Graphene based All-Optical Spatial Terahertz Modulator

被引：0
作者：
Qi-Ye Wen
Wei Tian
Qi Mao
Zhi Chen
Wei-Wei Liu
Qing-Hui Yang
Matthew Sanderson
Huai-Wu Zhang
机构：
[1] State Key Laboratory of Electronic Films and Integrated Devices,
[2] University of Electronic Science and Technology of China,undefined
[3] National Key Laboratory of Science and Technology of Communication. University of Electronic Science and Technology of China,undefined
[4] Institute of Modern Optics,undefined
[5] Nankai University,undefined
[6] Key Laboratory of Optical Information Science and Technology,undefined
[7] Ministry of Education,undefined
[8] School of Physics,undefined
[9] University of Wollongong,undefined
来源：
Scientific Reports | / 4卷
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摘要：
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. A spectrally 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.
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[1]  
Chen HT(2006)Active terahertz metamaterial devices Nature 444 597-600
[2]  
Chan WL(2009)A spatial light modulator for terahertz beams Appl. Phys. Lett. 94 213511-9975
[3]  
Kleine-Ostmann T(2004)Room-temperature operation of an electrically driven terahertz modulator Appl. Phys. Lett. 84 3555-17509
[4]  
Dawson P(2011)High speed terahertz modulation from metamaterials with embedded high electron mobility transistors Opt. Express 19 9968-337
[5]  
Pierz K(2007)Ultrafast Optical Switching of Terahertz Metamaterials Fabricated on ErAs/GaAs Nanoisland Superlattices Opt. Lett. 32 1620-28667
[6]  
Hein G(2010)Tuning the resonance in high-temperature superconducting terahertz metamaterials Phys. Rev. Lett. 105 247402-12518
[7]  
Koch M(2010)Low loss and magnetic field-tunable superconducting terahertz metamaterial Opt. Express 18 17504-634
[8]  
Shrekenhamer D(2010)Terahertz metamaterials with VO Appl. Phys. Lett. 97 021111-67
[9]  
Chen HT(1991) cut-wires for thermal tunability Infrared Phys. 32 1-5269
[10]  
Chen HT(1992)Amplitude-, phase- and frequency modulation of far-infrared radiation by optical excitation of silicon Appl. Opt. 31 329-7
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