A grating-bicoupled plasma-wave photomixer with resonant-cavity enhanced structure

Taiichi Otsuji, Mitsuhiro Hanabe, Takuya Nishimura, Eiichi Sano

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)


A novel terahertz plasma-wave photomixer that can improve the conversion gain and terahertz radiation power is proposed and evaluated. The photomixer is based on a high-electron mobility transistor and incorporates doubly interdigitated grating strips for the gate electrodes that periodically localize the 2D plasmons in 100-nm regions with a micron-order interval. A vertical cavity structure is formed in between the top metal grating and a terahertz mirror placed at the backside. The device features electronic tuning of plasmon characteristic frequencies, providing continuously-tunable operation below 1 THz to beyond 10 THz. Frequency-dependent finite-differential time-domain analysis demonstrates that the grating-bicoupled plasmonic structure acts as a broadband terahertz photomixer and antenna and that the vertical cavity structure effectively enhances the conversion gain and radiation power.

Original languageEnglish
Pages (from-to)4815-4825
Number of pages11
JournalOptics Express
Issue number11
Publication statusPublished - 2006 May


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