Observation of Gate-Tunable Coherent Perfect Absorption of Terahertz Radiation in Graphene

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2016-09-01

Author

Kakenov, Nurbek
Balci, Osman
Takan, Taylan
ÖZKAN, VEDAT ALİ
Altan, Hakan
KOCABAŞ, COŞKUN

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We report experimental observation of electrically tunable coherent perfect absorption (CPA) of terahertz (THz) radiation in graphene. We develop a reflection-type tunable THz cavity formed by a large-area graphene layer, a metallic reflective electrode, and an electrolytic medium in between. Ionic gating in the THz cavity allows us to tune the Fermi energy of graphene up to 1 eV and to achieve a critical coupling condition at 2.8 THz with absorption of 99%. With the enhanced THz absorption, we were able to measure the Fermi energy dependence of the transport scattering time of highly doped graphene. Furthermore, we demonstrate flexible active THz surfaces that yield large modulation in the THz reflectivity with low insertion losses. We anticipate that the gate-tunable CPA will lead to efficient active THz optoelectronics applications.

Subject Keywords

Graphene, THz optoelectronics, Ionic gating, Terahertz, Gate-tunable, Coherent optical absorption

URI

https://hdl.handle.net/11511/43284

Journal

ACS PHOTONICS

DOI

https://doi.org/10.1021/acsphotonics.6b00240

Collections

Department of Physics, Article

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Citation Formats

N. Kakenov, O. Balci, T. Takan, V. A. ÖZKAN, H. Altan, and C. KOCABAŞ, “Observation of Gate-Tunable Coherent Perfect Absorption of Terahertz Radiation in Graphene,” ACS PHOTONICS, pp. 1531–1535, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43284.