International Journal of Terahertz Science and Technology
  TST >> Vol.7, No.1, March 2014: PP. 39-52
 

(Invited paper) Optical couplers for terahertz quantum well photodetectors

R. Zhang, X. G. Guo, and J. C. Cao *
Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China
* Email: jccao@mail.sim.ac.cn

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Abstract: Constrained by the intersubband transition selection rule, terahertz (THz) quantum well photodetectors (QWPs) are insensitive to the normally incident light. On the other hand, the intersubband absorption efficiency of THz QWPs is relatively low due to the low doping concentrations in the quantum wells. To solve these issues, optical couplers including the metal-grating coupler, the micro-cavity coupler, and the surface-plasmon coupler, are introduced and investigated. Our findings show that, with these high efficient optical couplers, the performance of THz QWPs can be greatly improved.

Keywords: Coupler, Pphotodetector, Quantum well, Terahertz.

Received: 2013-11-25

Published: 2014-3-31

Acknowledgments: This work was supported by the 973 Program of China (Grant No. 2014CB339803), the 863 Program of China (Project No. 2011AA010205), the National Natural Science Foundation of China (Grant Nos. 61131006, 61321492, 61176086, and 61306066), the Major National Development Project of Scientific Instrument and Equipment (Grant No. 2011YQ150021), the Important National Science and Technology Specific Projects (Grant No. 2011ZX02707), the major project (Project No. YYYJ-1123-1) and the International Collaboration and Innovation Program on High Mobility Materials Engineering of the Chinese Academy of Sciences, and the Shanghai Municipal Commission of Science and Technology (Project Nos. 11ZR1444200, 13ZR1464600).

Cite this article:
R. Zhang, X. G. Guo, and J. C. Cao.(Invited paper) Optical couplers for terahertz quantum well photodetectors[J]. International Journal of Terahertz Science and Technology, 2014, Vol.7, No.1: 39-52.  DOI:10.11906/TST.039-052.2014.03.04

URL: http://www.tstnetwork.org/10.11906/TST.039-052.2014.03.04

 

 
 

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