Prof. Oliver Ambacher Profile

Prof. Oliver Ambacher

Director/Professor at Fraunhofer IAF

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 5 May 2017 Presentation + Paper

Demonstration of an RF front-end based on GaN HEMT technology

Erdin Ture, Markus Musser, Axel Hülsmann, Rüdiger Quay, Oliver Ambacher

Proceedings Volume 10184, 101840V (2017) https://doi.org/10.1117/12.2262433

KEYWORDS: Signal generators, Broadband telecommunications, Photography, Legal, Unmanned aerial vehicles, Gallium nitride, Field effect transistors, Modulation, Amplifiers, Antennas, Interference (communication)

Read Abstract +

Proceedings Article | 21 October 2016 Presentation + Paper

A portable W-band radar system for enhancement of infrared vision in fire fighting operations

Mathias Klenner, Christian Zech, Axel Hülsmann, Jutta Kühn, Michael Schlechtweg, Konstantin Hahmann, Bernhard Kleiner, Michael Ulrich, Oliver Ambacher

Proceedings Volume 9993, 999307 (2016) https://doi.org/10.1117/12.2241063

KEYWORDS: Radar, Infrared cameras, Imaging systems, Cameras, Sensors, Distance measurement, Antennas, Signal processing, Radar sensor technology, Modulation

Read Abstract +

Proceedings Article | 28 August 2015 Paper

With electroluminescence microcopy towards more reliable AlGaN/GaN transistors

Martina Baeumler, Michael Dammann, Matthias Wespel, Roshna George, Helmer Konstanzer, Stephan Maroldt, Vladimir Polyakov, Stefan Müller, Wolfgang Bronner, Peter Brückner, Fouad Benkhelifa, Patrick Waltereit, Rüdiger Quay, Michael Mikulla, Joachim Wagner, Oliver Ambacher, Andreas Graff, Frank Altmann, Michél Simon-Najasek, Martino Lorenzini, Martin Fagerlind, Paul van der Wel, Thomas Roedle

Proceedings Volume 9555, 95550Y (2015) https://doi.org/10.1117/12.2189521

KEYWORDS: Electroluminescence, Field effect transistors, Semiconducting wafers, Transmission electron microscopy, Green fluorescent protein, Seaborgium, Transistors, Metals, Reliability, Interfaces

Read Abstract +

Proceedings Article | 21 May 2015 Paper

Radar system components to detect small and fast objects

Axel Hülsmann, Christian Zech, Mathias Klenner, Axel Tessmann, Arnulf Leuther, Daniel Lopez-Diaz, Michael Schlechtweg, Oliver Ambacher

Proceedings Volume 9483, 94830C (2015) https://doi.org/10.1117/12.2177017

KEYWORDS: Radar, Optical spheres, Antennas, Extremely high frequency, Amplifiers, Digital signal processing, Signal attenuation, Receivers, Doppler effect, Warfare

Read Abstract +

Proceedings Article | 27 February 2014 Paper

Influence of surface roughness on the optical mode profile in GaN-based violet ridge waveguide laser diodes

Katarzyna Holc, Annik Jakob, Thomas Weig, Klaus Köhler, Oliver Ambacher, Ulrich Schwarz

Proceedings Volume 9002, 90020I (2014) https://doi.org/10.1117/12.2037336

KEYWORDS: Waveguides, Electroluminescent displays, Surface roughness, Semiconductor lasers, Gallium nitride, Scattering, Laser scattering, Diodes, Interfaces, Waveguide lasers

Read Abstract +

SPIE Journal Paper | 10 June 2013

MOEMS tunable microlens made of aluminum nitride membranes

Steffen Leopold, Tobias Polster, Daniel Paetz, Fabian Knoebber, Oliver Ambacher, Stefan Sinzinger, Martin Hoffmann

JM3, Vol. 12, Issue 02, 023012, (June 2013) https://doi.org/10.1117/12.10.1117/1.JMM.12.2.023012

KEYWORDS: Aluminum nitride, Microopto electromechanical systems, Microlens, Lenses, Spherical lenses, Nitrogen, Semiconducting wafers, Manufacturing, Silicon, Solids

Read Abstract +

Proceedings Article | 29 May 2013 Paper

Broadband absorption and emission millimeter-wave spectroscopy between 220 and 325 GHz

Michael Szymkiewicz, Axel Hülsmann, Axel Tessmann, Michael Schlechtweg, Arnulf Leuther, Oliver Ambacher, Stefan Koch, Matthias Riedel, Ingmar Kallfass

Proceedings Volume 8726, 872610 (2013) https://doi.org/10.1117/12.2015222

KEYWORDS: Absorption, Molecules, Spectroscopy, Receivers, Gases, Transmitters, Antennas, NOx, Emission spectroscopy, Signal detection

Read Abstract +

Proceedings Article | 13 March 2013 Paper

Tunable cylindrical microlenses based on aluminum nitride membranes

Steffen Leopold, Daniel Paetz, Fabian Knoebber, Oliver Ambacher, Stefan Sinzinger, Martin Hoffmann

Proceedings Volume 8616, 861611 (2013) https://doi.org/10.1117/12.2005131

KEYWORDS: Aluminum nitride, Silicon, Cylindrical lenses, Finite element methods, Silica, Lenses, Micro optics, Silicon films, Deep reactive ion etching, Beam shaping

Read Abstract +

Proceedings Article | 13 October 2011 Paper

Active millimeter-wave imaging system for material analysis and object detection

Christian Zech, Axel Hülsmann, Ingmar Kallfass, Axel Tessmann, Martin Zink, Michael Schlechtweg, Arnulf Leuther, Oliver Ambacher

Proceedings Volume 8188, 81880D (2011) https://doi.org/10.1117/12.898796

KEYWORDS: Reflection, Imaging systems, Metals, Millimeter wave imaging, Materials analysis, Mirrors, Receivers, Antennas, Linear filtering, Epoxies

Read Abstract +

Proceedings Article | 26 May 2011 Paper

W-band direct detection radiometers using metamorphic HEMT technology

Ingmar Kallfass, Axel Huelsmann, Axel Tessmann, Arnulf Leuther, E. Weissbrodt, M. Schlechtweg, O. Ambacher

Proceedings Volume 8022, 80220O (2011) https://doi.org/10.1117/12.883473

KEYWORDS: Switches, Radiometry, Sensors, Antennas, Field effect transistors, Waveguides, Amplifiers, Diodes, Transistors, Extremely high frequency

Read Abstract +

Proceedings Article | 14 February 2011 Paper

Tunable refractive beam steering using aluminum nitride thermal actuators

S. Leopold, D. Paetz, F. Knoebber, T. Polster, O. Ambacher, S. Sinzinger, M. Hoffmann

Proceedings Volume 7931, 79310B (2011) https://doi.org/10.1117/12.874826

KEYWORDS: Aluminum nitride, Actuators, Silicon, Beam steering, Thin films, Eye, Prisms, Numerical analysis, Image quality, Silica

Read Abstract +

Proceedings Article | 13 May 2010 Paper

Tunable compound eye cameras

Daniel Pätz, Steffen Leopold, Fabian Knöbber, Stefan Sinzinger, Martin Hoffmann, Oliver Ambacher

Proceedings Volume 7716, 77160K (2010) https://doi.org/10.1117/12.854532

KEYWORDS: Aluminum nitride, Chemical elements, Eye, Cameras, Actuators, Microlens, Thin films, Image quality, Prisms, Silicon films

Read Abstract +

Proceedings Article | 24 September 2009 Paper

Millimeter-wave monolithic integrated circuits for imaging and remote sensing at 140, 200, and 300 GHz

Ingmar Kallfass, Axel Tessmann, Arnulf Leuther, Hermann Massler, Michael Schlechtweg, Oliver Ambacher

Proceedings Volume 7485, 74850L (2009) https://doi.org/10.1117/12.830310

KEYWORDS: Integrated circuits, Remote sensing, Amplifiers, Terahertz technology, Oscillators, Heterodyning, Receivers, Fourier transforms, Wave sensors, Terahertz radiation

Read Abstract +

Proceedings Article | 29 April 2009 Paper

Active millimeter-wave imaging using a raster scanner

Axel Hülsmann, Andreas Liebelt, Axel Tessmann, Arnulf Leuther, Michael Schlechtweg, Oliver Ambacher

Proceedings Volume 7308, 730808 (2009) https://doi.org/10.1117/12.813388

KEYWORDS: Mirrors, Antennas, Extremely high frequency, Scanners, Millimeter wave imaging, Imaging systems, Metals, Radar, Signal processing, Raster graphics

Read Abstract +

Proceedings Article | 2 October 2008 Paper

Enabling compact MMIC-based frontends for millimeter-wave imaging radar and radiometry at 94 and 210 GHz

Ingmar Kallfass, Axel Tessmann, Arnulf Leuther, Michael Kuri, Markus Riessle, Martin Zink, Hermann Massler, Michael Schlechtweg, Oliver Ambacher

Proceedings Volume 7117, 71170O (2008) https://doi.org/10.1117/12.800243

KEYWORDS: Radar, Radiometry, Millimeter wave imaging, Roentgenium, Antennas, Terahertz technology, Fourier transforms, Analog electronics, Radar imaging, Receivers

Read Abstract +

Proceedings Article | 13 February 2008 Paper

(AlGaIn)N UV LEDs for integrated metal-oxide based ozone sensors

J. Wagner, Ch. Y. Wang, C.-C. Röhlig, M. Maier, M. Kunzer, T. Passow, W. Schirmacher, W. Pletschen, V. Cimalla, K. Köhler, O. Ambacher

Proceedings Volume 6910, 69100X (2008) https://doi.org/10.1117/12.761128

KEYWORDS: Ozone, Sensors, Light emitting diodes, Near ultraviolet, Quantum wells, Electroluminescence, Gallium nitride, Sapphire, Ultraviolet radiation, Ultraviolet light emitting diodes

Read Abstract +

Proceedings Article | 13 February 2008 Paper

10 W high-efficiency high-brightness tapered diode lasers at 976 nm

R. Ostendorf, G. Kaufel, R. Moritz, M. Mikulla, O. Ambacher, M. Kelemen, J. Gilly

Proceedings Volume 6876, 68760H (2008) https://doi.org/10.1117/12.761124

KEYWORDS: Semiconductor lasers, Monochromatic aberrations, Diffraction, Temperature metrology, Heatsinks, Quantum wells, Near field optics, Fiber amplifiers, Continuous wave operation, Virtual point source

Read Abstract +

Proceedings Article | 19 April 2006 Paper

InN as THz emitter excited at 1060 nm and 800 nm

Boris Pradarutti, Gabor Matthäus, Claudia Brückner, Stefan Riehemann, Gunther Notni, Stefan Nolte, Volker Cimalla, Vadim Lebedev, Oliver Ambacher, Andreas Tünnermann

Proceedings Volume 6194, 61940I (2006) https://doi.org/10.1117/12.662301

KEYWORDS: Terahertz radiation, Indium nitride, Indium arsenide, Electrons, Semiconductors, Gallium arsenide, Gallium antimonide, Pulsed laser operation, Antennas, Sapphire

Read Abstract +

Showing 5 of 18 publications

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