21 February 2018 GaN vertical-cavity surface-emitting laser with a high-contrast grating reflector
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Proceedings Volume 10542, High Contrast Metastructures VII; 105420T (2018) https://doi.org/10.1117/12.2289318
Event: SPIE OPTO, 2018, San Francisco, California, United States
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.
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Tsu-Chi Chang, Tsu-Chi Chang, Shuo-Yi Kuo, Shuo-Yi Kuo, Ehsan Hashemi, Ehsan Hashemi, Åsa Haglund, Åsa Haglund, Tien-Chang Lu, Tien-Chang Lu, } "GaN vertical-cavity surface-emitting laser with a high-contrast grating reflector", Proc. SPIE 10542, High Contrast Metastructures VII, 105420T (21 February 2018); doi: 10.1117/12.2289318; https://doi.org/10.1117/12.2289318

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