Electrically controlled terahertz spatial light modulators with graphene arrays
Ozkan, V. A.
Polat, E. O.
IEEE MTT-S International Microwave Symposium Digest
Institute of Electrical and Electronics Engineers Inc.
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Please cite this item using this persistent URLhttp://hdl.handle.net/11693/37716
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 5×5 arrays of graphene modulator with 65% modulation between 0.1 to 1.5 THz.
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