Graphene-enabled electrically controlled terahertz spatial light modulators
Date
2015-05-01
Authors
Kakenov, N.
Takan, T.
Ozkan, V. A.
Balcı, O.
Polat, E. O.
Altan, H.
Kocabas, C.
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Optics Letters
Print ISSN
0146-9592
Electronic ISSN
Publisher
Optical Society of America
Volume
40
Issue
9
Pages
1984 - 1987
Language
English
Type
Journal Title
Journal ISSN
Volume Title
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Abstract
In this Letter, we demonstrate a broadband terahertz (THz) spatial light modulator using 5×5 arrays of large area graphene supercapacitors. Our approach relies on controlling spatial charge distribution on a passive matrix array of patterned graphene electrodes. By changing the voltage bias applied to the rows and columns, we were able to pattern the THz transmittance through the device with high modulation depth and low operation voltage. We anticipate that the simplicity of the device architecture with high contrast THz modulation over a broad spectral range could provide new tools for THz imaging and communication systems.