Instrumentation, Techniques, and Measurement

Investigation of terahertz surface plasmon modulation with optical injection of free carriers

[+] Author Affiliations
Tao Yang

Nanjing University of Posts and Telecommunications, Institute of Advanced Materials, Nanjing 210023, Jiangsu, China

University of Exeter, School of Physics, Exeter EX4 4QL, United Kingdom

Rayko Stantchev

University of Exeter, School of Physics, Exeter EX4 4QL, United Kingdom

Yuan Zhou, Wei Huang

Nanjing University of Posts and Telecommunications, Institute of Advanced Materials, Nanjing 210023, Jiangsu, China

Hopui Ho

The Chinese University of Hong Kong, Department of Electronic Engineering, Hong Kong, China

Yongyuan Zhu, Yiqiang Qin

Nanjing University, National Laboratory of Solid State Microstructures, Nanjing 210093, Jiangsu, China

Opt. Eng. 55(6), 064109 (Jun 20, 2016). doi:10.1117/1.OE.55.6.064109
History: Received March 18, 2016; Accepted May 31, 2016
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Abstract.  Optical modulation of terahertz surface plasmon polaritons (THz SPPs) propagating in an intrinsic indium antimonide surface is demonstrated in this paper. The modulation is mediated by the modification of free carrier density with optical illumination. Simulation and experimental results show that a THz modulator can be realized by tuning the propagation lengths of THz SPPs, which could be controlled to be larger or shorter than the distance of two razor blades used for the coupling of the THz wave and the THz SPPs. In comparison with conventional THz modulation approaches, this method of manufacturing is simpler and the switching bandwidth is wider. The maximum modulation frequency of the modulators is anticipated to be above gigahertz, thus leading to the possibility of communication applications using the THz baseband.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Tao Yang ; Rayko Stantchev ; Yuan Zhou ; Hopui Ho ; Yongyuan Zhu, et al.
"Investigation of terahertz surface plasmon modulation with optical injection of free carriers", Opt. Eng. 55(6), 064109 (Jun 20, 2016). ; http://dx.doi.org/10.1117/1.OE.55.6.064109


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