Dr. Willem Hoving Profile

Dr. Willem Hoving

Photonics Consultant at Photonics Consultancy

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

Photonics , MIcro-assembly , Optical Spectroscopy , Photonics packaging , micro-spectrometer , Fluorescence Spectroscopy

Proceedings Article | 17 June 2024 Paper

A miniaturized tuneable light source using a piezo-actuated Fabry-Pérot interferometer

Astghik Chalyan, Willem Hoving, Wendy Meulebroeck, Heidi Ottevaere

Proceedings Volume 13019, 1301917 (2024) https://doi.org/10.1117/12.3017443

KEYWORDS: Light sources, Miniaturization, Interferometers, Mirrors, Tunable filters, Spectral resolution, Reflectivity, Reflection, Optical filters, Coating thickness

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Proceedings Article | 5 March 2022 Presentation + Paper

Miniaturized time-resolved fluorescence spectrometer system

Anas Gasser, Artem Shcheglov, Thomas Lapauw, Thomas Van den Dries, Hans Ingelberts, Willem Hoving, Maurice Aalders, Maarten Kuijk

Proceedings Volume 12008, 120080B (2022) https://doi.org/10.1117/12.2609535

KEYWORDS: Fluorescence spectroscopy, Laser induced fluorescence, Fluorescence lifetime imaging, Sensors, Luminescence, Spectroscopy, Spectrographs, Calibration, Image sensors, Spectral resolution, Bioalcohols, Spectral calibration

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Proceedings Article | 10 October 2020 Presentation + Paper

Design and prototyping of a multi-segment grating for broadband and miniaturized spectrometer

Gebirie Yizengaw Belay, Willem Hoving, Arthur van der Put, Jürgen van Erps, Michael Vervaeke, Hugo Thienpont, Heidi Ottevaere

Proceedings Volume 11548, 115480S (2020) https://doi.org/10.1117/12.2575166

KEYWORDS: Spectroscopy, Optical design, Short wave infrared radiation, Prototyping, Diffraction gratings, Spectrometer engineering, Diffraction, Image segmentation, Ultraviolet radiation, Signal to noise ratio

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Proceedings Article | 14 April 2020 Presentation + Paper

Compact time-resolved fluorescence spectrometer

Anas Gasser, Thomas Lapauw, Hans Ingelberts, Willem Hoving, Maarten Kuijk

Proceedings Volume 11353, 1135319 (2020) https://doi.org/10.1117/12.2554164

KEYWORDS: Monochromators, Luminescence, Digital micromirror devices, Spectroscopy, Mirrors, Sensors, Time resolved spectroscopy, Fluorescence spectroscopy, Spherical lenses, Spatial light modulators

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Fluorescence-lifetime spectroscopy has been recently used in different applications in rapid medical diagnoses for different diseases, e.g. cancer, oral carcinoma, actinic cheilitis and tissue diagnosis. In addition, it has various applications in biology, chemistry analysis, pharmaceutical applications and physics. The existing fluorescence spectrometer systems are bulky, contain complex optical setups, large and use either monochromators with movable parts, hence less mechanically stable, or use non-tunable bandpass filters. Therefore, the user has to adjust the filters while changing the fluorophore. In this work, we propose a spectrometer setup that can be tuned for different emission wavelength using spatial light modulators (SLM). SLMs use highly stable MEMS micromirrors in their architecture, hence, the system has no large moving parts and is mechanically stable. In addition, the system is suitable for more fluorophores and thus widens the application potentials of the system. Digital micromirror devices (DMD) are widely used in optical projection systems. However, some recent developments were made to use them in conventional optical spectroscopy which enabled using single point detectors to collect the spectrum instead of using linear or area camera sensor arrays. This is expected to have a big effect on the cost of the spectrometer. Using similar techniques, in this work, a light source, e.g. a supercontinuum laser was used along with dichroic filters to fix the excitation wavelength at a certain value. After that, the selected wavelength(s) pass through a beam splitter towards the sample. The beam splitter is installed to separate the emission and excitation light. The fluorescence emission is reflected from the beam splitter and is focused on a diffraction grating. The different wavelengths are projected to the DMD. The used DMD has a VGA resolution with a mirror pitch of 5.4µm. Each micromirror could be controlled individually into two states, on and off at ±17 degrees. The setup ensured that different wavelengths of light always fall on different mirror(s) and hence the desired wavelength(s) could be selected at once. A high-speed-gated single pixel CMOS detector with a large diameter was used to capture the reflected light with the desired wavelengths from the DMD. The system scans the mirrors and hence the wavelengths to readout the spectrum. In addition, the system measures the fluorescence lifetime of the used fluorophore at the emission wavelength. The proposed setup is compact and less complicated than conventional systems. Furthermore, the spectrometer, apart from the light source, has a great potential to be miniaturized. Thus, it can be used as hand-held system. The proposed system was characterized and the proof of concept of the setup was verified. Due to the small pitch of the DMD and the large number of mirrors, it was found that it has a high resolution especially in the VIS spectral range. The system is considered as semi-tunable as it can be tuned for different emission wavelengths and thus, can be used with different fluorophores. However, the light source along with the filters should be changed for different excitation wavelengths. or pulsed laser diodes can be used.

Proceedings Article | 27 April 2016 Paper

Design of a miniaturized integrated spectrometer for spectral tissue sensing

Gebirie Yizengaw Belay, Willem Hoving, Heidi Ottevaere, Arthur van der Put, Wim Weltjens, Hugo Thienpont

Proceedings Volume 9889, 98890S (2016) https://doi.org/10.1117/12.2227920

KEYWORDS: Spectroscopy, Infrared spectroscopy, Tissue optics, Visible radiation, Infrared radiation, Spectrometer engineering, Point-of-care devices, Optical components, Infrared sensors, Infrared imaging, Tissue optics, Short wave infrared radiation, Tissues, Sensors, Mirrors, Signal to noise ratio, Diffraction gratings, Image segmentation

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Minimally-invasive image-guided procedures become increasingly used by physicians to obtain real-time characterization feedback from the tissue at the tip of their interventional device (needle, catheter, endoscopic or laparoscopic probes, etc…) which can significantly improve the outcome of diagnosis and treatment, and ultimately reduce cost of the medical treatment. Spectral tissue sensing using compact photonic probes has the potential to be a valuable tool for screening and diagnostic purposes, e.g. for discriminating between healthy and tumorous tissue. However, this technique requires a low-cost broadband miniature spectrometer so that it is commercially viable for screening at point-of-care locations such as physicians’ offices and outpatient centers. Our goal is therefore to develop a miniaturized spectrometer based on diffractive optics that combines the functionalities of a visible/near-infrared (VIS/NIR) and shortwave-infrared (SWIR) spectrometer in one very compact housing. A second goal is that the hardware can be produced in high volume at low cost without expensive time consuming alignment and calibration steps. We have designed a miniaturized spectrometer which operates both in the visible/near-infrared and shortwave-infrared wavelength regions ranging from 400 nm to 1700 nm. The visible/near-infrared part of the spectrometer is designed for wavelengths from 400 nm to 800 nm whereas the shortwave-infrared segment ranges from 850 nm to 1700 nm. The spectrometer has a resolution of 6 nm in the visible/near-infrared wavelength region and 10 nm in the shortwave-infrared. The minimum SNR of the spectrometer for the intended application is about 151 in the VIS/NIR range and 6000 for SWIR. In this paper, the modelling and design, and power budget analysis of the miniaturized spectrometer are presented. Our work opens a door for future affordable micro- spectrometers which can be integrated with smartphones and tablets, and used for point-of-care applications. As next steps in the development, we will manufacture the different optical components and experimentally characterize the spectrometer device in more detail.

Proceedings Article | 12 February 2009 Paper

Large-scale integrated optics using TriPleX waveguide technology: from UV to IR

René Heideman, Arne Leinse, Willem Hoving, Ronald Dekker, Douwe Geuzebroek, Edwin Klein, Remco Stoffer, Chris Roeloffzen, Leimeng Zhuang, Arjan Meijerink

Proceedings Volume 7221, 72210R (2009) https://doi.org/10.1117/12.808409

KEYWORDS: Waveguides, Integrated optics, Silica, Birefringence, Polarization, Photonics, Silicon, Phased array optics, Fiber couplers, Photonic integrated circuits

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Proceedings Article | 1 May 2008 Paper

Low loss, high contrast planar optical waveguides based on low-cost CMOS compatible LPCVD processing

Willem Hoving, Rene Heideman, Douwe Geuzebroek, Arne Leinse, Edwin Klein, Ronald Dekker

Proceedings Volume 6996, 699612 (2008) https://doi.org/10.1117/12.781700

KEYWORDS: Waveguides, Low pressure chemical vapor deposition, Silica, Birefringence, Photonics, Integrated optics, Signal attenuation, Silicon, Polarization, Switching

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Proceedings Article | 17 October 2003 Paper

Process spread reduction of laser microspot welding of thin copper parts using real-time control

Antoon Blom, Par Dunias, Piet van Engen, Willem Hoving, Janneke de Kramer

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.478612

KEYWORDS: Copper, Laser welding, Microelectronics, Reflectivity, Process control, Laser processing, Photonic microstructures, Photonics, Temperature metrology, Packaging

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Proceedings Article | 17 October 2003 Paper

Opportunities and challenges for laser technology in microelectronics and photonics

Willem Hoving

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.478607

KEYWORDS: Laser applications, Laser processing, Glasses, Microelectronics, Laser marking, Metals, Photonics, Laser welding, Manufacturing, Silicon

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Proceedings Article | 18 June 2002 Paper

Laser penetration spike welding: a welding tool enabling novel process and design opportunities

Durandus Dijken, Willem Hoving, J. Th. De Hosson

Proceedings Volume 4637, (2002) https://doi.org/10.1117/12.470670

KEYWORDS: Metals, Pulsed laser operation, Laser welding, Tolerancing, Plasma, Laser processing, High speed cameras, Epoxies, Ceramics, Laser applications

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Proceedings Article | 6 November 2000 Paper

Compact multisensor laser scanning head for processing and monitoring microspot welding

Moustapha Hafez, Karin Julliard, Sylvain Grossmann, Lino Olivetta, Thomas Sidler, Rene-Paul Salathe, Hans-Peter Schwob, Toon Blom, Willem Hoving

Proceedings Volume 4088, (2000) https://doi.org/10.1117/12.405717

KEYWORDS: Sensors, Head, Scanners, Laser scanners, Mirrors, Lens design, Laser welding, Optical fibers, Beam delivery, Pulsed laser operation

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Proceedings Article | 18 August 1997 Paper

Accurate manipulation using laser technology

Willem Hoving

Proceedings Volume 3097, (1997) https://doi.org/10.1117/12.281087

KEYWORDS: Actuators, Pulsed laser operation, Bridges, Metals, Laser applications, Laser welding, Head, High power lasers, Aluminum, Speckle pattern

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Showing 5 of 12 publications

SPIE Conference Volume | 8 March 2012

Laser-based Micro- and Nanopackaging and Assembly VI

SPIE Conference Volume | 21 February 2011

Laser-based Micro- and Nanopackaging and Assembly V

SPIE Conference Volume | 15 February 2010

Laser-based Micro- and Nanopackaging and Assembly IV

SPIE Conference Volume | 12 February 2009

Laser-based Micro- and Nanopackaging and Assembly III

SPIE Conference Volume | 18 February 2008

Laser-based Micro- and Nanopackaging and Assembly II

Showing 5 of 12 publications

Conference Committee Involvement (25)

Next-Generation Spectroscopic Technologies XVII

14 April 2025 | Orlando, Florida, United States

Next-Generation Spectroscopic Technologies XVI

22 April 2024 | National Harbor, Maryland, United States

Next-Generation Spectroscopic Technologies XV

1 May 2023 | Orlando, Florida, United States

Next-Generation Spectroscopic Technologies XIV

12 April 2021 | Online Only, Florida, United States

Next-Generation Spectroscopic Technologies XIII

27 April 2020 | Online Only, California, United States

Next-Generation Spectroscopic Technologies XII

15 April 2019 | Baltimore, MD, United States

Next-Generation Spectroscopic Technologies XI

16 April 2018 | Orlando, FL, United States

Next-Generation Spectroscopic Technologies X

10 April 2017 | Anaheim, CA, United States

Next-Generation Spectroscopic Technologies IX

18 April 2016 | Baltimore, MD, United States

Next-Generation Spectroscopic Technologies VIII

20 April 2015 | Baltimore, MD, United States

Laser-based Micro- and Nanopackaging and Assembly VI

25 January 2012 | San Francisco, California, United States

Laser-based Micro- and Nanopackaging and Assembly V

26 January 2011 | San Francisco, California, United States

Optoelectronic Interconnects and Component Integration XI

24 January 2011 | San Francisco, California, United States

Laser-based Micro- and Nanopackaging and Assembly IV

27 January 2010 | San Francisco, California, United States

Optoelectronic Interconnects and Component Integration X

25 January 2010 | San Francisco, California, United States

Laser-based Micro- and Nanopackaging and Assembly III

28 January 2009 | San Jose, California, United States

Photonics Packaging, Integration, and Interconnects IX

26 January 2009 | San Jose, California, United States

Laser-Based Micro- and Nano-Packaging and Assembly II

22 January 2008 | San Jose, California, United States

Laser-Based Micro- and Nano-Packaging and Assembly (LBMP-IV)

22 January 2007 | San Jose, California, United States

Laser-Based Micropackaging

25 January 2006 | San Jose, California, United States

Laser-Based Micro-Packaging II

27 January 2005 | San Jose, California, United States

Laser-Based Micro-Packaging

29 January 2004 | San Jose, Ca, United States

Laser-Based Packaging in Microelectronics and Photonics II

30 January 2003 | San Jose, CA, United States

Laser-Based Packaging in Microelectronics and Photonics

24 January 2002 | San Jose, California, United States

Photon Processing in Microelectronics and Photonics

21 January 2002 | San Jose, California, United States

Showing 5 of 25 Conference Committees

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