Electrically controlled terahertz spatial light modulators with graphene arrays

Date

2016-05-27

Author

Kakenov, Nurbek
Takan, Taylan
Özkan, Vedat Ali
Balci, Osman
Polat, Emre O.
Altan, Hakan
KOCABAŞ, COŞKUN

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Gate-tunable high-mobility electrons on atomically thin graphene layers provide a unique opportunity to control electromagnetic waves in a very broad spectrum. In this paper, we describe an electrically-controlled multipixel terahertz light modulators. The spatial light modulator is fabricated using two large-area graphene layers grown by chemical vapor deposition and transferred on THz transparent and flexible substrates. Room temperature ionic liquid, inserted between the graphene, provides mutual gating between the graphene layers. We used passive matrix addressing to control local charge density thus the THz transmittance. With this device configuration, we were able to obtain 5x5 arrays of graphene modulator with 65% modulation between 0.1 to 1.5 THz.

Subject Keywords

Graphene, THz modulator, Active THz devices

URI

https://hdl.handle.net/11511/54963

Collections

Department of Physics, Conference / Seminar