Photoconductive metasurfaces for near-field terahertz sources and detectors

Lucy Hale; Hyunseung Jung; James Seddon; Raktim Sarma; Sylvain D. Gennaro; Jayson Briscoe; C. Thomas Harris; Ting Shan Luk; Prasad Iyer; Sadhvikas J. Addamane; John L. Reno; Igal Brener; Oleg Mitrofanov

doi:10.1117/12.2681721

4 October 2023 Photoconductive metasurfaces for near-field terahertz sources and detectors

Lucy Hale, Hyunseung Jung, James Seddon, Raktim Sarma, Sylvain D. Gennaro, Jayson Briscoe, C. Thomas Harris, Ting Shan Luk, Prasad Iyer, Sadhvikas J. Addamane, John L. Reno, Igal Brener, Oleg Mitrofanov

Author Affiliations +

Proceedings Volume 12683, Terahertz Emitters, Receivers, and Applications XIV; 126830C (2023) https://doi.org/10.1117/12.2681721
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Aperture near-field microscopy and spectroscopy (a-SNOM) enables the direct experimental investigation of subwavelength-sized resonators by sampling highly confined local evanescent fields on the sample surface. Despite its success, the versatility and applicability of a-SNOM is limited by the sensitivity of the aperture probe, as well as the power and versatility of THz sources used to excite samples. Recently, perfectly absorbing photoconductive metasurfaces have been integrated into THz photoconductive antenna detectors, enhancing their efficiency and enabling high signal-to-noise ratio THz detection at significantly reduced optical pump powers. Here, we discuss how this technology can be applied to aperture near-field probes to improve both the sensitivity and potentially spatial resolution of a-SNOM systems. In addition, we explore the application of photoconductive metasurfaces also as near-field THz sources, providing the possibility of tailoring the beam profile, polarity and phase of THz excitation. Photoconductive metasurfaces therefore have the potential to broaden the application scope of aperture near-field microscopy to samples and material systems which currently require improved spatial resolution, signal-to-noise ratio, or more complex excitation conditions.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lucy Hale, Hyunseung Jung, James Seddon, Raktim Sarma, Sylvain D. Gennaro, Jayson Briscoe, C. Thomas Harris, Ting Shan Luk, Prasad Iyer, Sadhvikas J. Addamane, John L. Reno, Igal Brener, and Oleg Mitrofanov "Photoconductive metasurfaces for near-field terahertz sources and detectors", Proc. SPIE 12683, Terahertz Emitters, Receivers, and Applications XIV, 126830C (4 October 2023); https://doi.org/10.1117/12.2681721

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