Seyed Ehsan Hashemi

Publications (24)
Projects (0)

Showing 24 publications

2020

Recent progress for blue VCSELs and challenges to move to UV

Åsa Haglund, Filip Hjort, Johannes Enslin et al

Other conference contribution

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

2020

Are blue and ultraviolet VCSELs a reality or just a dream?

Åsa Haglund, Filip Hjort, Johannes Enslin et al

Other conference contribution

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

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 11280

Paper in proceeding

2019

Blue and ultraviolet thin-film light emitters

Åsa Haglund, Michael Alexander Bergmann, Filip Hjort et al

Other conference contribution

2019

Blue and ultraviolet vertical-cavity surface-emitting lasers

Åsa Haglund, Michael Alexander Bergmann, Filip Hjort et al

Optics InfoBase Conference Papers. Vol. Part F129-CLEO_SI 2019

Paper in proceeding

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

Towards ultraviolet and blue microcavity lasers

Michael Alexander Bergmann, Filip Hjort, Seyed Ehsan Hashemi et al

Northen Optics and Photonics conference. Vol. 2018

Paper in proceeding

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 proceeding

2018

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

Tsu-Chi Chang, Shuo-Yi Kuo, Seyed Ehsan Hashemi et al

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 10542

Paper in proceeding

Show project

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

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 proceeding

2017

Nanoscale structuring to improve laser performance

Åsa Haglund, Seyed Ehsan Hashemi, Filip Hjort et al

Proceedings of the Stanford Chalmers Workshop on Advancing Materials Innovatively. Vol. 2017

Paper in proceeding

2016

Optical Guiding and Feedback Structures in GaN-Based Vertical-Cavity Surface-Emitting Lasers

Seyed Ehsan Hashemi

Doctoral thesis

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 proceeding

2015

GaN-based VCSELs

Åsa Haglund, Seyed Ehsan Hashemi, Jörgen Bengtsson et al

VI Workshop on Physics and Technology of Semiconductor Lasers

Paper in proceeding

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

2015

Optical Guiding and Feedback in Gallium Nitride Based Vertical Cavity Surface Emitting Lasers

Seyed Ehsan Hashemi

Licentiate thesis

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

Paper in proceeding

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

Paper in proceeding

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

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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