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Journal Articles Optics Letters Year : 2016

Photo-generated metasurfaces for resonant and high modulation of terahertz signals

Abstract

We theoretically demonstrate a resonant modulation of THz waves with photo-designed metasurfaces. Our approach bypasses the issue of the short penetration length of the optical pump which prevents to photogenerate thick metamaterials. We propose a three layers semiconductor system of subwavelength thickness that presents a 100% modulation of the reflection (or absorption) spectra around 1 THz when it is optically actuated. This resonant modulation can be dynamically monitored at high frequency rate by the optical pump on broad range of frequencies of Δν/ν = 100%. Finally, appropriate 2D photo-printed patterns make the system polarization insensitive and operational for a wide range of incident angles up to 65° .
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Dates and versions

hal-04287213 , version 1 (17-11-2023)

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Rafik Smaali, Thierry Taliercio, E Centeno. Photo-generated metasurfaces for resonant and high modulation of terahertz signals. Optics Letters, 2016, 41 (16), pp.3900-3903. ⟨10.1364/ol.41.003900⟩. ⟨hal-04287213⟩
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