Dr. Seyed Ehsan Hashemi Profile

Dr. Seyed Ehsan Hashemi

SPIE Involvement:

Author

Area of Expertise:

Optoelectronics , Photonics

Publications (6)

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

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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

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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

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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

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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

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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

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Showing 5 of 6 publications

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