Prof. Andreas Waag Profile

Prof. Andreas Waag

at Technische Univ Braunschweig

SPIE Involvement:

Author

Publications (37)

Proceedings Article | 13 March 2024 Presentation

Presentation

From MicroLEDs to neuromorphic computing

Andreas Waag, Steffen Bornemann, Georg Schöttler, Maximilian Vergin, Florian Meierhofer, Mayra Garcés-Schröder, Michael Fahrbach, Jana Hartmann, Robert Kraneis, Maximilian Müller, Noah Kaelin, Christian Werner

Proceedings Volume PC12906, PC129060G (2024) https://doi.org/10.1117/12.2692716

KEYWORDS: Optical computing, Gallium nitride, Pattern recognition, Parallel computing, Optogenetics, Optical sensing, Optical fibers, Optical communications, Microscopy, Maskless lithography

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Proceedings Article | 9 March 2024 Presentation

Presentation

Polarization-induced doping in vertical AlGaN transistors

Bernd Witzigmann, Samuel Faber, Rany Miranti-Augustin, Friedhard Römer, Christoph Margenfeld, Andreas Waag

Proceedings Volume PC12886, PC128860L (2024) https://doi.org/10.1117/12.3002362

KEYWORDS: Aluminum gallium nitride, Doping, Transistors, Electric fields, Aluminum nitride, Simulations, Polarization, Interfaces, TCAD, Scattering

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Proceedings Article | 5 March 2021 Presentation

Presentation

Towards optically pumped GaN-based high-contrast grating V(E)CSELs

Frederik Luessmann, Jana Hartmann, Hergo-Heinrich Wehmann, Constantin Hilbrunner, Joerg Malindretos, Angela Rizzi, Stefanie Kroker, Andreas Waag

Proceedings Volume 11706, 117061I (2021) https://doi.org/10.1117/12.2578577

KEYWORDS: Optical pumping, Quantum wells, Mirrors, Mirror structures, Absorption, Vapor phase epitaxy, Scattering, Scanning transmission electron microscopy, Scanning electron microscopy, Reflectometry

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Proceedings Article | 5 March 2021 Presentation + Paper

Presentation + Paper

A nano-illumination microscope with 7 mm2 extended field-of-view and resolution below 1µm

S. Moreno, J. Canals, V. Moro, N. Franch, A. Vilà, A. Romano, J. Prades, D. Bezshlyakh, A. Waag, S. Krieger, S. Geleff, A. Diéguez

Proceedings Volume 11651, 116510P (2021) https://doi.org/10.1117/12.2578225

KEYWORDS: Microscopes, Light emitting diodes, Microscopy, Super resolution, Reconstruction algorithms, Optical microscopy, Medical devices, Life sciences, Image sensors, Image restoration

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Proceedings Article | 5 March 2021 Presentation

Presentation

MicroLED arrays as novel structured micro illumination light engines (SMILE)

Jan Gülink, Michael Fahrbach, Maximilian Müller, Klaas Strempel, Steffen Bornemann, Georg Schöttler, Andreas Waag

Proceedings Volume 11706, 1170608 (2021) https://doi.org/10.1117/12.2578159

KEYWORDS: Light emitting diodes, Gallium nitride, Electronics, System integration, Modulation, Microscopy, Fabrication, Control systems, Visible radiation, Transistors

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Proceedings Article | 30 March 2020 Presentation + Paper

Presentation + Paper

A shadow image microscope based on an array of nanoLEDs

Joan Canals, Victor Moro, Nil Franch, Sergio Moreno, Oscar Alonso, Anna Vilà, Juan Daniel Prades, Jan Gülink, Daria Bezshlyakh, Andreas Waag, Angel Diéguez

Proceedings Volume 11351, 113510D (2020) https://doi.org/10.1117/12.2559394

KEYWORDS: Light emitting diodes, Microscopes, Image sensors, Sensors, Cameras, Microscopy, CMOS sensors, Image processing, Image resolution

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Proceedings Article | 9 September 2019 Paper

Paper

Towards a super-resolution structured illumination microscope based on an array of nanoLEDs

Nil Franch, Joan Canals, Victor Moro, Oscar Alonso, Sergio Moreno, Anna Vilà, Joan Daniel Prades, Jan Gülink, Hutomo Suryo Wasisto, Andreas Waag, Ángel Diéguez

Proceedings Volume 11105, 111050O (2019) https://doi.org/10.1117/12.2529258

KEYWORDS: Light emitting diodes, Microscopes, Sensors, Microscopy, Super resolution, Electronics, Light sources, Prototyping, Control systems

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Proceedings Article | 22 July 2019 Paper

Paper

Method for non-invasive hemoglobin oxygen saturation measurement using broadband light source and color filters

Wenze Wu, Finn-Niclas Stapelfeldt, Thomas Weimann, Peter Hinze, Thorsten Dziomba, Bernd Bodermann, Stefanie Kroker, Hutomo Suryo Wasisto, Andreas Waag

Proceedings Volume 11076, 110761S (2019) https://doi.org/10.1117/12.2527202

KEYWORDS: Optical filters, Light sources, Image sensors, Sensors, Light emitting diodes, Oxygen, Oximetry, Tissue optics, Signal detection, Signal processing

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Proceedings Article | 4 March 2019 Presentation

Presentation

Towards super-resolution illumination from InGaN/GaN nanoLED arrays (Conference Presentation)

Matthias Auf der Maur, Daniele Palazzo, Jan Gülink, Steffen Bornemann, Hutomo Suryo Wasisto, Andrea Reale, Joan Daniel Prades, Andreas Waag, Aldo Di Carlo

Proceedings Volume 10940, 109400C (2019) https://doi.org/10.1117/12.2508701

KEYWORDS: Super resolution, Near field optics, Light emitting diodes, Optical arrays, Nanorods, Microscopes, Near field

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Proceedings Article | 14 March 2018 Presentation

Presentation

Nanoscopic insights into the structural and optical properties of a thick InGaN shell grown coaxially on GaN microrod (Conference Presentation)

Frank Bertram, Marcus Mueller, Gordon Schmidt, Sebastian Metzner, Peter Veit, Juergen Christen, Jana Hartmann, Hao Zhou, H.H. Wehmann, Andreas Waag

Proceedings Volume 10532, 105321E (2018) https://doi.org/10.1117/12.2288262

KEYWORDS: Indium gallium nitride, Gallium nitride, Luminescence, Electron microscopes, Scanning transmission electron microscopy, Optical properties, Nanorods, Metals, Vapor phase epitaxy, Scanning electron microscopy

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Proceedings Article | 19 April 2017 Presentation

Presentation

Direct comparison of structural and optical properties of a nitride-based core-shell microrod LED by means of highly spatially-resolved cathodoluminescence and u-Raman (Conference Presentation)

Frank Bertram, Marcus Müller, Peter Veit, Christian Nenstiel, Gordon Callsen, Matin Mohajerani, Jana Hartmann, Hao Zhou, Hergo-Heinrich Wehmann, Axel Hoffmann, Andreas Waag, Jürgen Christen

Proceedings Volume 10104, 101041V (2017) https://doi.org/10.1117/12.2251748

KEYWORDS: Scanning electron microscopy, Electron microscopes, Gallium nitride, Quantum wells, Indium gallium nitride, Scanning transmission electron microscopy, Light emitting diodes, Raman spectroscopy, Indium, Optical properties

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Proceedings Article | 8 March 2016 Paper

Paper

Position-controlled MOVPE growth and electro-optical characterization of core-shell InGaN/GaN microrod LEDs

Tilman Schimpke, H.-J. Lugauer, A. Avramescu, T. Varghese, A. Koller, J. Hartmann, J. Ledig, A. Waag, M. Strassburg

Proceedings Volume 9768, 97680T (2016) https://doi.org/10.1117/12.2214122

KEYWORDS: 3D microstructuring, Electroluminescence, Microtechnology, Nanoepitaxy, Optical microcavities, Light emitting diodes, Quantum wells, 3D metrology, Gallium nitride, Transmission electron microscopy, Nanolithography, Electro optics, Indium gallium nitride, Vapor phase epitaxy, External quantum efficiency, Photomasks, Semiconducting wafers, Transparent conductors, Luminescence

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Proceedings Article | 8 March 2016 Paper

Paper

Estimation of free carrier concentrations in high-quality heavily doped GaN:Si micro-rods by photoluminescence and Raman spectroscopy

M. Mohajerani, S. Khachadorian, C. Nenstiel, T. Schimpke, A. Avramescu, M. Strassburg, A. Hoffmann, A. Waag

Proceedings Volume 9768, 976803 (2016) https://doi.org/10.1117/12.2212890

KEYWORDS: Raman spectroscopy, Gallium nitride, Doping, Light emitting diodes, Luminescence, Crystals, Sapphire, Silicon, Plasmons, Electrons

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Proceedings Article | 21 May 2015 Paper

Paper

Electrothermal piezoresistive cantilever resonators for personal measurements of nanoparticles in workplace exposure

Hutomo Suryo Wasisto, Wenze Wu, Erik Uhde, Andreas Waag, Erwin Peiner

Proceedings Volume 9517, 95170B (2015) https://doi.org/10.1117/12.2180151

KEYWORDS: Sensors, Resonators, Nanoparticles, Silicon, Finite element methods, Carbon, Neptunium, Resistors, Head, Wheatstone bridges

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Proceedings Article | 21 May 2015 Paper

Paper

Fabrication of wear-resistant silicon microprobe tips for high-speed surface roughness scanning devices

Hutomo Suryo Wasisto, Feng Yu, Lutz Doering, Stefan Völlmeke, Uwe Brand, Andrey Bakin, Andreas Waag, Erwin Peiner

Proceedings Volume 9517, 951723 (2015) https://doi.org/10.1117/12.2179866

KEYWORDS: Silicon, Sensors, Atomic layer deposition, Etching, Cryogenics, Dry etching, Plasma, Surface roughness, Aluminum, Wet etching

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Proceedings Article | 8 March 2014 Paper

Paper

Oxides for sustainable photovoltaics with earth-abundant materials

Alexander Wagner, Mathieu Stahl, Nikolai Ehrhardt, Andreas Fahl, Johannes Ledig, Andreas Waag, Andrey Bakin

Proceedings Volume 8987, 898726 (2014) https://doi.org/10.1117/12.2044734

KEYWORDS: Copper, Oxygen, Solar cells, Atomic layer deposition, Zinc oxide, Protactinium, Interfaces, Atomic force microscopy, Oxides, Photovoltaics

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Proceedings Article | 17 May 2013 Paper

Paper

Fabrication of vertical nanowire resonators for aerosol exposure assessment

Stephan Merzsch , Hutomo Suryo Wasisto, Andrej Stranz , Peter Hinze , Thomas Weimann , Erwin Peiner , Andreas Waag

Proceedings Volume 8763, 87630V (2013) https://doi.org/10.1117/12.2016932

KEYWORDS: Etching, Silicon, Nanolithography, Deep reactive ion etching, Aerosols, Resonators, Cryogenics, Scanning electron microscopy, Sensors, Nanowires

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Proceedings Article | 17 May 2013 Paper

Paper

Simulation and characterization of silicon nanopillar-based nanoparticle sensors

Hutomo Suryo Wasisto, Stephan Merzsch , Kai Huang , Andrej Stranz , Andreas Waag , Erwin Peiner

Proceedings Volume 8763, 876321 (2013) https://doi.org/10.1117/12.2016970

KEYWORDS: Sensors, Silicon, Finite element methods, Nanoparticles, Resonators, 3D modeling, Neptunium, Scanning electron microscopy, Etching, Titanium dioxide

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Proceedings Article | 17 May 2013 Paper

Paper

A closed-loop system for frequency tracking of piezoresistive cantilever sensors

Hutomo Suryo Wasisto, Qing Zhang , Stephan Merzsch , Andreas Waag , Erwin Peiner

Proceedings Volume 8763, 876337 (2013) https://doi.org/10.1117/12.2017009

KEYWORDS: Sensors, Silicon, Resonators, Amplifiers, Wheatstone bridges, Linear filtering, Nanoparticles, Signal detection, Oscillators, Electronic filtering

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Proceedings Article | 17 May 2013 Paper

Paper

MEMS-based silicon cantilevers with integrated electrothermal heaters for airborne ultrafine particle sensing

Hutomo Suryo Wasisto, Stephan Merzsch , Andreas Waag , Erwin Peiner

Proceedings Volume 8763, 87632L (2013) https://doi.org/10.1117/12.2016938

KEYWORDS: Sensors, Silicon, Etching, Particles, Resistors, Semiconducting wafers, Diffusion, Oxygen, Wheatstone bridges, Cryogenics

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SPIE Journal Paper | 7 May 2012

Packaging of MEMS and MOEMS for harsh environments

Julian Kähler, Andrej Stranz, Andreas Waag, Erwin Peiner

JM3, Vol. 11, Issue 02, 021202, (May 2012) https://doi.org/10.1117/12.10.1117/1.JMM.11.2.021202

KEYWORDS: Silver, Sensors, Microelectromechanical systems, Microopto electromechanical systems, Packaging, Wheatstone bridges, Light emitting diodes, Optoelectronic devices, Silicon, Indium gallium nitride

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Proceedings Article | 28 February 2012 Paper

Paper

Luminescence and efficiency optimization of InGaN/GaN core-shell nanowire LEDs by numerical modelling

Friedhard Römer, Marcus Deppner, Zhelio Andreev, Christopher Kölper, Matthias Sabathil, Martin Strassburg, Johannes Ledig, Shunfeng Li, Andreas Waag, Bernd Witzigmann

Proceedings Volume 8255, 82550H (2012) https://doi.org/10.1117/12.908207

KEYWORDS: Light emitting diodes, Quantum wells, Luminescence, Absorption, Gallium nitride, Quantum efficiency, Polarization, Internal quantum efficiency, Quantization, Nanowires

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Proceedings Article | 5 May 2011 Paper

Paper

Nanostructured silicon for thermoelectric

A. Stranz, J. Kähler, A. Waag, E. Peiner

Proceedings Volume 8066, 80662I (2011) https://doi.org/10.1117/12.886841

KEYWORDS: Silicon, Thermoelectric materials, Resistance, Bismuth, Scanning electron microscopy, Dry etching, Etching, Nanostructuring, Electron microscopes, Nanowires

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Proceedings Article | 5 May 2011 Paper

Paper

Design and fabrication of piezoresistive p-SOI Wheatstone bridges for high-temperature applications

Julian Kähler, Lutz Döring, Stephan Merzsch, Andrej Stranz, Andreas Waag, Erwin Peiner

Proceedings Volume 8066, 806603 (2011) https://doi.org/10.1117/12.886855

KEYWORDS: Wheatstone bridges, Silicon, Resistors, Bridges, Temperature metrology, Sensors, Semiconducting wafers, Oxides, Computer aided design, Resistance

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Proceedings Article | 5 May 2011 Paper

Paper

Use of self-sensing piezoresistive Si cantilever sensor for determining carbon nanoparticle mass

H. S. Wasisto, S. Merzsch, A. Stranz, A. Waag, E. Uhde, I. Kirsch, T. Salthammer, E. Peiner

Proceedings Volume 8066, 806623 (2011) https://doi.org/10.1117/12.886622

KEYWORDS: Sensors, Nanoparticles, Carbon, Silicon, Wheatstone bridges, Aerosols, Atmospheric particles, Silicon carbide, Microelectromechanical systems, Air contamination

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Proceedings Article | 3 May 2011 Paper

Paper

Cleaning of nanopillar templates for nanoparticle collection using PDMS

S. Merzsch, H. S. Wasisto, A. Waag, I. Kirsch, E. Uhde, T. Salthammer, E. Peiner

Proceedings Volume 8068, 806819 (2011) https://doi.org/10.1117/12.886352

KEYWORDS: Particles, Silicon, Carbon, Atmospheric particles, Silicon carbide, Nanoparticles, Scanning electron microscopy, Aerosols, Picosecond phenomena, Lithography

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Proceedings Article | 19 May 2009 Paper

Paper

ICP cryogenic dry etching for shallow and deep etching in silicon

Ü. Sökmen, M. Balke, A. Stranz, S. Fündling, E. Peiner, H.-H. Wehmann, A. Waag

Proceedings Volume 7362, 736213 (2009) https://doi.org/10.1117/12.820917

KEYWORDS: Silicon, Etching, Dry etching, Plasma, Thermoelectric materials, Silicon films, Photoresist materials, Cryogenics, Thin films, Oxides

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Proceedings Article | 15 February 2008 Paper

Paper

Characterization of an optically pumped ZnO-based 3rd order distributed feedback laser

Daniel Hofstetter, Yargo Bonetti, Esther Baumann, Fabrizio Giorgetta, Abdel-Hamid El-Shaer, Andrey Bakin, Andreas Waag, Rüdiger Schmidt-Grund, Marius Grundmann, Mathias Schubert

Proceedings Volume 6895, 68950J (2008) https://doi.org/10.1117/12.762128

KEYWORDS: Zinc oxide, Diffraction gratings, Optical pumping, Luminescence, Refractive index, Temperature metrology, Diffraction, Fabry–Perot interferometers, Waveguides, Laser damage threshold

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Proceedings Article | 30 August 2006 Paper

Paper

Strong photoluminescence caused by optical transitions between electron and hole Tamm-like interface states in ZnSe/BeTe heterostructures

A. Gurevich, V. Kochereshko, A. Litvinov, A. Platonov, B. Zyakin, B. Waag, G. Landwehr

Proceedings Volume 6321, 632109 (2006) https://doi.org/10.1117/12.680052

KEYWORDS: Interfaces, Heterojunctions, Information technology, Luminescence, Polarization, Crystals, Quantum wells, Anisotropy, Semiconductors, Solids

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Proceedings Article | 2 March 2006 Paper

Paper

Optical studies of ZnO doped with transition metals

V. Avrutin, Ü. Özgür, H. Lee, S. Chevtchenko, H. Morkoc, M. Callahan, A. El-Shaer, A. Che Mofor, A. Bakin, A. Waag, N. Izyumskaya, W. Schoch, S. Sorokin, S. Ivanov

Proceedings Volume 6122, 61220B (2006) https://doi.org/10.1117/12.646854

KEYWORDS: Manganese, Zinc oxide, Zinc, Absorption, Luminescence, Ions, Ion implantation, Annealing, Magnetism, Optical properties

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Proceedings Article | 18 August 2005 Paper

Paper

Tamm-like interface states in periodical ZnSe/BeTe heterostructures: observed by spectroscopic ellipsometry

A. Gurevich, V. Kochereshko, A. Platonov, B. Zyakin, A. Waag

Proceedings Volume 5888, 58881G (2005) https://doi.org/10.1117/12.615862

KEYWORDS: Heterojunctions, Interfaces, Spectroscopic ellipsometry, Ultraviolet radiation, Polarization, Remote sensing, Anisotropy

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Proceedings Article | 11 June 2003 Paper

Paper

Optical gain and lasing of trions in delta-doped ZnSe quantum wells

Joachim Puls, G. Mikhailov, Fritz Henneberger, Dmitrii Yakovlev, Andreas Waag

Proceedings Volume 5023, (2003) https://doi.org/10.1117/12.514353

KEYWORDS: Quantum wells, Excitons, Luminescence, Dispersion, Fourier transforms, Reflectivity, Edge emitting semiconductor lasers, Waveguides, Atmospheric particles, Gallium arsenide

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Proceedings Article | 11 June 2003 Paper

Paper

Ferromagnetic GaMnAs for spintronic devices

Achim Koeder, W. Schoch, S. Frank, R. Kling, M. Oettinger, V. Avrutin, W. Limmer, Rolf Sauer, Andreas Waag

Proceedings Volume 5023, (2003) https://doi.org/10.1117/12.514534

KEYWORDS: Manganese, Magnetism, Electrons, Gallium arsenide, Spintronics, Magnetic semiconductors, Spin polarization, Temperature metrology, Field emission displays, Ferromagnetics

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Proceedings Article | 7 July 1998 Paper

Paper

Beryllium-containing II-VI semiconductor devices

Andreas Waag, Frank Fischer, H.-J. Lugauer, Karl Schuell, U. Zehnder, T. Gerhard, M. Keim, G. Reuscher, Gottfried Landwehr

Proceedings Volume 3283, (1998) https://doi.org/10.1117/12.316665

KEYWORDS: Beryllium, Gallium arsenide, Semiconductor lasers, Etching, Interfaces, Silicon, Quantum wells, Selenium, Information operations, Thin films

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Proceedings Article | 6 June 1997 Paper

Paper

Beryllium-containing materials for II-VI laser diodes

Andreas Waag, Th. Litz, Frank Fischer, H.-J. Lugauer, Robert Gunshor, Gottfried Landwehr

Proceedings Volume 2994, (1997) https://doi.org/10.1117/12.275564

KEYWORDS: Beryllium, Gallium arsenide, Semiconductor lasers, Light emitting diodes, Doping, Quantum wells, Chalcogenides, Sulfur, Magnesium, Zinc

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Proceedings Article | 3 September 1992 Paper

Paper

Effect of Coulomb potential well on exchange-induced properties of CdTe/(Cd,Mn)Te quantum wells

Alexey Kavokin, Vladimir Kochereshko, Galina Pozina, Igor Uraltsev, Dmitrii Yakovlev, Gottfried Landwehr, Robert Bicknell-Tassius, Andreas Waag

Proceedings Volume 1675, (1992) https://doi.org/10.1117/12.137630

KEYWORDS: Quantum wells, Oscillators, Magnetism, Excitons, Stereolithography, Superlattices, Ions, Physics, Tellurium, Zeeman effect

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Proceedings Article | 1 February 1991 Paper

Paper

Recent progress in device-oriented II-VI research at the University of Wuerzburg

Gottfried Landwehr, Andreas Waag, K. Hofmann, Norbert Kallis, Robert Bicknell-Tassius

Proceedings Volume 1362, (1991) https://doi.org/10.1117/12.24507

KEYWORDS: Field effect transistors, Optoelectronic devices, Cadmium, Indium, Mercury cadmium telluride, Information operations, Signal processing, Gold, Physics, Molecular beam epitaxy

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Showing 5 of 37 publications

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