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Optics and Spectroscopy, 2024 Volume 132, Issue 1, Pages 105–110 (Mi os1145)

Conference "Ultrafast Optical Phenomena (Ultra fast Light-2023)" October 2-4, 2023, Lebedev Institute of Physics, Russian Academy of Sciences
Ultraviolet, infrared, and terahertz optics

Efficient THz emission by a photoconductive emitter with tight photocarrier confinement within high-aspect ratio plasmonic electrodes

D. S. Ponomarevab, D. V. Lavrukhinba, A. E. Yachmenevba, R. R. Galieva, R. A. Khabibullinba, Yu. G. Goncharovc, K. I. Zaitsevc

a V. G. Mokerov Institute of Ultra High Frequency Semiconductor Electronics of RAS, Moscow, Russia
b Bauman Moscow State Technical University, Moscow, Russia
c Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia

Abstract: We propose, simulate and investigate how the thickness of plasmonic electrode h and the ratio between h and the period of subwavelength periodical metallic (plasmonic) grating $h/p$ on the THz emission efficiency in a photoconductive emitter. By numerical optimization we determine the grating geometry with respect to maximal optical transmission. We showcase that simultaneous increase in $h$ and $h/p$ allows efficient excitation of plasmon modes in the grating, that follows with an THz power enhancement up to 10000 compared to conventional emitter without grating. The overall THz power exceeds 5 $\mu$W in the 0.1–4 THz bandwidth, with the conversion efficiency of $\sim$0.2%. The developed grating design can be also used for photoconductive THz detectors in modern THz spectroscopic and imaging setups.

Keywords: terahertz science and technology, terahertz pulsed spectroscopy, terahertz element base, photoconductive antenna, plasmonic grating, optical light confinement, semiconductors.

Received: 11.12.2023
Revised: 09.01.2024
Accepted: 16.01.2024

DOI: 10.61011/OS.2024.01.57558.1-24



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