Low power requirement photoconductive antenna detectors based on a perfectly absorbing metasurfaces

Lucy Hale; Charles T. Harris; Ting Shan Luk; Sadhvikas J. Addamane; John L. Reno; Igal Brener; Oleg Mitrofanov

doi:10.1117/12.2596140

1 August 2021 Low power requirement photoconductive antenna detectors based on a perfectly absorbing metasurfaces

Lucy Hale, Charles T. Harris, Ting Shan Luk, Sadhvikas J. Addamane, John L. Reno, Igal Brener, Oleg Mitrofanov

Proceedings Volume 11827, Terahertz Emitters, Receivers, and Applications XII; 118270P (2021) https://doi.org/10.1117/12.2596140
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

Here we present a photoconductive antenna (PCA) detector based on a novel perfectly absorbing, all-dielectric metasurface design. The metasurface consists of interconnected LT-GaAs channels, and supports degenerate electric and magnetic dipole modes that are critically coupled to the incident field. By replacing the photoconductive region in a THz PCA with this metasurface, full absorption of the optical pump beam is achieved in an ultra-thin photoconductive layer of only 160 nm. By maximizing absorption, high signal-to-noise is achieved at extremely low pump powers (below 100 μW). The saturation power is measured to be only 150 μW – an order of magnitude lower than typical PCA detectors. These highly efficient PCA detectors are applicable to a wide range of THz spectroscopy and imaging systems, particularly those where low power operation is required such as detector arrays and cryogenic environments.

Conference Presentation

Citation Download Citation

Lucy Hale, Charles T. Harris, Ting Shan Luk, Sadhvikas J. Addamane, John L. Reno, Igal Brener, and Oleg Mitrofanov "Low power requirement photoconductive antenna detectors based on a perfectly absorbing metasurfaces", Proc. SPIE 11827, Terahertz Emitters, Receivers, and Applications XII, 118270P (1 August 2021); https://doi.org/10.1117/12.2596140

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