, K. Clays

Proceedings Volume 8086, 80861B (2011) https://doi.org/10.1117/12.889612

KEYWORDS: Second-harmonic generation, Microscopy, Luminescence, Microscopes, Photons, Plasma, Nonlinear optics, Absorption, Optical filters, Toxicity

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Proceedings Article | 14 September 2010 Paper

Paper

Designing organic molecules for terahertz radiation generation in robust crystals

Koen Clays, Rebecca Docherty, John Fielden, Madeleine Helliwell, James Raftery, Rachel Shaw, Catherine Swanson, Benjamin Coe

Proceedings Volume 7817, 78170E (2010) https://doi.org/10.1117/12.862289

KEYWORDS: Crystals, Nonlinear crystals, Nonlinear optics, Chromophores, Terahertz radiation, Molecules, Electrons, Chemical species, Chemistry, Second-harmonic generation

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Proceedings Article | 24 August 2010 Paper

Paper

Bio-inspired nano-engineering and genetic modification for nonlinear optical imaging

Evelien De Meulenaere, Wouter Vanderlinden, Jos Vanderleyden, Koen Clays

Proceedings Volume 7765, 77650K (2010) https://doi.org/10.1117/12.862180

KEYWORDS: Chromophores, Absorption, Luminescence, Fluorescent proteins, Nonlinear optics, Proteins, Optical properties, Ocean optics, Genetics, Hyper Rayleigh scattering

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Proceedings Article | 18 August 2010 Paper

Paper

Analysis of the unusual wavelength dependence of the first hyperpolarizability of porphyrin derivatives

K. De Mey, K. Clays, Michael Therien, David Beratan, Inge Asselberghs

Proceedings Volume 7774, 777403 (2010) https://doi.org/10.1117/12.859819

KEYWORDS: Absorption, Chromophores, Transition metals, Oscillators, Chemical elements, Nonlinear optics, Hyper Rayleigh scattering, Molecules, Supramolecular assemblies, Chemistry

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Proceedings Article | 18 August 2010 Paper

Paper

Conjugated polymers: a hyper-Rayleigh scattering study

Inge Asselberghs, Edith Franz, Koen Clays, Guy Koeckelberghs, Thierry Verbiest

Proceedings Volume 7774, 77740B (2010) https://doi.org/10.1117/12.860209

KEYWORDS: Polymers, Hyper Rayleigh scattering, Protactinium, Modulation, Luminescence, Transistors, Nonlinear optics, Absorption, Dichroic materials, Oxidation

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Proceedings Article | 18 August 2010 Paper

Paper

Predicting the nonlinear optical response in the resonant region from the linear characterization: a self-consistent theory for the first-, second-, and third-order (non)linear optical response

Javier Pérez-Moreno, Koen Clays, Mark Kuzyk

Proceedings Volume 7774, 777404 (2010) https://doi.org/10.1117/12.860202

KEYWORDS: Nonlinear response, Absorption, Chromophores, Molecules, Nonlinear optics, Molecular photonics, Polarizability, Dispersion, Amplitude modulation, Hyper Rayleigh scattering

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Proceedings Article | 18 May 2010 Paper

Paper

Second-order nonlinear optical properties of zwitterionic chromophores

Ayele Teshome, Inge Asselberghs, David Clarke, Ayla Middleton, M. Delower Bhuiyan, Gerald Smith, Andrew Kay, Koen Clays

Proceedings Volume 7722, 772228 (2010) https://doi.org/10.1117/12.854664

KEYWORDS: Absorption, Molecules, Chromophores, Nonlinear optics, Molecular aggregates, Mass attenuation coefficient, Absorbance, Hyper Rayleigh scattering, Optical properties, Oscillators

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Proceedings Article | 18 May 2010 Paper

Paper

Towards a unifying theory for the first-, second-, and third-order molecular (non)linear optical response

Javier Pérez-Moreno, Koen Clays, Mark Kuzyk

Proceedings Volume 7722, 772224 (2010) https://doi.org/10.1117/12.854199

KEYWORDS: Nonlinear response, Absorption, Molecules, Molecular photonics, Polarizability, Chromophores, Chemistry, Amplitude modulation, Hyper Rayleigh scattering, Electro optical modeling

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Proceedings Article | 12 May 2010 Paper

Paper

Molding resonant energy transfer by colloidal crystal: Dexter transfer and electroluminescence

Luis González-Urbina, Branko Kolaric, Wim Libaers, Koen Clays

Proceedings Volume 7713, 771306 (2010) https://doi.org/10.1117/12.854480

KEYWORDS: Photonic crystals, Crystals, Molecules, Luminescence, Fluorescence resonance energy transfer, Energy transfer, Electroluminescence, Resonance energy transfer, Solids, Phosphorescence

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Proceedings Article | 9 September 2009 Paper

Paper

Faraday rotation in magnetic colloidal photonic crystals

Wim Libaers, Branko Kolaric, Renaud Vallée, John Wong, Jelle Wouters, Ventsislav Valev, Thierry Verbiest, Koen Clays

Proceedings Volume 7467, 74670C (2009) https://doi.org/10.1117/12.824515

KEYWORDS: Particles, Photonic crystals, Iron, Oxides, Magnetism, Crystals, Silica, Nanoparticles, Scanning electron microscopy, Optical spheres

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Proceedings Article | 21 August 2009 Paper

Paper

Nonlinear optical properties of photoswitchable fluorescent proteins

Inge Asselberghs, Cristina Flors, Evelien De Meulenaere, Benoît Champagne, Jos Vanderleyden, Koen Clays

Proceedings Volume 7403, 74030P (2009) https://doi.org/10.1117/12.824552

KEYWORDS: Chromophores, Fluorescent proteins, Proteins, Nonlinear optics, Absorption, Luminescence, Green fluorescent protein, Hyper Rayleigh scattering, Microscopy, Demodulation

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Proceedings Article | 21 August 2009 Paper

Paper

Nano-engineering of materials for nonlinear optical imaging

Koen Clays, Jos Vanderleyden, Harry Anderson

Proceedings Volume 7413, 74130J (2009) https://doi.org/10.1117/12.824517

KEYWORDS: Second-harmonic generation, Chromophores, Absorption, Nonlinear optics, Luminescence, Fluorescent proteins, Signal detection, Optical imaging, Microscopy, Optical properties

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Proceedings Article | 21 August 2009 Paper

Paper

Role of the conjugated spacer in the optimization of second-order nonlinear chromophores

Javier Pérez-Moreno, Koen Clays, Mark Kuzyk

Proceedings Volume 7413, 741306 (2009) https://doi.org/10.1117/12.828038

KEYWORDS: Molecules, Chromophores, Bridges, Modulation, Polarization, Absorption, Nonlinear response, Molecular bridges, Quantum efficiency, Nonlinear optics

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Proceedings Article | 21 August 2009 Paper

Paper

Electrochemically induced switching of the second-order nonlinear optical response

Inge Asselberghs, Koen Clays

Proceedings Volume 7413, 74130U (2009) https://doi.org/10.1117/12.827977

KEYWORDS: Second-harmonic generation, Electrodes, Switching, Nonlinear optics, Thin films, Hyper Rayleigh scattering, Molecules, NOx, Platinum, Oxidation

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Proceedings Article | 21 August 2009 Paper

Paper

Nano-engineering of magnetic and ellipsoidal colloidal photonic crystals

Wim Libaers, Tao Ding, Branko Kolaric, Renaud A. Vallée, John Wong, Koen Clays, Kai Song

Proceedings Volume 7413, 74130P (2009) https://doi.org/10.1117/12.824516

KEYWORDS: Crystals, Particles, Silica, Magnetism, Photonic crystals, Optical spheres, Molecular self-assembly, Glasses, Dielectrics, Bioalcohols

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Proceedings Article | 2 September 2008 Paper

Paper

Photonic crystals for improved light harvesting

Koen Clays, Branko Kolaric, Kasper Baert, Renaud A. L. Vallée

Proceedings Volume 7049, 70490J (2008) https://doi.org/10.1117/12.793233

KEYWORDS: Photonic crystals, Luminescence, Energy transfer, Crystals, Fluorescence resonance energy transfer, Light harvesting, Chromophores, Particles, Microscopes, Energy efficiency

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Proceedings Article | 2 September 2008 Paper

Paper

Hyper-Rayleigh scattering for solution phase structure determination

Koen Clays, Michael Therien, Gunther Hennrich

Proceedings Volume 7049, 70490B (2008) https://doi.org/10.1117/12.793236

KEYWORDS: Chromophores, Nonlinear optics, Hyper Rayleigh scattering, Absorption, Molecules, Solid state electronics, Oscillators, Ruthenium, Metals, Multiphoton fluorescence microscopy

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Proceedings Article | 6 May 2008 Paper

Paper

Tuning of spontaneous emission in photonic crystals by resonant energy transfer and magnetic fields

W. Libaers, K. Baert, R. A. Vallée, B. Kolaric, K. Clays

Proceedings Volume 6989, 69890N (2008) https://doi.org/10.1117/12.780261

KEYWORDS: Photonic crystals, Magnetism, Luminescence, Quantum dots, Rhodamine B, Energy transfer, Crystals, Fluorescence resonance energy transfer, Silica, Bioalcohols

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Proceedings Article | 16 April 2008 Paper

Paper

Sum-rules and quantum limits: nonlinear optics from first principles

Javier Pérez-Moreno, Koen Clays, Mark Kuzyk

Proceedings Volume 6999, 699922 (2008) https://doi.org/10.1117/12.781230

KEYWORDS: Molecules, Quantum efficiency, Modulation, Electrons, Chromophores, Nonlinear optics, Polarization, Nonlinear response, Absorption, Bridges

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Proceedings Article | 16 April 2008 Paper

Paper

Benzathiazoliums and pyridiniums for second-order nonlinear optics

Edith Franz, Elizabeth Harper, Benjamin Coe, Pavol Zahradnik, Koen Clays, Inge Asselberghs

Proceedings Volume 6999, 699923 (2008) https://doi.org/10.1117/12.781194

KEYWORDS: Luminescence, Absorption, Nonlinear optics, Chromophores, Hyper Rayleigh scattering, Molecules, Crystals, Solids, Modulation, Scattering

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Proceedings Article | 16 April 2008 Paper

Paper

Organic materials for molecular switching

Inge Asselberghs, Gunther Hennrich, Jon McCleverty, Leila Boubekeur-Lecaque, Benjamin Coe, Koen Clays

Proceedings Volume 6999, 69991W (2008) https://doi.org/10.1117/12.779751

KEYWORDS: Nonlinear optics, Switching, Demodulation, Molecules, Switches, Hyper Rayleigh scattering, Second-harmonic generation, Thin films, Luminescence, Oxidation

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Proceedings Article | 26 September 2007 Paper

Paper

Record-high intrinsic hyperpolarizabilities for polymeric electro-optic modulators

Javier Pérez-Moreno, Inge Asselberghs, Yuxia Zhao, Kai Song, Hachiro Nakanishi, Shuji Okada, Kyoko Nogi, Oh-Kil Kim, Jongtae Je, Janka Mátrai, Marc De Maeyer, Mark Kuzyk, Koen Clays

Proceedings Volume 6713, 671303 (2007) https://doi.org/10.1117/12.731349

KEYWORDS: Chromophores, Molecules, Modulation, Absorption, Bridges, Electro optics, Electrons, Nonlinear response, Polymers, Electro optic polymers

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Proceedings Article | 13 September 2007 Paper

Paper

Modulated conjugation for record-high intrinsic hyperpolarizabilities

Javier Pérez-Moreno, Koen Clays, Mark Kuzyk, Yuxia Zhao, Yuquan Shen, Ling Qiu, Juming Hao

Proceedings Volume 6653, 66530W (2007) https://doi.org/10.1117/12.730845

KEYWORDS: Chromophores, Modulation, Molecules, Bridges, Quantum efficiency, Physics, Hyper Rayleigh scattering, Nonlinear optics, Spectroscopy, Absorption

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Proceedings Article | 13 September 2007 Open Access

Open Access

Paper

Photonic superlattices for photonic crystal lasers

Koen Clays, Kasper Baert, Mark Van der Auweraer, Renaud Vallée

Proceedings Volume 6653, 665302 (2007) https://doi.org/10.1117/12.730699

KEYWORDS: Photonic crystals, Superlattices, Crystals, Molecules, Luminescence, Particles, Solids, Silica, Laser crystals, Refractive index

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Proceedings Article | 14 September 2006 Paper

Paper

Control and switching of first hyperpolarizability by pH

Inge Asselberghs, Gunther Hennrich, Benjamin Coe, Koen Clays

Proceedings Volume 6331, 633104 (2006) https://doi.org/10.1117/12.678027

KEYWORDS: Absorption, Switching, Demodulation, Luminescence, Modulation, Nonlinear optics, Molecules, Iron, Telecommunications, Chromophores

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Proceedings Article | 14 September 2006 Paper

Paper

Photonic bandgap engineering for spectral narrowing of emission in self-assembled colloidal photonic crystals

Koen Clays, Renaud Vallée, Kasper Baert

Proceedings Volume 6331, 633108 (2006) https://doi.org/10.1117/12.675947

KEYWORDS: Photonic crystals, Superlattices, Crystals, Particles, Molecular self-assembly, Silica, Refractive index, Atmospheric particles, Optical testing, Mineralogy

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Proceedings Article | 30 August 2005 Paper

Paper

Switching of the first hyperpolarisability

Inge Asselberghs, Andrew McDonagh, Michael Ward, Jon McCleverty, Benjamin Coe, Andre Persoons, Koen Clays

Proceedings Volume 5935, 59350V (2005) https://doi.org/10.1117/12.614811

KEYWORDS: Switching, Luminescence, Switches, Electrodes, Hyper Rayleigh scattering, Ruthenium, Iron, Scattering, Molecules, Oxidation

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Proceedings Article | 30 August 2005 Paper

Paper

Why experimental hyperpolarizabilities fall short of the fundamental limits and new approaches for breaking this barrier

Mark Kuzyk, Kakali Tripathi, Koen Clays, Javier Perez-Moreno, Inge Asselberghs, Yuxia Zhao, Kai Song, Janka Matrai, Marc De Maeyer, Benjamin Coe, Anne Myers Kelley, Hachiroy Nakanishi, Oh-Kil Kim

Proceedings Volume 5935, 593507 (2005) https://doi.org/10.1117/12.615807

KEYWORDS: Molecules, Chromophores, Absorption, Scientific research, Chemistry, Nonlinear optics, Nanotechnology, Molecular nanotechnology, Molecular spectroscopy, Optical components

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Proceedings Article | 30 August 2005 Paper

Paper

Combined molecular and supramolecular bottom-up engineering for enhanced nonlinear optical response

Javier Perez-Moreno, Inge Asselberghs, Yuxia Zhao, Kai Song, Hachiro Nakanishi, Shuji Okada, Kyoko Nogi, Oh-Kil Kim, Jongtae Je, Janka Matrai, Marc De Maeyer, Mark Kuzyk, Koen Clays

Proceedings Volume 5935, 59350B (2005) https://doi.org/10.1117/12.613236

KEYWORDS: Chromophores, Molecules, Absorption, Bridges, Nonlinear response, Nanoengineering, Crystals, Electrons, Ions, Medium wave

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Proceedings Article | 10 November 2003 Paper

Paper

Experimental study of the second-order nonlinear scattering properties of a helicene molecule

Koen Clays, Kurt Wostyn, Andre Persoons, Stefano Maiorana, Claude Daul

Proceedings Volume 5212, (2003) https://doi.org/10.1117/12.503813

KEYWORDS: Amplitude modulation, Luminescence, Molecules, Nonlinear optics, Hyper Rayleigh scattering, Scattering, Femtosecond phenomena, Chromophores, Optical properties, Absorption

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Proceedings Article | 10 November 2003 Paper

Paper

Quadratic nonlinear optical properties of transition metal quaterpyridyl complexes

James Harris, Benjamin Coe, Lathe Jones, Bruce Brunschwig, Inge Asselberghs, Koen Clays, Andre Persoons

Proceedings Volume 5212, (2003) https://doi.org/10.1117/12.507853

KEYWORDS: Ruthenium, Absorption, Iron, Nonlinear optics, Microchannel plates, Hyper Rayleigh scattering, Chromophores, Spectroscopy, Chemistry, Visible radiation

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Proceedings Article | 10 November 2003 Paper

Paper

Insertion of a two-dimensional defect into photonic bandgap materials

Yuxia Zhao, Kurt Wostyn, Koen Clays, Andre Persoons

Proceedings Volume 5212, (2003) https://doi.org/10.1117/12.503810

KEYWORDS: Optical spheres, Crystals, Photonic crystals, Absorbance, Scanning electron microscopy, Silica, Crystallography, Photonic crystal devices, Dielectrics, Glasses

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Proceedings Article | 10 November 2003 Paper

Paper

Effect of electronic structure on molecular first hyperpolarizabilities of highly conjugated (polypyridyl)metal-(porphinato)zinc(II) chromophores

Ivan Miloradovic, Yuxia Zhao, Kurt Wostyn, Inge Asselberghs, H. Uyeda, Andre Persoons, Koen Clays, Michael Therien

Proceedings Volume 5212, (2003) https://doi.org/10.1117/12.509147

KEYWORDS: Rutherfordium, Chromophores, Zinc, Molecular electronics, Nonlinear optics, Ruthenium, Osmium, Metals, Transition metals, Supramolecular assemblies

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Proceedings Article | 10 November 2003 Paper

Paper

Utilizing coupled-oscillator photophysics to elaborate chromophores with exceptional molecular hyperpolarizabilities

H. Uyeda, Ivan Miloradovic, Yuxia Zhao, Kurt Wostyn, Inge Asselberghs, Koen Clays, Andre Persoons, Michael Therien

Proceedings Volume 5212, (2003) https://doi.org/10.1117/12.508261

KEYWORDS: Chromophores, Rutherfordium, Zinc, Ruthenium, Nonlinear optics, Osmium, Metals, Oscillators, Argon, Electro optics

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Proceedings Article | 10 November 2003 Paper

Paper

Quadratic nonlinear optical properties of novel pyridinium salts

Benjamin Coe, Lathe Jones, James Harris, Inge Asselberghs, Kurt Wostyn, Koen Clays, Andre Persoons, Bruce Brunschwig, Javier Garin, Jesus Orduna

Proceedings Volume 5212, (2003) https://doi.org/10.1117/12.506832

KEYWORDS: Nonlinear optics, Chromophores, Absorption, Ruthenium, Printed circuit board testing, Crystals, Spectroscopy, Second-harmonic generation, Glasses, Hyper Rayleigh scattering

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Proceedings Article | 18 December 2002 Paper

Paper

Reversible redox-switching of first hyperpolarizability studied by hyper-Rayleigh scattering

Inge Asselberghs, Koen Clays, Andre Persoons

Proceedings Volume 4798, (2002) https://doi.org/10.1117/12.451928

KEYWORDS: Nonlinear optics, Ruthenium, Absorption, Hyper Rayleigh scattering, Switching, Metals, Light scattering, Molecules, Organic materials, Oxidation

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Proceedings Article | 1 November 2002 Paper

Paper

Hyper-Rayleigh scattering for symmetry fluctuation spectroscopy

Koen Clays, Andre Persoons

Proceedings Volume 4812, (2002) https://doi.org/10.1117/12.451376

KEYWORDS: Light scattering, Scattering, Femtosecond phenomena, Dynamic light scattering, Laser scattering, Amplitude modulation, Solids, Hyper Rayleigh scattering, Spectroscopy, Particles

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Proceedings Article | 7 December 2001 Paper

Paper

Time-resolved transmission through a photonic crystal in the complete Fourier domain

Koen Clays, Kurt Wostyn, Andre Persoons

Proceedings Volume 4461, (2001) https://doi.org/10.1117/12.449839

KEYWORDS: Photonic crystals, Crystals, Modulation, Scattering, Phase shifts, Optical spheres, Photons, Phase shift keying, Femtosecond phenomena, Fourier transforms

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Proceedings Article | 7 December 2001 Paper

Paper

Enhancing the accuracy and precision in hyper-Rayleigh scattering: frequency- and angle-resolved femtosecond nonlinear scattering

Koen Clays, Kurt Wostyn, Andre Persoons

Proceedings Volume 4461, (2001) https://doi.org/10.1117/12.449820

KEYWORDS: Luminescence, Scattering, Demodulation, Hyper Rayleigh scattering, Chromophores, Light scattering, Laser scattering, Modulation, Molecules, Nonlinear optics

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Proceedings Article | 29 October 1998 Paper

Paper

High-frequency demodulation of multiphoton fluorescence in hyper-Raleigh scattering

Geert Olbrechts, Tom Munters, Koen Clays, Andre Persoons

Proceedings Volume 3474, (1998) https://doi.org/10.1117/12.328566

KEYWORDS: Luminescence, Modulation, Femtosecond phenomena, Chromophores, Demodulation, Molecules, Amplitude modulation, Multiphoton fluorescence microscopy, Scattering, Nonlinear optics

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Proceedings Article | 29 October 1998 Paper

Paper

Correlation length relaxation times from hyper-Rayleigh scattering in thin films versus second-harmonic generation relaxation times

Koen Clays, Geert Olbrechts, Andre Persoons

Proceedings Volume 3474, (1998) https://doi.org/10.1117/12.328567

KEYWORDS: Chromophores, Polymers, Second-harmonic generation, Molecules, Diffusion, Polymer thin films, Femtosecond phenomena, Hyper Rayleigh scattering, Thin films, Light scattering

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Proceedings Article | 1 November 1996 Paper

Paper

Symmetry of functionalized poly(propylene imine) dendrimers probed with hyper-Rayleigh scattering

Erik Put, Koen Clays, Andre Persoons, Toine Biemans, J. Jansen, R. Kurvers, C. Luijkx, E. Meijer

Proceedings Volume 2852, (1996) https://doi.org/10.1117/12.256167

KEYWORDS: Dendrimers, Molecules, Hyper Rayleigh scattering, Light scattering, Nonlinear optics, Chromophores, Spectroscopy, Polymers, Polarization, Hydrogen

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Proceedings Article | 1 November 1996 Paper

Paper

New organometallic materials for nonlinear optics: metal -arylacetylides

Stephan Houbrechts, Koen Clays, Andre Persoons, Victorio Cadierno, M. Gamasa, Jose Gimeno, Ian Whittall, Mark Humphrey

Proceedings Volume 2852, (1996) https://doi.org/10.1117/12.256164

KEYWORDS: Ruthenium, Metals, Hyper Rayleigh scattering, NOx, Gold, Nonlinear optics, Transition metals, Resonance enhancement, Chromophores, Second-harmonic generation

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Proceedings Article | 5 October 1995 Paper

Paper

Nonlinear optical properties of bacteriorhodopsin, retinal, and related molecules

Eric Hendrickx, Koen Clays, A. Vinckier, Andre Persoons, Christophe Dehu, Jean-Luc Bredas

Proceedings Volume 2527, (1995) https://doi.org/10.1117/12.222788

KEYWORDS: Molecules, Proteins, Absorption, Hyper Rayleigh scattering, Molecular interactions, Second-harmonic generation, Chromophores, Molecular electronics, Chemistry, Optoelectronics

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Proceedings Article | 5 October 1995 Paper

Paper

Optical materials: analysis of the first hyperpolarizability tensor by nonlinear scattering techniques

Koen Clays, Martti Kauranen, Andre Persoons

Proceedings Volume 2527, (1995) https://doi.org/10.1117/12.222785

KEYWORDS: Light scattering, Molecules, Scattering, Nonlinear optics, Hyper Rayleigh scattering, Polarization, Laser scattering, Chemical analysis, Molecular electronics, Laser beam propagation

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Proceedings Article | 5 October 1995 Paper

Paper

Optically nonlinear effects in bulk chiral nematic NLO-polymers: second harmonic generation in chiral nematic polymer films

Gustaaf Moehlmann, H. Berendse, M. Bosma, Koen Clays, Thierry Verbiest, Martti Kauranen, Jeffery Maki, Andre Persoons

Proceedings Volume 2527, (1995) https://doi.org/10.1117/12.222807

KEYWORDS: Nonlinear optics, Second-harmonic generation, Polymers, Molecules, Polarization, Crystals, Liquid crystals, Geometrical optics, Interfaces, Harmonic generation

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Proceedings Article | 5 October 1995 Paper

Paper

Femtosecond hyper-Rayleigh scattering study of spatial orientational correlations between chromophores

Koen Clays, Marvin Wu, Andre Persoons

Proceedings Volume 2527, (1995) https://doi.org/10.1117/12.222791

KEYWORDS: Femtosecond phenomena, Molecules, Hyper Rayleigh scattering, Chromophores, Nonlinear optics, Light scattering, Crystals, Dispersion, Solids, Scattering

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Proceedings Article | 15 May 1994 Paper

Paper

Evaluation of Beta of stilbazolium p-toluenesulfonates by the hyper Rayleigh scattering method

Xuan-Ming Duan, Shuji Okada, Hachiro Nakanishi, Akira Watanabe, Minoru Matsuda, Koen Clays, Andre Persoons, Hiro Matsuda

Proceedings Volume 2143, (1994) https://doi.org/10.1117/12.173833

KEYWORDS: Crystals, Ions, Hyper Rayleigh scattering, Absorption, Nonlinear crystals, Nonlinear optics, Molecules, Light scattering, Molybdenum, Crystallography

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Proceedings Article | 16 December 1993 Paper

Paper

Characterization of polymeric nonlinear optical materials by hyper-Rayleigh scattering in solution

Koen Clays, Eric Hendrickx, Stephan Houbrechts, Myriam Triest, Thierry Verbiest, Andre Persoons, Celest Samyn

Proceedings Volume 2025, (1993) https://doi.org/10.1117/12.165255

KEYWORDS: Chromophores, Polymers, Nonlinear optics, Proteins, Light scattering, Hyper Rayleigh scattering, Molecules, Chemical elements, Molecular aggregates, Particles

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Proceedings Article | 16 December 1993 Paper

Paper

Investigations of the beta-response in organic molecules from dipolar to octupolar systems

Thierry Verbiest, Koen Clays, Andre Persoons, Celest Samyn, Fabienne Meyers, Jean-Luc Bredas

Proceedings Volume 2025, (1993) https://doi.org/10.1117/12.165278

KEYWORDS: Molecules, Absorption, Light scattering, Hyper Rayleigh scattering, Molecular electronics, Laser scattering, Scattering, Nonlinear optics, Nd:YAG lasers, Molecular photonics

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Proceedings Article | 27 April 1993 Paper

Paper

Nonlinear optical properties of bacteriorhodopsin

Eric Hendrickx, Thierry Verbiest, Koen Clays, Andre Persoons

Proceedings Volume 1853, (1993) https://doi.org/10.1117/12.144065

KEYWORDS: Molecules, Light scattering, Chromophores, Proteins, Hyper Rayleigh scattering, Optoelectronics, Laser scattering, Scattering, Linear filtering, Harmonic generation

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Proceedings Article | 25 February 1993 Paper

Paper

Measurements of molecular hyperpolarizabilities using hyper-Rayleigh scattering

Thierry Verbiest, Eric Hendrickx, Andre Persoons, Koen Clays

Proceedings Volume 1775, (1993) https://doi.org/10.1117/12.139195

KEYWORDS: Molecules, Hyper Rayleigh scattering, Light scattering, Ions, Crystals, Silicon, Organic materials, Polarization, Scattering, Nonlinear optics

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Proceedings Article | 25 February 1993 Paper

Paper

Phase-matched second-harmonic generation in waveguides of polymeric Langmuir-Blodgett films

Koen Clays, Thomas Penner, Nancy Armstrong, Douglas Robello

Proceedings Volume 1775, (1993) https://doi.org/10.1117/12.139211

KEYWORDS: Waveguides, Nonlinear optics, Polymers, Polymer thin films, Refractive index, Signal attenuation, Chromophores, Molecules, Organic materials, Polarization

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Showing 5 of 78 publications

Conference Committee Involvement (20)

Planetary Defense and Space Environment Applications

30 August 2016 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments IX

14 August 2015 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments VIII

18 August 2014 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments VII

25 August 2013 | San Diego, California, United States

Optical Processes in Organic Materials and Nanostructures II

25 August 2013 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments VI

13 August 2012 | San Diego, California, United States

Optical Processes in Organic Materials and Nanostructures

12 August 2012 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments V

22 August 2011 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials XI

21 August 2011 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments IV

3 August 2010 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials X

1 August 2010 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments III

3 August 2009 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials IX

2 August 2009 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials VIII

12 August 2008 | San Diego, California, United States

Nanophotonics and Macrophotonics for Space Environments II

11 August 2008 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials VII

28 August 2007 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials VI

15 August 2006 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials V

2 August 2005 | San Diego, California, United States

Linear and Nonlinear Optics of Organic Materials IV

2 August 2004 | Denver, Colorado, United States

Linear and Nonlinear Optics of Organic Materials III

4 August 2003 | San Diego, California, United States

Showing 5 of 20 Conference Committees

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