Ultra-low-noise, room-temperature terahertz receiver based on plasmonic photomixing

Joseph Hwang; Szu-An Tsao; Mona Jarrahi

doi:10.1117/12.3029593

2 October 2024 Ultra-low-noise, room-temperature terahertz receiver based on plasmonic photomixing

Joseph Hwang, Szu-An Tsao, Mona Jarrahi

Proceedings Volume PC13141, Terahertz Emitters, Receivers, and Applications XV; PC1314108 (2024) https://doi.org/10.1117/12.3029593
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Heterodyne receivers, based on plasmonic photomixers have demonstrated high-sensitivity and broadband terahertz detection with high spectral resolution. They consist of a terahertz antenna with plasmonic contact electrodes fabricated on a photoconductive substrate. When the photomixer is pumped by two Continuous-Wave (CW) lasers with a terahertz beat frequency, the received terahertz signal by the antenna is down-converted to an intermediate frequency (IF) equal to the difference between the received terahertz frequency and optical beat frequency. The IF signal power increases quadratically with the optical pump power at low optical pump powers. However, the dependence of the IF signal on the optical pump power deviated from a quadratic behavior at high optical powers and could eventually saturate, limiting the maximum responsivity and Signal-to-Noise Ratio (SNR). We demonstrate that large area nanoantenna arrays, based on plasmonic gratings expand the device active area, raising the ceiling on optical power and, therefore, sensitivity.

Conference Presentation

Citation Download Citation

Joseph Hwang, Szu-An Tsao, and Mona Jarrahi "Ultra-low-noise, room-temperature terahertz receiver based on plasmonic photomixing", Proc. SPIE PC13141, Terahertz Emitters, Receivers, and Applications XV, PC1314108 (2 October 2024); https://doi.org/10.1117/12.3029593

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KEYWORDS

Plasmonics

Nanoantennas

Receivers

Antennas

Heterodyning

Electrodes

Terahertz radiation

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