Mr. James A. Lott Profile

James A. Lott

Professor at Technical Univ Berlin

SPIE Involvement:

Conference Program Committee | Author

Publications (78)

Proceedings Article | 18 June 2024 Presentation

A high speed fully trainable laser-based neural network

Anas Skalli, Mirko Goldmann, Nasibeh Haghighi, Marcin Gebski, Stephan Reitzenstein, Tomasz Czyszanowski, James Lott, Daniel Brunner

Proceedings Volume PC13017, PC130170R (2024) https://doi.org/10.1117/12.3022442

KEYWORDS: Artificial neural networks, Vertical cavity surface emitting lasers, Education and training, Photonics, Online learning, Data processing, Power consumption, Parallel computing, Medical diagnostics, Excel

Read Abstract +

Proceedings Article | 13 March 2024 Paper

Comparison of 980 nm VCSELs with varying monolithic high index contrast grating top coupling mirror designs

Niels Heermeier, Marcin Gębski, Nasibeh Haghighi, Mikołaj Janczak, Martin Zorn, James Lott, Tomasz Czyszanowski, Stephan Reitzenstein

Proceedings Volume 12904, 129040H (2024) https://doi.org/10.1117/12.3007563

KEYWORDS: Vertical cavity surface emitting lasers, Optical gratings, Optical design, Oxides, Semiconducting wafers, Gallium arsenide, Mirrors, Quantum wells, Lithium, Emission wavelengths

Read Abstract +

Proceedings Article | 13 March 2024 Presentation

Observation of photon Bose-Einstein condensation in a VCSEL

Maciej Pieczarka, Marcin Gebski, Aleksandra Piasecka, James Lott, Axel Pelster, Michal Wasiak, Tomasz Czyszanowski

Proceedings Volume PC12904, PC1290407 (2024) https://doi.org/10.1117/12.3003251

KEYWORDS: Vertical cavity surface emitting lasers, Semiconductors, Ultrafast phenomena, Thermography, Thermodynamics, Thermal effects, Physics, Optical properties, Laser development, Data communications

Read Abstract +

Proceedings Article | 13 March 2024 Paper

VCSELs for free space links

Nasibeh Haghighi, Pouria Emtenani, Martin Zorn, James Lott

Proceedings Volume 12904, 1290403 (2024) https://doi.org/10.1117/12.3008001

KEYWORDS: Vertical cavity surface emitting lasers, Free space, Frequency response, Free space optics

Read Abstract +

Proceedings Article | 17 March 2023 Presentation

VCSELs for optical wireless communication

Nasibeh Haghighi, Weronika Glowadzka, Tomasz Czyszanowski, Denise Webb, Martin Zorn, John Joseph, James Lott

Proceedings Volume PC12439, PC1243903 (2023) https://doi.org/10.1117/12.2655695

KEYWORDS: Vertical cavity surface emitting lasers, Wireless communications, Free space optics, Wafer-level optics, Oxides, Standards development, Semiconducting wafers, Gallium arsenide, Free space, Connectors

Read Abstract +

Proceedings Article | 17 March 2023 Presentation

Impact of VCSEL array geometry on their performance

Marcin Gebski, Dominika Dabrowka, Marta Wieckowska, Patrycja Spiewak, Weronika Glowadzka, Robert Sarzala, Michal Wasiak, Rafal Pietruszka, Cezary Kobylecki, Iwona Pasternak, Walery Kolkowski, Wlodek Strupinski, James Lott, Tomasz Czyszanowski

Proceedings Volume PC12439, PC1243906 (2023) https://doi.org/10.1117/12.2652102

KEYWORDS: Vertical cavity surface emitting lasers, Optical components, Infrared radiation, Gallium arsenide, Distributed Bragg reflectors, Diffraction, Data communications, Computer simulations, Chemical elements

Read Abstract +

Proceedings Article | 17 March 2023 Presentation

Fully (implemented, scalable, and parallel) recurrent photonic neural networks in multimode semiconductor lasers

Anas Skalli, Xavier Porte, Nasibeh Haghighi, James Lott, Stephan Reitzenstein, Daniel Brunner

Proceedings Volume PC12438, PC124380G (2023) https://doi.org/10.1117/12.2650070

KEYWORDS: Neural networks, Semiconductor lasers, Neurons, Modes of laser operation, Diffusion, Diffraction, Data processing, Computing systems

Read Abstract +

Proceedings Article | 15 March 2023 Presentation + Paper

Coherent VCSEL homodyne neural networks

Zaijun Chen, Alexander Sludds, Ronald Davis, Ian Christen, Liane Bernstein, Tobias Heuser, Niels Heermeier, James Lott, Stephan Reitzenstein, Ryan Hamerly, Dirk Englund

Proceedings Volume 12438, 1243809 (2023) https://doi.org/10.1117/12.2648628

KEYWORDS: Vertical cavity surface emitting lasers, Neural networks, Homodyne detection, Optical computing, Matrices, Energy efficiency, Electro optics, Quantum processing, Quantum machine learning, Parallel computing

Read Abstract +

Proceedings Article | 4 October 2022 Presentation

Computational metrics of an injection-locked large area semiconductor laser for neural network computing (Conference Presentation)

Anas Skalli, Xavier Porte, Nasibeh Haghighi, Stephan Reitzenstein, James Lott, Daniel Brunner

Proceedings Volume PC12204, PC1220408 (2022) https://doi.org/10.1117/12.2633381

KEYWORDS: Semiconductor lasers, Neural networks, Computer networks, Vertical cavity surface emitting lasers, Complex systems, Energy efficiency, Data processing, Computing systems, Artificial neural networks, Analog electronics

Read Abstract +

Proceedings Article | 9 March 2022 Presentation

Emitted power enhancement of VCSELs by shape deformation of oxide aperture

Adam Brejnak, Marcin Gebski, Magdalena Marciniak, Mariusz Drong, Kamil Postava, Tibor Fördös, Michal Wasiak, Jan Muszalski, James Lott, Ingo Fischer, Tomasz Czyszanowski

Proceedings Volume PC12020, PC1202006 (2022) https://doi.org/10.1117/12.2610642

KEYWORDS: Vertical cavity surface emitting lasers, Oxides, Quantum efficiency, Structural engineering, Quantum electrodynamics, Optical resonators

Read Abstract +

Proceedings Article | 5 March 2022 Presentation

Tuning the reflectivity of a monolithic HCG mirror by modifying the spatial parameters

Magdalena Marciniak, Artur Broda, Marcin Gebski, Jan Muszalski, James Lott, Tomasz Czyszanowski

Proceedings Volume PC12010, PC120100I (2022) https://doi.org/10.1117/12.2610158

KEYWORDS: Mirrors, Reflectivity, Refractive index, Optoelectronics, Polarizers, Polarization, Optical lithography, Gallium arsenide, Etching

Read Abstract +

Proceedings Article | 1 August 2021 Presentation

A complete, parallel, and autonomous photonic neural network in a semiconductor multimode laser

Anas Skalli, Javier Porte, Nasibeh Haghighi, Stephan Reitzenstein, James Lott, Daniel Brunner

Proceedings Volume 11804, 1180406 (2021) https://doi.org/10.1117/12.2594646

KEYWORDS: Semiconductor lasers, Neural networks, Semiconductors, Data processing, Vertical cavity surface emitting lasers, Speech recognition, Multimode fibers, Micromirrors, Medical diagnostics, Excel

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Monolithic high-contrast gratings with various shapes of cross-section of stripes

Magdalena Marciniak, Artur Broda, Marcin Gębski, Jan Muszalski, Maciej Dems, James Lott, Tomasz Czyszanowski

Proceedings Volume 11695, 116950C (2021) https://doi.org/10.1117/12.2578467

KEYWORDS: Diffraction gratings, Reflectivity, Cladding, Refractive index, Semiconductors, Optoelectronics, Dielectrics

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Experimental demonstration of light focusing achieved by monolithic high-contrast grating mirrors

Paulina Komar, Marcin Gębski, James Lott, Tomasz Czyszanowski, Michał Wasiak

Proceedings Volume 11695, 116951Q (2021) https://doi.org/10.1117/12.2582505

KEYWORDS: Mirrors, Vertical cavity surface emitting lasers, Polishing, Optical microscopes, Light sources, Gold, Cameras

Read Abstract +

Proceedings Article | 5 March 2021 Presentation + Paper

19-element 2D honeycomb VCSEL array

Nasibeh Haghighi, Philip Moser, Martin Zorn, James Lott

Proceedings Volume 11704, 117040Q (2021) https://doi.org/10.1117/12.2576846

KEYWORDS: Free space optics, Vertical cavity surface emitting lasers, Optical communications, Atmospheric optics, Wireless communications, Stereoscopy, Speckle imaging, Speckle, Sensing systems

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Enhancing optical output power by breaking VCSEL circular symmetry

Tomasz Czyszanowski, Adam Brejnak, Marcin Gębski, Adam Sokół, Magdalena Marciniak, Emilia Pruszyńska-Karbownik, Michał Wasiak, Jan Muszalski, James Lott, Ingo Fischer

Proceedings Volume 11704, 117040D (2021) https://doi.org/10.1117/12.2578745

KEYWORDS: Vertical cavity surface emitting lasers, Quantum efficiency, Optoelectronic devices, Quantum electrodynamics, Oxides, Numerical simulations, Active optics, Absorbance

Read Abstract +

Proceedings Article | 10 March 2020 Presentation

Optimization of monolithic high-contrast gratings (Conference Presentation)

Magdalena Marciniak, Artur Broda, Marcin Gębski, Jan Muszalski, Michał Wasiak, Maciej Dems, James Lott, Tomasz Czyszanowski

Proceedings Volume 11290, 1129017 (2020) https://doi.org/10.1117/12.2547295

KEYWORDS: Diffraction gratings, Reflectivity, Refractive index, Mirrors, Etching, Vertical cavity surface emitting lasers, Oxidation, Gallium arsenide, Numerical simulations

Read Abstract +

Proceedings Article | 9 March 2020 Presentation

Impact of top mirror power reflectance on 980-nm VCSEL performance (Conference Presentation)

Magdalena Marciniak, Marcin Gebski, Artur Broda, Jan Muszalski, Tomasz Czyszanowski, James Lott

Proceedings Volume 11300, 113000Q (2020) https://doi.org/10.1117/12.2547300

KEYWORDS: Vertical cavity surface emitting lasers, Reflectivity, Mirrors, Oxides, Telecommunications, Modulation, Dielectrics, Optical communications, LIDAR, Sensing systems

Read Abstract +

Proceedings Article | 9 March 2020 Presentation

Progress in MHCG VCSELs (Conference Presentation)

Marcin Gebski, Majid Riaziat, Martin Zorn, James Lott, Tomasz Czyszanowski

Proceedings Volume 11300, 113000T (2020) https://doi.org/10.1117/12.2547328

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Distributed Bragg reflectors, Modulation

Read Abstract +

Proceedings Article | 24 February 2020 Paper

Comparison of 850 nm VCSEL oxide aperture designs

Niels Heermeier, Marcin Gębski, Nasibeh Haghighi, Philip Moser, Ping-Show Wong, Majid Riaziat, James Lott

Proceedings Volume 11300, 113000J (2020) https://doi.org/10.1117/12.2552196

KEYWORDS: Vertical cavity surface emitting lasers, Oxides, Optical resonators

Read Abstract +

Proceedings Article | 24 February 2020 Paper

20 and 40 Gbps data transmission with small VCSEL arrays

Nasibeh Haghighi, Philip Moser, Martin Zorn, James Lott

Proceedings Volume 11300, 113000E (2020) https://doi.org/10.1117/12.2547127

KEYWORDS: Oxides, Semiconducting wafers, Connectors, Metals, Optical testing, Integrated optics, Modulation

Read Abstract +

Proceedings Article | 11 April 2019 Presentation + Paper

Monolithic high-contrast gratings as highly reflective mirrors: optimization and fabrication

Magdalena Marciniak, Marcin Gębski, James Lott, Tomasz Czyszanowski

Proceedings Volume 10928, 1092819 (2019) https://doi.org/10.1117/12.2511043

KEYWORDS: Mirrors, Vertical cavity surface emitting lasers, Reflectivity, Refractive index, Electron beam lithography

Read Abstract +

Proceedings Article | 8 March 2019 Presentation

Control of transverse modes and thermal stability of vertical-cavity surface-emitting lasers incorporating monolithic high-contrast grating mirrors (Conference Presentation)

Marcin Gebski, Michal Wasiak, Magdalena Marciniak, Maciej Dems, James Lott, Tomasz Czyszanowski

Proceedings Volume 10928, 109281A (2019) https://doi.org/10.1117/12.2508671

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Refractive index, Gallium nitride, Gallium arsenide, Manufacturing, Indium, Microelectromechanical systems, Reflectivity, Oxides

Read Abstract +

Proceedings Article | 4 March 2019 Presentation

Electrically-injected VCSELs incorporating monolithic high-index contrast grating mirrors (Conference Presentation)

Marcin Gebski, Majid Riaziat, Martin Zorn, James Lott, Tomasz Czyszanowski

Proceedings Volume 10938, 1093808 (2019) https://doi.org/10.1117/12.2508654

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Gallium arsenide, LIDAR, Reflectivity, Ultraviolet radiation, Infrared radiation, Distributed Bragg reflectors, Free space, Facial recognition systems

Read Abstract +

Proceedings Article | 1 March 2019 Paper

Bandwidth and optical output power of VCSELs and VCSEL arrays

Nasibeh Haghighi, Philip Moser, James Lott

Proceedings Volume 10938, 1093804 (2019) https://doi.org/10.1117/12.2508720

KEYWORDS: Vertical cavity surface emitting lasers, Semiconductor lasers, Optical arrays

Read Abstract +

Proceedings Article | 9 May 2018 Paper

Validation of quasi-normal modes and of constant-flux modes for computing fundamental resonances of VCSELs

Theresa Hoehne, Lin Zschiedrich, Nasibeh Haghighi, James Lott, Sven Burger

Proceedings Volume 10682, 106821U (2018) https://doi.org/10.1117/12.2307200

KEYWORDS: Vertical cavity surface emitting lasers, Oxides, Finite element methods, Computer simulations, Near field optics, Maxwell's equations, 3D modeling

Read Abstract +

Proceedings Article | 19 February 2018 Paper

The influence of the VCSEL design on its electrical modulation properties

Paulina Komar, Patrycja Śpiewak, Marcin Gębski, Ricardo Rosales, Luca Sulmoni, Magdalena Marciniak, Tomasz Czyszanowski, James Lott, Michał Wasiak

Proceedings Volume 10552, 105520M (2018) https://doi.org/10.1117/12.2289582

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Oxides, Oxidation, Capacitance, Resistance, Eye, Picosecond phenomena, Solid state physics, Semiconductor lasers

Read Abstract +

Proceedings Article | 19 February 2018 Paper

Simplicity VCSELs

Nasibeh Haghighi, Ricardo Rosales, Gunter Larisch, Marcin Gębski, Leszek Frasunkiewicz, Tomasz Czyszanowski, James Lott

Proceedings Volume 10552, 105520N (2018) https://doi.org/10.1117/12.2295028

KEYWORDS: Vertical cavity surface emitting lasers, Semiconducting wafers, Modulation, Quantum efficiency, External quantum efficiency, Quantum wells

Read Abstract +

Proceedings Article | 19 February 2018 Paper

Impact of the top DBR in GaAs-based VCSELs on the threshold current and the cavity photon lifetime

Patrycja Śpiewak, Marcin Gębski, Nasibeh Haghighi, Ricardo Rosales, Paulina Komar, Jarosław Walczak, Marta Więckowska, Robert Sarzała, James Lott, Michał Wasiak

Proceedings Volume 10552, 105520O (2018) https://doi.org/10.1117/12.2289939

KEYWORDS: Vertical cavity surface emitting lasers, Quantum wells, Absorption, Laser damage threshold, Resistance, Oxides, Computer simulations, Optical simulations, Modulation

Read Abstract +

Proceedings Article | 19 February 2018 Paper

The vertical-cavity surface-emitting laser incorporating a high contrast grating mirror as a sensing device

Magdalena Marciniak, Marcin Gębski, Łukasz Piskorski, Maciej Dems, M. Wasiak, Krassimir Panajotov, James Lott, Tomasz Czyszanowski

Proceedings Volume 10552, 105520J (2018) https://doi.org/10.1117/12.2290729

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Optical sensing, Sensing systems, Semiconductor lasers, Optical components, Sensors, Absorption, Refractive index, Optical design

Read Abstract +

Proceedings Article | 28 February 2017 Paper

Reliability and manufacturability of 25G VCSELs with oxide apertures formed by in-situ monitoring

James Pao, Ta-Chung Wu, Wilson Kyi, Majid Riaziat, James Lott

Proceedings Volume 10115, 1011519 (2017) https://doi.org/10.1117/12.2253565

KEYWORDS: Oxidation, Vertical cavity surface emitting lasers, Reliability, Manufacturing, Oxides, Semiconducting wafers, Resistance, Process control, Atmospheric propagation, Semiconductors, Picosecond phenomena, Quantum wells, Oxygen

Read Abstract +

Proceedings Article | 25 February 2017 Presentation + Paper

Intracavity and extracavity-contacted 980-nm oxide-confined VCSELs for optical interconnects and integration

Philip Moser, Holger Schmeckebier, Marcin Gębski, Patrycja Śpiewak, Ricardo Rosales, Michał Wasiak, James Lott

Proceedings Volume 10122, 101220J (2017) https://doi.org/10.1117/12.2256177

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Optical interconnects, Semiconducting wafers, Resistance, Wafer-level optics, Metals, Oxides, Image processing, Doping

Read Abstract +

Proceedings Article | 25 February 2017 Paper

Modelling of the modulation properties of arsenide and nitride VCSELs

Michał Wasiak, Patrycja Śpiewak, Philip Moser, Marcin Gębski, Holger Schmeckebier, Robert Sarzała, James Lott

Proceedings Volume 10122, 101220A (2017) https://doi.org/10.1117/12.2253646

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Capacitance, Resistance, Modeling, Oxides, Photons, Capacitors, Picosecond phenomena, Gallium nitride

Read Abstract +

Proceedings Article | 25 February 2017 Presentation + Paper

Comparative study of contact geometry for bottom-emitting 980-nm VCSELs

R. Rosales, H. Schmeckebier, C. Boldt, P. Moser, M. Warren, R. Carson, J. Lott

Proceedings Volume 10122, 101220C (2017) https://doi.org/10.1117/12.2253361

KEYWORDS: Vertical cavity surface emitting lasers, Gallium arsenide, Resistance, Distributed Bragg reflectors, Metals, Semiconducting wafers, Modulation, Antireflective coatings, Quantum wells, Lithium

Read Abstract +

Proceedings Article | 25 February 2017 Presentation + Paper

Progress in optimization of high-power high-speed VCSEL arrays

James Rosprim, Li Wang, David Podva, Eric J. Martin, Preethi Dacha, Christopher Helms, Thomas Wilcox, Nein-Yi Li, Richard Carson, Mial Warren, James Lott

Proceedings Volume 10122, 1012205 (2017) https://doi.org/10.1117/12.2253142

KEYWORDS: Vertical cavity surface emitting lasers, Packaging, Thermal modeling, Finite element methods, Feature extraction, Performance modeling, Optimization (mathematics), Gallium arsenide, Gold, Modeling, LIDAR, Copper, Aluminum nitride, Safety, Fiber optic illuminators

Read Abstract +

Proceedings Article | 20 February 2017 Presentation + Paper

Optimization of VCSELs incorporating monolithic subwavelength high-refractive-index contrast surface grating mirrors

Marcin Gębski, Magdalena Marciniak, Maciej Dems, Tomasz Czyszanowski, James Lott

Proceedings Volume 10113, 101130E (2017) https://doi.org/10.1117/12.2253096

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Refractive index, Computer simulations, Active optics, Semiconductor lasers, Distributed Bragg reflectors, Reflectivity, Polarization, Manufacturing, Metals, Optical design, Resistance, Gold, Oxides, Gallium arsenide

Read Abstract +

Proceedings Article | 28 April 2016 Paper

Capacitance and modulation time constant in oxide-confined vertical-cavity surface-emitting lasers with different oxide layers

Michał Wasiak, Patrycja Śpiewak, Philip Moser, James Lott

Proceedings Volume 9892, 989211 (2016) https://doi.org/10.1117/12.2230312

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Capacitance, Optical resonators, Instrument modeling, Thermal modeling, Oxides, Gallium arsenide, Laser applications, Oxidation, Modulation, Systems modeling, Optical properties, Resistance, Electroluminescent displays, Capacitors

Read Abstract +

Proceedings Article | 18 March 2016 Paper

Progress in high-power high-speed VCSEL arrays

Richard Carson, Mial Warren, Preethi Dacha, Thomas Wilcox, John Maynard, David Abell, Kirk Otis, James Lott

Proceedings Volume 9766, 97660B (2016) https://doi.org/10.1117/12.2215009

KEYWORDS: Vertical cavity surface emitting lasers, LIDAR, Near infrared, Sensors, Fiber optic illuminators, Semiconductor lasers, Pulsed laser operation, Laser applications, Metals, Cameras

Read Abstract +

Proceedings Article | 4 March 2016 Paper

Monolithic subwavelength high refractive-index-contrast grating VCSELs

Marcin Gębski, Maciej Dems, James Lott, Tomasz Czyszanowski

Proceedings Volume 9766, 97660M (2016) https://doi.org/10.1117/12.2213637

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Laser resonators, Distributed Bragg reflectors, Numerical simulations, Semiconductors, Photonic crystals, Light sources, Active optics, Reflectivity, Oxides, Gallium arsenide, Refractive index, Etching, Optical design, Optical resonators

Read Abstract +