Dr. Alexander N. Cartwright Profile

Dr. Alexander N. Cartwright

President at Univ of Central Florida

SPIE Involvement:

Author | Editor

Publications (31)

Proceedings Article | 4 March 2019 Presentation + Paper

Coulomb-induced recombination dynamics in magnetically doped type-IIb quantum dots

S. Tarasek, W.-C. Chou, W. C. Fan, A. Cartwright, T. Thomay

Proceedings Volume 10929, 109290I (2019) https://doi.org/10.1117/12.2507292

KEYWORDS: Magnetism, Quantum dots, Polarons, Excitons, Doping, Ions, Manganese, Luminescence, Electrons, Magnetic semiconductors

Read Abstract +

Proceedings Article | 22 February 2018 Paper

Using resistive readout to probe ultrafast dynamics of a plasmonic sensor

Alec Cheney, Borui Chen, Alexander Cartwright, Tim Thomay

Proceedings Volume 10530, 105300E (2018) https://doi.org/10.1117/12.2289249

KEYWORDS: Plasmonics, Polarization, Scattering, Aluminum, Metals, Gold, Beam splitters, Resistance, Ultrafast phenomena, Surface plasmons

Read Abstract +

Proceedings Article | 20 February 2018 Paper

Novel plasmonic polarimeter for biomedical imaging applications

Alec Cheney, Borui Chen, Alexander Cartwright, Tim Thomay

Proceedings Volume 10506, 105060U (2018) https://doi.org/10.1117/12.2290563

KEYWORDS: Polarization, Plasmonics, Surface plasmons, Sensors, Resistance, Metals, Absorption, Gold, Polarimetry, Plasmons

Read Abstract +

Proceedings Article | 22 February 2017 Presentation + Paper

Plasmoelectronic sensor for real-time on-chip wavelength selective biosensing

Alec Cheney, Borui Chen, Tianmu Zhang, Tim Thomay, Alexander Cartwright

Proceedings Volume 10077, 1007704 (2017) https://doi.org/10.1117/12.2252176

KEYWORDS: Sensors, Metals, Plasmonics, Light scattering, Biosensing, Biosensors, Nanostructures, Surface plasmons, Electrons, Scattering, Absorption, Polarization, Beam splitters, Ultrafast phenomena, Optical amplifiers, Proteins

Read Abstract +

Proceedings Article | 20 February 2017 Presentation + Paper

Time resolved photoluminescence study of magnetic CdSe/CdMnS/CdS core/multi-shell nanoplatelets

Joseph Murphy, Savas Delikanli, Tianmu Zhang, Thomas Scrace, Peiyao Zhang, Tenzin Norden, Tim Thomay, Alexander Cartwright, Hilmi Volkan Demir, Athos Petrou

Proceedings Volume 10114, 101140R (2017) https://doi.org/10.1117/12.2252266

KEYWORDS: Luminescence, Magnetism, Nanolithography, Magnetic semiconductors, Semiconductors, Polarization, Manganese, Cadmium sulfide, Electrons, Lab on a chip, Heterojunctions

Read Abstract +

Proceedings Article | 27 January 2017 Presentation + Paper

Using plasmon-induced resistance changes in a tunable metal grating for all-electronic readout

Borui Chen, Alec Cheney, Tianmu Zhang, Tim Thomay, Alexander Cartwright

Proceedings Volume 10111, 101111Q (2017) https://doi.org/10.1117/12.2252158

KEYWORDS: Metals, Plasmonics, Resistance, Scattering, Plasmons, Polarization, Surface plasmons, Sensors, Absorption, Mirrors

Read Abstract +

Proceedings Article | 4 November 2016 Presentation + Paper

Magneto-optical studies of CdSe/CdMnS/CdS core/multi-shell colloidal nanoplatelets

Athos Petrou, Thomas Scrace, Joseph Murphy, Peiyao Zhang, Tenzin Norden, Tianmu Zhang, Tim Thomay, Alexander Cartwright, Savas Delikanli, Mehmet Zafer Akgul, Himli Volkan Demir

Proceedings Volume 9931, 99311W (2016) https://doi.org/10.1117/12.2239725

KEYWORDS: Magnetism, Luminescence, Nanolithography, Polarization, Ions, Cadmium sulfide, Neodymium, Transmission electron microscopy, Toxic industrial chemicals, Cadmium

Read Abstract +

Proceedings Article | 28 August 2014 Paper

Conventional versus unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots

B. Barman, Y. Tsai, T. Scrace, J. Murphy, A. Cartwright, J. Pientka, I. Zutic, B. McCombe, A. Petrou, I. Sellers, R. Oszwaldowski, A. Petukhov, W. C. Fan, W. C. Chou, C. S. Yang

Proceedings Volume 9167, 91670L (2014) https://doi.org/10.1117/12.2064339

KEYWORDS: Magnetism, Polarons, Quantum dots, Manganese, Electrons, Ions, Spectroscopy, Luminescence, Time resolved spectroscopy, Streak cameras

Read Abstract +

Proceedings Article | 6 March 2013 Paper

Image acquisition, geometric correction and display of images from a 2x2 x-ray detector array based on electron multiplying charge coupled device (EMCCD) technology

S. N. Swetadri Vasan, P. Sharma, Ciprian Ionita, A. Titus, A. Cartwright, D. Bednarek, S. Rudin

Proceedings Volume 8668, 86685J (2013) https://doi.org/10.1117/12.2006280

KEYWORDS: Sensors, Electron multiplying charge coupled devices, Cameras, Fiber optics, Fiber optics sensors, Image sensors, Image acquisition, X-ray detectors, Detector arrays, Image storage

Read Abstract +

Proceedings Article | 6 March 2013 Paper

Quantitative analysis of an enlarged area solid state x-ray image intensifier (SSXII) detector based on electron multiplying charge coupled device (EMCCD) technology

Setlur Nagesh Swetadri Vasan, P. Sharma, V. Singh, A. Jain, Ciprian Ionita, A. Titus, A. Cartwright, D. Bednarek, S. Rudin

Proceedings Volume 8668, 86680J (2013) https://doi.org/10.1117/12.2006286

KEYWORDS: Sensors, Electron multiplying charge coupled devices, Modulation transfer functions, Fiber optics, X-rays, Fiber optics sensors, Cameras, Signal to noise ratio, Quantitative analysis, X-ray detectors

Read Abstract +

Proceedings Article | 9 March 2012 Paper

Dose reduction technique using a combination of a region of interest (ROI) material x-ray attenuator and spatially different temporal filtering for fluoroscopic interventions

S. Swetadri Vasan, A. Panse, A. Jain, P. Sharma, Ciprian Ionita, A. Titus, A. Cartwright, D. Bednarek, S. Rudin

Proceedings Volume 8313, 831357 (2012) https://doi.org/10.1117/12.910945

KEYWORDS: Image filtering, Attenuators, X-rays, Signal attenuation, Temporal resolution, Sensors, Fluoroscopy, X-ray imaging, Image processing, Digital filtering

Read Abstract +

Proceedings Article | 3 March 2012 Paper

Two dimensional extensible array configuration for EMCCD-based solid state x-ray detectors

P. Sharma, S. Swetadri Vasan, A. Cartwright, A. Titus, D. Bednarek, S. Rudin

Proceedings Volume 8313, 83135A (2012) https://doi.org/10.1117/12.911354

KEYWORDS: Electron multiplying charge coupled devices, Sensors, Clocks, Field programmable gate arrays, X-ray detectors, Fiber optics, Photons, X-rays, Solid state electronics, CCD image sensors

Read Abstract +

Proceedings Article | 24 February 2012 Paper

Graphics processing unit (GPU) implementation of image processing algorithms to improve system performance of the control acquisition, processing, and image display system (CAPIDS) of the micro-angiographic fluoroscope (MAF)

S. Swetadri Vasan, Ciprian Ionita, A. Titus, A. Cartwright, D. Bednarek, S. Rudin

Proceedings Volume 8313, 83134C (2012) https://doi.org/10.1117/12.911272

KEYWORDS: Image processing, Image filtering, Image display, Image acquisition, Fluoroscopy, Surgery, GPU based image processing, Graphics processing units, Process control, Control systems

Read Abstract +

Proceedings Article | 17 September 2011 Paper

Optical properties of DNA-CTMA biopolymers and applications in metal-biopolymer-metal photodetectors

Bin Zhou, Sung Jin Kim, Carrie Bartsch, Emily Heckman, Fahima Ouchen, Alexander Cartwright

Proceedings Volume 8103, 810308 (2011) https://doi.org/10.1117/12.892857

KEYWORDS: Ultraviolet radiation, Luminescence, Photodetectors, Biopolymers, Absorbance, Thin films, Optical properties, Nitrogen, Streak cameras, Applied physics

Read Abstract +

SPIE Journal Paper | 1 July 2010

Porous silicon and porous polymer substrates for optical chemical sensors

Mohamad Hajj-Hassan, Sung Jin Kim, Maurice Cheung, Lei Yao, Vamsy Chodavarapu, Alexander Cartwright

JNP, Vol. 4, Issue 01, 043513, (July 2010) https://doi.org/10.1117/12.10.1117/1.3472237

KEYWORDS: Silicon, Polymers, Sensors, Oxygen, Etching, Reflection, Polymeric sensors, Luminescence, Scanning electron microscopy, Reflectivity

Read Abstract +

Proceedings Article | 13 February 2010 Paper

Neuromorphic optical sensor chip with color change-intensity change disambiguation

ZhenHong Fu, Rui Mao, Alexander Cartwright, Albert Titus

Proceedings Volume 7574, 75740S (2010) https://doi.org/10.1117/12.851044

KEYWORDS: Sensors, Retina, Photodiodes, Photodetectors, Optical sensors, CMOS sensors, Amplifiers, Image quality, Diodes, Optical amplifiers

Read Abstract +

Proceedings Article | 16 February 2009 Paper

Enabling intelligent readout of luminescent signals from nanoscale biochemical sensors

Lei Yao, Ka Yi Yung, Vijay Tripathi, Vamsy Chodavarapu, Alexander Cartwright, Frank Bright

Proceedings Volume 7188, 71880E (2009) https://doi.org/10.1117/12.816026

KEYWORDS: Sensors, Luminescence, CMOS sensors, Signal processing, Oxygen, Imaging systems, Signal detection, Digital electronics, Intelligent sensors, Phototransistors

Read Abstract +

The development of intelligent miniaturized biochemical sensors has been an area of active research over the past several years. These microsensors and sensor microarrays are finding niche applications in point-of-care diagnostics, personal care, food safety, and environmental monitoring. Among these sensors, optical (luminescence) sensing holds a great promise towards implementing simple, specific, and highly sensitive biochemical sensors. It is generally understood that biochemical recognition elements that respond specifically to the target analytes play a critical role in the overall sensor operation. Aside from the recognition elements, signal detection and processing components are important to collect the information provided by recognition elements and output an easily understandable response. The signal processing component provides the best opportunity to incorporate intelligence to achieve low-power, adaptive, accurate, and reliable sensors. We deal with sensors that use sol-gel derived xerogels as recognition materials and Complementary Metal-Oxide Semiconductor (CMOS) integrated circuits for signal detection and processing. Xerogels are nano/microporous glasses that can be used to encapsulate luminophores, enzymes, and nanoparticles in their pores. In this Article, we will describe some of the emerging integrated sensor platforms that are based on monitoring the excited-state luminescence intensity and lifetimes of the luminophores housed in the xerogels. Specifically, we describe a CMOS imaging system for simultaneously monitoring xerogels sensor arrays. Next, we describe a non-linear phase luminometric system with enhanced and dynamically tunable sensitivity and improved signal-to-noise performance. Finally, we will describe time-based signal processing that could enable the direct measurement of excited state fluorescence lifetimes. This time-to-digital converter requires simple circuit implementation and can be used to measure lifetimes that are on the order of several hundred nanoseconds. The time based signal processing could ultimately allow the development of low-cost lifetime imaging system wherein one could take the lifetimes' image of an array of recognition elements rather than collecting an image of their fluorescence intensities.

Proceedings Article | 11 September 2008 Paper

Tandem inorganic/organic hybrid solar cell using a PbSe nanocrystal photoconductor for carrier multiplication

Sung Jin Kim, Won Jin Kim, Alexander Cartwright, Paras Prasad

Proceedings Volume 7047, 70470O (2008) https://doi.org/10.1117/12.796111

KEYWORDS: Nanocrystals, Photoresistors, Ultraviolet radiation, Polymers, Solar cells, Absorption, Quantum dots, Quantum efficiency, Solar energy, Control systems

Read Abstract +

Proceedings Article | 14 February 2008 Paper

Ultrafast time-resolved photoluminescence of Zn-Se-Te multilayers with type-II ZnTe/ZnSe quantum dots

Maurice C-K. Cheung, Ian Sellers, Igor Kuskovsky, Alexander Cartwright, Bruce McCombe

Proceedings Volume 6892, 68921A (2008) https://doi.org/10.1117/12.764112

KEYWORDS: Luminescence, Quantum dots, Excitons, Superlattices, Ultrafast phenomena, Streak cameras, Imaging systems, Statistical analysis, Deconvolution, Physics

Read Abstract +

Proceedings Article | 12 February 2007 Paper

Nanostructured porous polymeric photonic bandgap structures for sensing

Sung Jin Kim, Vamsy Chodavarapu, Rachel Bukowski, A. Titus, Alexander Cartwright, Mark Swihart, Frank Bright, Timothy Bunning

Proceedings Volume 6447, 64470O (2007) https://doi.org/10.1117/12.716666

KEYWORDS: Sensors, Polymers, Chemical elements, Oxygen, Luminescence, Polymeric sensors, Structural sensing, Reflection, Glucose, Optical sensors

Read Abstract +

Proceedings Article | 31 August 2006 Paper

Reduction of metal linewidths through a combination of low-temperature and ultrasonic development of poly(methylmethacrylate) using electron-beam lithography

Zhou Lu, A. Cartwright

Proceedings Volume 6327, 63270O (2006) https://doi.org/10.1117/12.681353

KEYWORDS: Ultrasonics, Polymethylmethacrylate, Metals, Electron beam lithography, Lithography, Chromium, Nanolithography, Electronic components, Scattering, Scanning electron microscopy

Read Abstract +

Proceedings Article | 30 August 2006 Paper

Tunable porous photonic bandgap structures for chemical and biological sensing

Sung Jin Kim, Vamsy Chodavarapu, Firdous Kamal, Vincent Hsiao, Alexander Cartwright, Mark Swihart, Paras Prasad, Timothy Bunning

Proceedings Volume 6322, 632201 (2006) https://doi.org/10.1117/12.681356

KEYWORDS: Polymers, Sensors, Reflection, Liquid crystals, Holography, Chemical elements, Luminescence, Glasses, Silicon, Prisms

Read Abstract +

Proceedings Article | 28 February 2006 Paper

CMOS-based biosensor systems using integrated nanostructured recognition elements

Vamsy Chodavarapu, Daniil Shubin, Rachel Bukowski, Elizabeth Tehan, Albert Titus, Alexander Cartwright, Frank Bright

Proceedings Volume 6095, 60950O (2006) https://doi.org/10.1117/12.649907

KEYWORDS: Sensors, CMOS sensors, Glucose, Luminescence, Light emitting diodes, Microsystems, Nanostructuring, Signal detection, Phase shifts, Phase measurement

Read Abstract +

Proceedings Article | 12 October 2005 Paper

Biomolecule-less sensors for biomolecules based on templated xerogel platforms

Zunyu Tao, Elizabeth Tehan, Rachel Bukowski, Ying Tang, Ellen Shughart, William Holthoff, Alexander Cartwright, Albert Titus, Frank Bright

Proceedings Volume 5969, 59690F (2005) https://doi.org/10.1117/12.629169

KEYWORDS: Proteins, Sensors, Chemical elements, Polymers, Biological research, Plasma, Molecules, Chemical analysis, Biosensors, Luminescence

Read Abstract +

Proceedings Article | 15 September 2005 Paper

Deep green emission at 570nm from InGaN/GaN MQW active region grown on bulk AlN substrate

F. Shahedipour-Sandvik, J. Grandusky, M. Jamil, V. Jindal, S. Schujman, L. Schowalter, R. Liu, F. Ponce, M. Cheung, A. Cartwright

Proceedings Volume 5941, 594107 (2005) https://doi.org/10.1117/12.617829

KEYWORDS: Aluminum nitride, Indium gallium nitride, Sapphire, Luminescence, Transmission electron microscopy, Gallium nitride, Diffraction, Crystals, Quantum wells, Optical spectroscopy

Read Abstract +

Proceedings Article | 13 September 2005 Paper

Organic solvent vapor sensing using porous photopolymer photonic bandgap structures

Vincent Hsiao, William Kirkey, Alexander Cartwright, Paras Prasad, Pamela Lloyd, Timothy Bunning

Proceedings Volume 5926, 59260K (2005) https://doi.org/10.1117/12.619262

KEYWORDS: Polymers, Glasses, Reflection, Liquid crystals, Refractive index, Holography, Polymer thin films, Silicon, Sensors, Reflectivity

Read Abstract +

SPIE Journal Paper | 1 May 2004

Experimental verification of improvement of phase shifting moiré interferometry using wavelet-based image processing

Heng Liu, Alexander Cartwright, Cemal Basaran

OE, Vol. 43, Issue 05, (May 2004) https://doi.org/10.1117/12.10.1117/1.1690281

KEYWORDS: Continuous wavelet transforms, Diffraction gratings, Phase shifting, Deflectometry, Discrete wavelet transforms, Wavelets, Image processing, Phase shifts, Packaging, Fringe analysis

Read Abstract +

Proceedings Article | 14 November 2003 Paper

Ultrafast dynamics in nanostructured materials

Alexander Cartwright, William Kirkey, Madalina Furis, Xuegeng Li, Yuanqing He, David MacRae, Yudhisthira Sahoo, Mark Swihart, Paras Prasad

Proceedings Volume 5222, (2003) https://doi.org/10.1117/12.509341

KEYWORDS: Nanoparticles, Silicon, Luminescence, Polymers, Etching, Indium, Visible radiation, Electroluminescence, Nanostructuring, Spectroscopy

Read Abstract +

Proceedings Article | 14 November 2003 Paper

High-rate synthesis and characterization of brightly luminescent silicon nanoparticles with applications in hybrid materials for photonics and biophotonics

Mark Swihart, Xuegeng Li, Yuanqing He, William Kirkey, Alexander Cartwright, Yudhisthira Sahoo, Paras Prasad

Proceedings Volume 5222, (2003) https://doi.org/10.1117/12.509337

KEYWORDS: Silicon, Particles, Nanoparticles, Atmospheric particles, Luminescence, Etching, Photonics, Polymers, Biomedical optics, Gas lasers

Read Abstract +

This presentation focuses on the synthesis and characterization of luminescent silicon nanoparticles that have potential as components of hybrid inorganic/organic materials for photonic and biophotonic applications. In our lab, silicon nanoparticles with bright visible photoluminescence are being prepared by a new combined vapor-phase and solution-phase process, using only inexpensive commodity chemicals. CO₂ laser-induced pyrolysis of silane is used to produce Si nanoparticles at high rates (20 to 200 mg/hour). Particles with an average diameter as small as 5 nm can be prepared directly by this method. Etching these particles with mixtures of hydrofluoric acid (HF) and nitric acid (HNO₃) reduces the size and passivates the surface of these particles such that they exhibit bright visible luminescence at room temperature. The wavelength of maximum photoluminescence (PL) intensity can be controlled from above 800 nm to below 500 nm by controlling the etching time and conditions. Particles with blue and green emission are prepared by rapid thermal oxidation of orange-emitting particles. These particles have exciting potential applications in optoelectronics, display technology, chemical sensing, biological imaging, and other areas. The availability of relatively large quantities of these particles is allowing us to begin to functionalize particles for these applications, as well as to study the optical, electronic, and surface chemical properties of them. All of these potential applications require inorganic/organic hybrid materials, in the sense that the nanoparticles must have their surfaces coated with organic molecules that mediate the interaction of the particles with the polymeric or biological host matrix. The particle synthesis methods, photoluminescence measurements on the particles, the stability of the photoluminescence properties with time, chemical quenching of photoluminescence, and functionalization of the particles for incorporation into different organic matrices or for specific interaction with small molecules or biomolecules are discussed in the context of applications to photonics and biophotonics.

SPIE Journal Paper | 1 September 2003

Sensitivity improvement in phase-shifted moiré interferometry using 1-D continuous wavelet transform image processing

Heng Liu, Alexander Cartwright, Cemal Basaran

OE, Vol. 42, Issue 09, (September 2003) https://doi.org/10.1117/12.10.1117/1.1592803

KEYWORDS: Continuous wavelet transforms, Deflectometry, Phase shifts, Signal to noise ratio, Bandpass filters, Phase interferometry, Image processing, Electronics, Interferometry, Wavelets

Proceedings Article | 4 December 1998 Paper

Photo-degradation in II-VI heterostructures using n-i-n photoconductors

Alexander Cartwright, Sundari Nagarathnam, E. Lee, H. Luo

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328679

KEYWORDS: Photoresistors, Luminescence, Quantum wells, Heterojunctions, Temperature metrology, Gallium arsenide, Monochromators, Selenium, Sapphire lasers, Gold

Read Abstract +

Showing 5 of 31 publications

Proceedings Volume Editor (16)

SPIE Conference Volume | 21 May 2018

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XV

SPIE Conference Volume | 2 May 2017

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV

SPIE Conference Volume | 24 June 2016

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIII

SPIE Conference Volume | 3 April 2015

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XII

SPIE Conference Volume | 11 March 2014

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XI

Showing 5 of 16 publications

Conference Committee Involvement (19)

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XV

30 January 2018 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV

30 January 2017 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIII

16 February 2016 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XII

10 February 2015 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XI

4 February 2014 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications X

6 February 2013 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications IX

25 January 2012 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII

26 January 2011 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VII

25 January 2010 | San Francisco, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VI

27 January 2009 | San Jose, California, United States

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications V

21 January 2008 | San Jose, California, United States

Nanoscale Imaging, Spectroscopy, Sensing and Actuation for Biomedical Applications IV

23 January 2007 | San Jose, California, United States

Nano/Biophotonics and Biomedical Applications III

23 January 2006 | San Jose, California, United States

Ultrafast Phenomena in Semiconductors and Nanostructure Materials X

23 January 2006 | San Jose, California, United States

Nano/Biophotonics and Biomedical Applications

24 January 2005 | San Jose, CA, United States

Nano-Biophotonics and Biomedical Applications

26 January 2004 | San Jose, CA, United States

Organic and Hybrid Materials for Nanophotonics

4 August 2003 | San Diego, California, United States

All-Player Conference

10 April 2001 | Rochester, NY, United States

Optoelectronics and Photonic Devices

9 April 2001 | Rochester, NY, United States

Showing 5 of 19 Conference Committees

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years