Tunable polarization-independent broadband absorber in the terahertz regime

Xingzhe Shi; Yuanfu Lu; Changshui Chen; Songhao Liu; Guangyuan Li

doi:10.1117/12.2537677

18 November 2019 Tunable polarization-independent broadband absorber in the terahertz regime

Xingzhe Shi, Yuanfu Lu, Changshui Chen, Songhao Liu, Guangyuan Li

Proceedings Volume 11196, Infrared, Millimeter-Wave, and Terahertz Technologies VI; 111960G (2019) https://doi.org/10.1117/12.2537677
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

Here we report a tunable polarization-independent broadband absorber in the terahertz regime. The proposed structure consists of periodic all-dielectric array on a gold substrate, sandwiched by a monolayer graphene and an epsilon-near-zero layer. Simulation results show that the absorption that is independent from the incident polarization remains above 90% over a broadband spectral range from 1.6 THz to 4.1 THz, corresponding to a bandwidth of 2.5 THz and a relative bandwidth of 87.7%. By varying the graphenes Fermi energy from 0.2 eV to 0.5 eV, the absorption bandwidth can be turned from 1.5 THz to 2.5 THz. We expect this polarization- independent absorber with dynamically tunable bandwidth can be used a filters in applications such as terahertz detectors.

Citation Download Citation

Xingzhe Shi, Yuanfu Lu, Changshui Chen, Songhao Liu, and Guangyuan Li "Tunable polarization-independent broadband absorber in the terahertz regime", Proc. SPIE 11196, Infrared, Millimeter-Wave, and Terahertz Technologies VI, 111960G (18 November 2019); https://doi.org/10.1117/12.2537677

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