Seyed Ehsan Hashemi

Showing 20 publications

2020

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

Tsu-Chi Chang, Seyed Ehsan Hashemi, Jörgen Bengtsson et al
GALLIUM NITRIDE MATERIALS AND DEVICES XV. Vol. 11280
Paper in proceedings
2020

Electrically Injected GaN-Based Vertical-Cavity Surface-Emitting Lasers with TiO2 High-Index-Contrast Grating Reflectors

Tsu Chi Chang, Seyed Ehsan Hashemi, Kuo Bin Hong et al
ACS Photonics. Vol. 7 (4), p. 861-866
Journal article
2019

Blue and ultraviolet vertical-cavity surface-emitting lasers

Åsa Haglund, Michael Alexander Bergmann, Filip Hjort et al
CLEO: Science and Innovations 2019
Paper in proceedings
2018

Vertical Electrical Conductivity of ZnO/GaN Multilayers for Application in Distributed Bragg Reflectors

Filip Hjort, Seyed Ehsan Hashemi, David Adolph et al
IEEE Journal of Quantum Electronics. Vol. 54 (4)
Journal article
2018

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

Tsu-Chi Chang, Shuo-Yi Kuo, Seyed Ehsan Hashemi et al
Proc. SPIE 10542, High Contrast Metastructures VII. Vol. 10542
Paper in proceedings
2018

Lasing Action in GaN-Based VCSELs with top High-Contrast Grating Reflectors

Tsu Chi Chang, Shuo Yi Kuo, Seyed Ehsan Hashemi et al
Conference Digest - IEEE International Semiconductor Laser Conference. Vol. 2018-September, p. 191-192
Paper in proceedings
2017

Effect of compositional interlayers on the vertical electrical conductivity of Si-doped AlN/GaN distributed Bragg reflectors grown on SiC''

Seyed Ehsan Hashemi, Filip Hjort, Martin Stattin et al
Applied Physics Express. Vol. 10 (5), p. 055501-
Journal article
2017

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

Filip Hjort, Seyed Ehsan Hashemi, David Adolph et al
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 10104, p. 1010413-1
Paper in proceedings
2017

Nanoscale structuring to improve laser performance

Åsa Haglund, Seyed Ehsan Hashemi, Filip Hjort et al
Paper in proceedings
2017

Thermal lensing effects on lateral leakage in GaN-based vertical-cavity surface-emitting laser cavities

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Optics Express. Vol. 25 (9), p. 9556-9568
Journal article
2016

Progress and challenges in electrically pumped GaN-based VCSELs

Åsa Haglund, Seyed Ehsan Hashemi, Jörgen Bengtsson et al
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9892
Paper in proceedings
2015

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

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9372, p. Art. no. 93720D-
Conference contribution
2015

GaN-based VCSELs

Åsa Haglund, Seyed Ehsan Hashemi, Jörgen Bengtsson et al
VI Workshop on Physics and Technology of Semiconductor Lasers
Paper in proceedings
2015

TiO2 membrane high-contrast grating reflectors for vertical-cavity light-emitters in the visible wavelength regime

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics. Vol. 33 (5)
Journal article
2014

Analysis of structurally sensitive loss in GaN-based VCSEL cavities and its effect on modal discrimination

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Optics Express. Vol. 22 (1), p. 411-426
Journal article
2014

Triggering of guiding and antiguiding effects in GaN-based VCSELs

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9001
Conference contribution
2013

Engineering the Lateral Optical Guiding in Gallium Nitride (GaN)-based Vertical-Cavity Surface-Emitting Laser (VCSEL) Cavities to Reach the Lowest Threshold Gain

Seyed Ehsan Hashemi, Johan Gustavsson, Jörgen Bengtsson et al
Japanese Journal of Applied Physics. Vol. 52 (8 PART 2), p. 08JG04 -
Journal article
2012

Engineering the transverse optical guiding in GaN-based VCSELs to avoid detrimental optical loss

Seyed Ehsan Hashemi, Johan Gustavsson, Jörgen Bengtsson et al
International Workshop on Nitride Semiconductors 2012, October 14-19, 2012, Sapporo, Japan, p. ThP-OD-33
Conference poster

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