Compact terahertz spectrometer based on a metasurface

Wenye Ji; Jin Chang; Behnam Mirzaei; Marcel Ridder; Willem Jellema; Wilt Kao; Alan Lee; Jian Rong Gao; Paul P. Urbach; Aurèle J. L. Adam

doi:10.1117/12.3021392

17 August 2024 Compact terahertz spectrometer based on a metasurface

Wenye Ji, Jin Chang, Behnam Mirzaei, Marcel Ridder, Willem Jellema, Wilt Kao, Alan Lee, Jian Rong Gao, Paul P. Urbach, Aurèle J. L. Adam

Author Affiliations +

Proceedings Volume PC13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; PC131020I (2024) https://doi.org/10.1117/12.3021392
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

We design, fabricate, and measure a novel spectrometer based on meta-surface structures, aiming to optimize its spectroscopic resolution within a band from 1.7 to 2.5 THz. The latter corresponds to a bandwidth of 38%, being comparable with a grating spectrometer. The meta-surfaces apply unit cells that consist of double-anchor structures based on gold, polyimide and gold triple layers. Several quantum cascade lasers that operate at slightly different frequencies around 2.1 THz were used to validate the spectrometer. We have measured a resolving power R of 273 and an efficiency of 78 %. Our results demonstrate for the first time a centimeter-sized, light weight FIR spectrometer with a promising resolution, which has potential to replace the half meter-sized, heavy grating based spectrometers in this wavelength band.

Conference Presentation

Citation Download Citation

Wenye Ji, Jin Chang, Behnam Mirzaei, Marcel Ridder, Willem Jellema, Wilt Kao, Alan Lee, Jian Rong Gao, Paul P. Urbach, and Aurèle J. L. Adam "Compact terahertz spectrometer based on a metasurface", Proc. SPIE PC13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, PC131020I (17 August 2024); https://doi.org/10.1117/12.3021392

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