Photoconductive THz emitters with high-aspect-ratio plasmonic gratings

Dmitry S. Ponomarev

doi:10.1117/12.2588753

4 May 2021 Photoconductive THz emitters with high-aspect-ratio plasmonic gratings

Dmitry S. Ponomarev

Proceedings Volume 11846, Saratov Fall Meeting 2020: Laser Physics, Photonic Technologies, and Molecular Modeling; 118460G (2021) https://doi.org/10.1117/12.2588753
Event: Saratov Fall Meeting 2020, 2020, Saratov, Russian Federation

Abstract

The plasmon-assisted photoconductive antenna-emitter has been developed, optimized, and fabricated on a semi-insulating GaAs photoconductive substrate. Using numerical simulation, we showed that a high aspect-ratio of the antenna plasmonic electrodes h/p = 0.5 (where h and p are height and period of metal grating, respectively) can substantially increase the amplitude of the electric field at the shadow side of the grating leading a robust localization of photocarriers in vicinity to plasmonic electrodes. The plasmonic PCA-emitter exhibits 10 μW of the emitted THz power at optical pump of 10 mW, high thermal (breakdown) stability, and the increased dynamic range, as well.

Citation Download Citation

Dmitry S. Ponomarev "Photoconductive THz emitters with high-aspect-ratio plasmonic gratings", Proc. SPIE 11846, Saratov Fall Meeting 2020: Laser Physics, Photonic Technologies, and Molecular Modeling, 118460G (4 May 2021); https://doi.org/10.1117/12.2588753

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