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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


We report a GaN-based VCSEL with a high-contrast grating (HCG) as the top mirror. The HCG consisted of TiO2 and rested directly on the n-GaN without an airgap or the use of any DBR layers to boost the reflectivity. The full VCSEL structure was optically pumped at room temperature and showed a lasing threshold of approximately 0.69MW/cm2 and a lasing wavelength at 369.1 nm. This first demonstration of lasing in a HCG GaN-based VCSEL opens up the possibility to explore all the potential benefits of HCGs in the blue and ultraviolet spectral regime.

Original languageEnglish
Title of host publicationHigh Contrast Metastructures VII
EditorsConnie J. Chang-Hasnain, Andrei Faraon, Fumio Koyama, Weimin Zhou
ISBN (Electronic)9781510615694
StatePublished - 1 Jan 2018
EventHigh Contrast Metastructures VII 2018 - San Francisco, United States
Duration: 29 Jan 201831 Jan 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceHigh Contrast Metastructures VII 2018
CountryUnited States
CitySan Francisco


  • GaN
  • high contrast grating (HCG)
  • TiO
  • vertical cavity surface emitting laser (VCSEL)

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