Metal-capped high-contrast-grating for efficient surface-extraction of THz waves generated by difference-frequency generation in quantum cascade lasers

Yutaka Kadoya; Yuki Hashiuchi

doi:10.1117/12.2588972

12 April 2021 Metal-capped high-contrast-grating for efficient surface-extraction of THz waves generated by difference-frequency generation in quantum cascade lasers

Yutaka Kadoya, Yuki Hashiuchi

Author Affiliations +

Proceedings Volume 11725, Next-Generation Spectroscopic Technologies XIV; 1172504 (2021) https://doi.org/10.1117/12.2588972
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

We discuss the design of gratings that extract THz waves from the surface of quantum cascade lasers, in which the THz wave is generated by difference-frequency generation with Cerenkov phase-matching. The grating is a type of highcontrast- grating (HCG), which has been shown to be a good element of meta-surfaces. Although bare HCGs monolithically fabricated on the semiconductor do not work well, we found that the efficiency is increased to 34% in 1st order grating, 43% in 2nd order grating, and 75% in sub-1st order grating, by capping the ridge of the grating and the bottom of the groove by a metal layer.

Conference Presentation

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Yutaka Kadoya and Yuki Hashiuchi "Metal-capped high-contrast-grating for efficient surface-extraction of THz waves generated by difference-frequency generation in quantum cascade lasers", Proc. SPIE 11725, Next-Generation Spectroscopic Technologies XIV, 1172504 (12 April 2021); https://doi.org/10.1117/12.2588972

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