Electrically controlled terahertz spatial light modulators with graphene arrays

Date
2016
Advisor
Instructor
Source Title
Proceedings of the IEEE MTT-S International Microwave Symposium, IMS 2016
Print ISSN
0149-645X
Electronic ISSN
Publisher
IEEE
Volume
Issue
Pages
Language
English
Type
Conference Paper
Journal Title
Journal ISSN
Volume Title
Abstract

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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Book Title
Keywords
Active THz devices, Graphene, THz modulator, Chemical vapor deposition, Electromagnetic waves, Ionic liquids, Light modulation, Modulators
Citation
Published Version (Please cite this version)