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Article Dans Une Revue Optics Express Année : 2024

Broadband high-contrast-grating-type waveplates for the terahertz range

Résumé

The high-contrast-grating waveplates utilizing high contrast between silicon and air refractive indexes were developed in order to perform as a quarter wave and a half wave plate in the selected THz frequency range. The waveplates possessed anti-reflective properties due to the specific inclination of the walls both in parallel and in perpendicular direction to grating axis, efficiently suppressing the reflection losses caused by air-dielectric interface for both transverse magnetic and transverse electric polarizations. Moreover, significant reduction of the transmittance gap was achieved between both polarizations while mitigating overall Fabry-Perot effect. Validation of the concepts was carried out by measuring transmission amplitude and phase spectra of the fabricated samples in a broadband of THz time-domain spectroscopy and vector-network-analysis systems considering also some real applications.
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hal-04569540 , version 1 (06-05-2024)

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Surya Revanth Ayyagari, Andreas K Klein, Simonas Indrišiūnas, Vytautas Janonis, Daniil Pashnev, et al.. Broadband high-contrast-grating-type waveplates for the terahertz range. Optics Express, 2024, Optics Express, 32 (9), pp.15870-15881. ⟨10.1364/oe.521532⟩. ⟨hal-04569540⟩
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