Dr. Robert B. Kohlhaas Profile

Dr. Robert B. Kohlhaas

at Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Instit

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Author

Publications (17)

Proceedings Article | 18 June 2024 Presentation + Paper

High conversion efficiency photonic THz mixers based on iron-doped InGaAs embedded in a plasmonic microcavity

Victor Merupo, Charbel Tannoury, G. Di Gioia, David Troadec, Yves Deblock, Steffen Breuer, Robert Kohlhaas, Emilien Peytavit

Proceedings Volume 12994, 1299405 (2024) https://doi.org/10.1117/12.3015920

KEYWORDS: Terahertz radiation, Indium gallium arsenide, Plasmonics, Optical microcavities, Absorption, Photoresistors, Palladium, Ultrafast phenomena, Receivers, Optoelectronics

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Proceedings Article | 18 June 2024 Presentation

Inspection of electrodes in battery production using a multi-channel photonic terahertz radar

Shiva Mohammadzadeh, Andreas Keil, Raphael Hussung, Lauri Maximilian Schwenson, Lars Liebermeister, Robert Kohlhaas, Fabian Friederich

Proceedings Volume PC12994, PC129940G (2024) https://doi.org/10.1117/12.3017467

KEYWORDS: Electrodes, Radar, Inspection, Batteries, Film thickness, Laser frequency, Imaging arrays, Electrical conductivity, Transmitters, Tissue optics

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Proceedings Article | 18 June 2024 Presentation

Advances in coherent optoelectronic cw-THz spectroscopy

Lars Liebermeister, Lauri Schwenson, Milan Deumer, Konstantin Wenzel, Florian Walter, Steffen Breuer, Simon Nellen, Sebastian Lauck, Cornelius Mach, Alexander Jäckel, Enrique Castro-Camus, Martin Koch, Martin Schell, Robert Kohlhaas

Proceedings Volume PC12994, PC129940D (2024) https://doi.org/10.1117/12.3016918

KEYWORDS: Spectroscopy, Terahertz radiation, Optoelectronics, Receivers, Photonic integrated circuits, Integrated optics, Wireless communications, Waveguides, Ultrafast phenomena, Terahertz spectroscopy

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Proceedings Article | 11 March 2024 Presentation + Paper

cw-THz receivers based on rhodium-doped InGaAs with 125 dB peak dynamic range

Milan Deumer, Steffen Breuer, Shahram Keyvaninia, Alexander Dohms, Simon Nellen, Chris Nguyen, Lars Liebermeister, Martin Schell, Robert Kohlhaas

Proceedings Volume 12885, 1288505 (2024) https://doi.org/10.1117/12.3003109

KEYWORDS: Terahertz radiation, Receivers, Indium gallium arsenide, Rhodium, Epitaxy, Continuous wave operation

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Proceedings Article | 11 March 2024 Presentation + Paper

Ultra-stable tunable THz generation based on frequency comb technology

Thomas Puppe, Taro Eichler, Sebastian Müller, Timo Noack, Milan Deumer, Simon Nellen, Yuriy Mayzlin, Nico Riedmann, Andreas Brodschelm, Lars Liebermeister, Rafal Wilk, Robert Kohlhaas, Nico Vieweg, Gerd Hechtfischer, Wilhelm Keusgen

Proceedings Volume 12885, 128850H (2024) https://doi.org/10.1117/12.3003859

KEYWORDS: Terahertz radiation, Photonics, Frequency combs, Signal generators, Phase measurement, Statistical analysis, Communication technologies

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Proceedings Article | 11 March 2024 Presentation + Paper

Fiber-coupled terahertz time-domain spectrometer with 10 THz bandwidth using InGaAs photoconductive membranes on silicon

A. Dohms, S. Keyvaninia, M. Gruner, S. Breuer, S. Nellen, L. Liebermeister, M. Schell, R. Kohlhaas

Proceedings Volume 12885, 1288503 (2024) https://doi.org/10.1117/12.3003030

KEYWORDS: Terahertz radiation, Indium gallium arsenide, Antennas, Silicon, Spectroscopy, Principal component analysis, Absorption, Receivers, Transmittance, Photoresistors

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Proceedings Article | 11 March 2024 Presentation + Paper

Dispersive mirrors for phase delay variation in THz-homodyne systems

Lisa Kreuzer, Nils Surkamp, Niklas Schulz, Valentin Wittwer, Martin Hoffmann, Thomas Südmeyer, Carsten Brenner, Milan Deumer, Robert Kohlhaas, Martin Hofmann

Proceedings Volume 12885, 128850Q (2024) https://doi.org/10.1117/12.2692885

KEYWORDS: Mirrors, Terahertz radiation, Laser frequency, Phase shifts, Phase shift keying, Phase modulation, Homodyne detection, Phase recovery, Data acquisition

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Proceedings Article | 15 March 2023 Presentation + Paper

Photonic integrated circuits for 5G-and-beyond networks: enabling the mmWave band and beyond with InP-based photomixers in integrated transceivers

Efstathios Andrianopoulos, Milan Deumer, Tianwen Qian, Nikolaos Lyras, Simon Nellen, Evangelos Pikasis, Georgia Ntouni, Eleftherios Loghis, Elias Tsirbas, David de Felipe, Panos Groumas, Christos Tsokos, Maria Massaouti, Christos Kouloumentas, Dimitrios Kritharidis, Robert Kohlhaas, Norbert Keil, Martin Schell, Hercules Avramopoulos

Proceedings Volume 12429, 1242904 (2023) https://doi.org/10.1117/12.2648079

KEYWORDS: Terahertz radiation, Receivers, Principal component analysis, Photonic integrated circuits, Signal detection, Waveguides

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Proceedings Article | 13 March 2023 Presentation + Paper

Purely photonic wireless link at 120 GHz carrier frequency enabled by heterodyne detection with a photoconductive antenna

Milan Deumer, Oliver Stiewe, Simon Nellen, Robert Kohlhaas, Robert Elschner, Colja Schubert, Ronald Freund, Martin Schell

Proceedings Volume 12420, 1242005 (2023) https://doi.org/10.1117/12.2649256

KEYWORDS: Receivers, Terahertz radiation, Heterodyning, Antennas, Data transmission, Wireless communications, Waveguides, PIN photodiodes

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Proceedings Article | 13 March 2023 Presentation

Rapid THz-TDS enabled by single-cavity solid-state GHz dual-comb oscillator

Benjamin Willenberg, Christopher Phillips, Justinas Pupeikis, Lars Liebermeister, Robert Kohlhaas, Björn Globisch, Ursula Keller

Proceedings Volume PC12420, PC1242006 (2023) https://doi.org/10.1117/12.2650093

KEYWORDS: Terahertz radiation, Oscillators, Solid state physics, Receivers, Absorption, Visibility, Spectroscopy, Spectral resolution, Solid state lasers, Nondestructive evaluation

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Proceedings Article | 7 March 2022 Presentation + Paper

THz generation with photoconductive emitters with a low-noise GHz repetition rate laser

F. Fobbe, T. Vogel, R. Kohlhaas, F. Wulf, B. Globisch, M. van Delden, B. Rudin, F. Emaury, T. Musch, C. Saraceno

Proceedings Volume 12000, 120000A (2022) https://doi.org/10.1117/12.2608618

KEYWORDS: Receivers, Terahertz radiation, Time metrology, Antennas, Amplifiers, Laser beam diagnostics, Femtosecond phenomena, Modulation, Laser sources, Indium gallium arsenide

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Proceedings Article | 5 March 2021 Presentation

Novel photoconductive antennas based on rhodium doped InGaAs with 637 µW emitted THz power

Robert Kohlhaas, Steffen Breuer, Lars Liebermeister, Simon Nellen, Milan Deumer, Martin Schell, Björn Globisch

Proceedings Volume 11685, 116851K (2021) https://doi.org/10.1117/12.2582964

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Proceedings Article | 10 March 2020 Presentation

Next-generation photo-conductive THz devices for 1550nm excitation (Conference Presentation)

Björn Globisch, Robert Kohlhaas, Steffen Breuer, Lars Liebermeister, Simon Nellen, Martin Schell

Proceedings Volume 11279, 1127911 (2020) https://doi.org/10.1117/12.2546113

KEYWORDS: Terahertz radiation, Antennas, Terahertz spectroscopy, Iron, Transceivers, Spectroscopes, Indium gallium arsenide, Molecular beam epitaxy, Receivers

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Proceedings Article | 10 March 2020 Presentation

Continuous-wave terahertz spectrometer without active phase modulation (Conference Presentation)

Björn Globisch, Lars Liebermeister, Simon Nellen, Robert Kohlhaas, Martin Schell

Proceedings Volume 11279, 112790U (2020) https://doi.org/10.1117/12.2545856

KEYWORDS: Terahertz radiation, Phase modulation, Spectroscopy, Continuous wave operation, Receivers, Free space optics, Electronics, Phase shift keying, Optoelectronics, Complex systems

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Proceedings Article | 1 March 2019 Presentation + Paper

Continuous wave terahertz spectrometer with 2 THz bandwidth and update rates of 24 Hz

Lars Liebermeister, Simon Nellen, Robert Kohlhaas, Martin Schell, Björn Globisch

Proceedings Volume 10917, 109171E (2019) https://doi.org/10.1117/12.2509606

KEYWORDS: Terahertz radiation, Spectroscopy, Continuous wave operation, Receivers, Reflection, Tunable lasers, Infrared radiation, Nondestructive evaluation, Terahertz spectroscopy, Modulation

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Proceedings Article | 23 February 2018 Paper

Terahertz time-domain spectroscopy for non-destructive testing

Björn Globisch, Simon Nellen, Robert Kohlhaas, Lars Liebermeister, Martin Schell

Proceedings Volume 10531, 105310O (2018) https://doi.org/10.1117/12.2290268

KEYWORDS: Terahertz radiation, Near field, Picosecond phenomena, Terahertz spectroscopy, Nondestructive evaluation, Photoresistors, Femtosecond phenomena, Antennas, Sensors, Receivers

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Proceedings Article | 23 February 2018 Paper

Recent progress of continuous-wave terahertz systems for spectroscopy, non-destructive testing, and telecommunication

Simon Nellen, Björn Globisch, Robert Kohlhaas, Lars Liebermeister, Martin Schell

Proceedings Volume 10531, 105310C (2018) https://doi.org/10.1117/12.2290207

KEYWORDS: Terahertz radiation, Receivers, Signal detection, Spectroscopy, Signal to noise ratio, Sensors, Optoelectronics, Continuous wave operation, Heterodyning, Antennas

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Showing 5 of 17 publications

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