Prof. Åsa Haglund Profile

Prof. Åsa Haglund

Professor at Chalmers Univ of Technology

SPIE Involvement:

Conference Program Committee | Author

Publications (26)

Proceedings Article | 13 March 2024 Open Access

Semiconductor lasers pushed deeper into unseen wavelengths and frontiers

Åsa Haglund

Proceedings Volume PC12904, PC1290401 (2024) https://doi.org/10.1117/12.3012536

Read Abstract +

Proceedings Article | 21 March 2023 Presentation

Electrochemical etching for thin-film light-emitters

Åsa Haglund, Filip Hjort, Johannes Enslin, Michael Bergmann, Munise Cobet, Giulia Cardinali, Nando Prokop, Lars Persson, Estrella Torres, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Tim Kolbe, Joachim Ciers, Tim Wernicke, Michael Kneissl

Proceedings Volume PC12421, (2023) https://doi.org/10.1117/12.2651475

KEYWORDS: Thin films, Electrochemical etching

Read Abstract +

Proceedings Article | 9 March 2022 Presentation

Thin-film UV VCSELs and LEDs by electrochemical etching

Åsa Haglund, Filip Hjort, Johannes Enslin, Michael Bergmann, Munise Cobet, Giulia Cardinali, Nando Prokop, Lars Persson, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Tim Kolbe, Johan Gustavsson, Joachim Ciers, Tim Wernicke, Michael Kneissl

Proceedings Volume PC12022, PC120220B (2022) https://doi.org/10.1117/12.2612369

KEYWORDS: Vertical cavity surface emitting lasers, Ultraviolet radiation, Electrochemical etching, Thin films, Mirrors, Thermal optics, Light emitting diodes, Etching, Dielectric mirrors

Read Abstract +

Proceedings Article | 5 March 2022 Presentation

Thin-film flip-chip UVB LEDs realized by electrochemical etching

Michael Bergmann, Johannes Enslin, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Tim Kolbe, Tim Wernicke, Michael Kneissl, Åsa Haglund

Proceedings Volume PC12001, PC120010T (2022) https://doi.org/10.1117/12.2609581

KEYWORDS: Thin films, Light emitting diodes, Electrochemical etching

Read Abstract +

Proceedings Article | 5 March 2022 Presentation

Out of the blue: UV VCSELs

Åsa Haglund, Filip Hjort, Johannes Enslin, Michael Bergmann, Munise Cobet, Giulia Cardinali, Nando Prokop, Lars Persson, Tim Kolbe, Johan Gustavsson, Joachim Ciers, Tim Wernicke, Michael Kneissl

Proceedings Volume PC12001, PC120010F (2022) https://doi.org/10.1117/12.2612378

KEYWORDS: Vertical cavity surface emitting lasers, Ultraviolet radiation, Mirrors, Electrochemical etching, Dielectric mirrors

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Advances in ultraviolet-emitting vertical-cavity surface-emitting lasers

Filip Hjort, Johannes Enslin, Munise Cobet, Michael Bergmann, Joachim Ciers, Giulia Cardinali, Nando Prokop, Tim Kolbe, Felix Nippert, Markus Wagner, Johan Gustavsson, Tim Wernicke, Michael Kneissl, Åsa Haglund

Proceedings Volume 11686, 116860F (2021) https://doi.org/10.1117/12.2576044

KEYWORDS: Vertical cavity surface emitting lasers, Optical pumping, Laser therapeutics, Electrochemical etching, Distributed Bragg reflectors, Dielectrics

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Thin-film flip-chip UVB LEDs enabled by electrochemical etching

Michael Bergmann, Johannes Enslin, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Filip Hjort, Tim Kolbe, Tim Wernicke, Michael Kneissl, Åsa Haglund

Proceedings Volume 11686, 1168612 (2021) https://doi.org/10.1117/12.2582972

KEYWORDS: Light emitting diodes, Electrochemical etching, Thin films, Ultraviolet radiation, Vapor phase epitaxy, Ultraviolet light emitting diodes, Therapeutics, Silicon, Silica, Multilayers

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Impact of polarization fields on electrochemical lift-off of GaN membranes

Joachim Ciers, Michael Bergmann, Filip Hjort, Jean-François Carlin, Nicolas Grandjean, Åsa Haglund

Proceedings Volume 11686, 116860J (2021) https://doi.org/10.1117/12.2578376

KEYWORDS: Polarization, Gallium nitride, Ultraviolet radiation, Optical resonators, Waveguides, Visible radiation, Thin films, Thin film devices, Surface roughness, Resonators

Read Abstract +

Proceedings Article | 16 February 2020 Presentation + Paper

GaN-based vertical-cavity surface-emitting laser incorporating a TiO2 high-index-contrast grating

Tsu-Chi Chang, Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson, Åsa Haglund, Tien-Chang Lu

Proceedings Volume 11280, 112800M (2020) https://doi.org/10.1117/12.2545315

KEYWORDS: Vertical cavity surface emitting lasers, Titanium dioxide, Reflectivity, Gallium nitride, Reflectors, Dielectrics, Mirrors, Dielectric polarization, Refractive index, Optical design

Read Abstract +

Proceedings Article | 21 February 2018 Paper

GaN vertical-cavity surface-emitting laser with a high-contrast grating reflector

Tsu-Chi Chang, Shuo-Yi Kuo, Ehsan Hashemi, Åsa Haglund, Tien-Chang Lu

Proceedings Volume 10542, 105420T (2018) https://doi.org/10.1117/12.2289318

KEYWORDS: Vertical cavity surface emitting lasers, Reflectivity, Gallium nitride, Titanium dioxide, Reflectors, Optical pumping, Scanning electron microscopy, Photomasks, Mirrors, Ultraviolet radiation

Read Abstract +

Proceedings Article | 20 February 2017 Presentation + Paper

Multi-wavelength VCSEL arrays using high-contrast gratings

Erik Haglund, Johan Gustavsson, Wayne Sorin, Jörgen Bengtsson, David Fattal, Åsa Haglund, Michael Tan, Anders Larsson

Proceedings Volume 10113, 101130B (2017) https://doi.org/10.1117/12.2256348

KEYWORDS: Vertical cavity surface emitting lasers, Reflectivity, Wavelength division multiplexing, Optical interconnects, Light sources, Distributed Bragg reflectors, Gallium arsenide, Lithography, Dry etching, Indium gallium phosphide, Mirrors, Etching, Oxides, Quantum wells, Semiconductors

Read Abstract +

Proceedings Article | 16 February 2017 Presentation + Paper

Electrically conductive ZnO/GaN distributed Bragg reflectors grown by hybrid plasma-assisted molecular beam epitaxy

Filip Hjort, Ehsan Hashemi, David Adolph, Tommy Ive, Åsa Haglund

Proceedings Volume 10104, 1010413 (2017) https://doi.org/10.1117/12.2250126

KEYWORDS: Resistance, Zinc oxide, Distributed Bragg reflectors, Gallium nitride, Vertical cavity surface emitting lasers, Molecular beam epitaxy, Doping, Refractive index, Mirrors, Reflectivity, Polarization, Aluminum

Read Abstract +

Proceedings Article | 28 April 2016 Open Access

Progress and challenges in electrically pumped GaN-based VCSELs

Å. Haglund, E. Hashemi, J. Bengtsson, J. Gustavsson, M. Stattin, M. Calciati, M. Goano

Proceedings Volume 9892, 98920Y (2016) https://doi.org/10.1117/12.2229428

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Reflectivity, Gallium nitride, Titanium dioxide, Vertical cavity surface emitting lasers, Gallium nitride, Quantum wells, Dielectrics, Refractive index, Absorption, Etching

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 27 February 2015 Paper

Integration of GaAs-based VCSEL array on SiN platform with HCG reflectors for WDM applications

Sulakshna Kumari, Johan Gustavsson, Ruijun Wang, Emanuel Haglund, Petter Westbergh, Dorian Sanchez, Erik Haglund, Åsa Haglund, Jörgen Bengtsson, Nicolas Le Thomas, Gunther Roelkens, Anders Larsson, Roel Baets

Proceedings Volume 9372, 93720U (2015) https://doi.org/10.1117/12.2077090

KEYWORDS: Vertical cavity surface emitting lasers, Silicon, Reflectivity, Waveguides, Silica, Etching, Reflectors, Interfaces, Mirrors, Wavelength division multiplexing

Read Abstract +

Proceedings Article | 27 February 2015 Paper

Air-suspended TiO2-based HCG reflectors for visible spectral range

Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson, Stefan Carlsson, Georg Rossbach, Åsa Haglund

Proceedings Volume 9372, 93720D (2015) https://doi.org/10.1117/12.2078951

KEYWORDS: Silica, Etching, Vertical cavity surface emitting lasers, Dielectrics, Semiconducting wafers, Silicon, Nickel, Dielectric polarization, Reflectivity, Titanium dioxide

Read Abstract +

Proceedings Article | 27 February 2014 Paper

Triggering of guiding and antiguiding effects in GaN-based VCSELs

Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson, Martin Stattin, Marlene Glauser, Gatien Cosendey, Nicolas Grandjean, Marco Calciati, Michele Goano, Åsa Haglund

Proceedings Volume 9001, 90010A (2014) https://doi.org/10.1117/12.2038152

KEYWORDS: Vertical cavity surface emitting lasers, Quantum wells, Silica, Gallium nitride, Aluminum nitride, Mirrors, Thermography, Computer simulations, 3D modeling, Thermal effects

Read Abstract +