Mr. James A. Lott Profile

James A. Lott

Professor at Technical Univ Berlin

SPIE Involvement:

Conference Program Committee | Author

Publications (77)

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, Martin Zorn, James Lott, Stephan Reitzenstein, Tomasz Czyszanowski, Mikołaj Janczak, Nasibeh Haghighi

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

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Proceedings Article | 13 March 2024 Presentation

Observation of photon Bose-Einstein condensation in a VCSEL

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

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

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Proceedings Article | 13 March 2024 Paper

VCSELs for free space links

James Lott, Nasibeh Haghighi, Martin Zorn, Pouria Emtenani

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

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Proceedings Article | 17 March 2023 Presentation

VCSELs for optical wireless communication

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

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

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Proceedings Article | 17 March 2023 Presentation

Impact of VCSEL array geometry on their performance

Dominika Dabrowka, Marcin Gebski, 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

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Proceedings Article | 17 March 2023 Presentation

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

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

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

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Proceedings Article | 15 March 2023 Presentation + Paper

Coherent VCSEL homodyne neural networks

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

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

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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

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Proceedings Article | 9 March 2022 Presentation

Emitted power enhancement of VCSELs by shape deformation of oxide aperture

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

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

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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

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Proceedings Article | 1 August 2021 Presentation

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

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

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

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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

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Proceedings Article | 5 March 2021 Presentation + Paper

19-element 2D honeycomb VCSEL array

James Lott, Nasibeh Haghighi, Philip Moser, Martin Zorn

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

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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

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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

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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

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Proceedings Article | 9 March 2020 Presentation

Progress in MHCG VCSELs (Conference Presentation)

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

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

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

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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

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Proceedings Article | 24 February 2020 Paper

20 and 40 Gbps data transmission with small VCSEL arrays

James Lott, Nasibeh Haghighi, Philip Moser, Martin Zorn

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

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

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Proceedings Article | 24 February 2020 Paper

Comparison of 850 nm VCSEL oxide aperture designs

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

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

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

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Proceedings Article | 11 April 2019 Presentation + Paper

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

Magdalena Marciniak, Marcin Gębski, Tomasz Czyszanowski, James Lott

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

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

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

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Proceedings Article | 4 March 2019 Presentation

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

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

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

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Proceedings Article | 1 March 2019 Paper

Bandwidth and optical output power of VCSELs and VCSEL arrays

James Lott, Philip Moser, Nasibeh Haghighi

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

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

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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

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Proceedings Article | 19 February 2018 Paper

The influence of the VCSEL design on its electrical modulation properties

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

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

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Proceedings Article | 19 February 2018 Paper

Simplicity VCSELs

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

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

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

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

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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

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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

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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, Michał Wasiak, James Lott, Ricardo Rosales

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

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Proceedings Article | 25 February 2017 Paper

Modelling of the modulation properties of arsenide and nitride VCSELs

Michał Wasiak, Patrycja Śpiewak, Marcin Gębski, Philip Moser, 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

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Proceedings Article | 25 February 2017 Presentation + Paper

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

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

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

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Proceedings Article | 25 February 2017 Presentation + Paper

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

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

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Proceedings Article | 20 February 2017 Presentation + Paper

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

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

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

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Proceedings Article | 28 April 2016 Paper

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

James Lott, Michał Wasiak, Patrycja Śpiewak, Philip Moser

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

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Proceedings Article | 18 March 2016 Paper

Progress in high-power high-speed VCSEL arrays

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

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

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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

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