G. Tamamushi, T. Watanabe, J. Mitsushio, A. A. Dubinov, A. Satou, T. Suemitsu, M. Ryzhii, V. Ryzhii, T. Otsuji
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10111/1011126/Current-injection-terahertz-lasing-in-a-distributed-feedback-dual-gate/10.1117/12.2249983.pdf?SSO=1
This paper reviews recent advancement on the
research toward graphene-based terahertz (THz) lasers. Optical and/or injection
pumping of graphene can enable negative-dynamic conductivity in the THz
spectral range, which may lead to new types of THz lasers. A forward-biased
graphene structure with a lateral p-i-n junction was implemented in a
distributed-feedback (DFB) dual-gate graphene-channel FET and observed a single
mode emission at 5.2 THz at 100K. The observed spectral linewidth fairly agrees
with the modal gain analysis based on DFB-Fabry-Perrot hybrid-cavitymode
modeling. Although the results obtained are still preliminary level, the
observed emission could be interpreted as THz lasing in population-inverted
graphene by carrier-injection.
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