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- Title
Graphene based All-Optical Spatial Terahertz Modulator.
- Authors
Qi-Ye Wen; Wei Tian; Qi Mao; Zhi Chen; Wei-Wei Liu; Qing-Hui Yang; Sanderson, Matthew; Huai-Wu Zhang
- Abstract
We demonstrate an all-optical terahertz modulator based on single-layer graphene on germanium (GOG), which can be driven by a 1.55 μm CW laser with a low-level photodoping power. Both the static and dynamic THz transmission modulation experiments were carried out. Aspectrally wide-band modulation of the THz transmission is obtained in a frequency range from 0.25 to 1 THz, and a modulation depth of 94% can be achieved if proper pump power is applied. The modulation speed of the modulator was measured to be, ℘200 KHz using a 340 GHz carrier. A theoretical model is proposed for the modulator and the calculation results indicate that the enhanced THz modulation is mainly due to the third order nonlinear effect in the optical conductivity of the graphene monolayer.
- Subjects
OPTICAL properties of graphene; OPTICAL properties of germanium; OPTICAL conductivity; VELOCITY modulation; SPATIAL ability
- Publication
Scientific Reports, 2014, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep07409