Terahertz wave generation in coupled quantum dots

doi:10.1088/1674-1056/21/3/037804

中国物理B ›› 2012, Vol. 21 ›› Issue (3): 37804-037804.doi: 10.1088/1674-1056/21/3/037804

马玉蓉¹,郭世方²,段素青²

收稿日期:2011-08-08 修回日期:2011-09-23 出版日期:2012-02-15 发布日期:2012-02-15
通讯作者: 段素青,duan_suqing@iapcm.ac.cn E-mail:duan_suqing@iapcm.ac.cn

Terahertz wave generation in coupled quantum dots

Ma Yu-Rong(马玉蓉)^a), Guo Shi-Fang(郭世方)^b), and Duan Su-Qing(段素青)^b)^†

a. Beijing Vocational College of Electronic Science, Beijing 100176, China;
b. Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

Received:2011-08-08 Revised:2011-09-23 Online:2012-02-15 Published:2012-02-15
Contact: Duan Su-Qing,duan_suqing@iapcm.ac.cn E-mail:duan_suqing@iapcm.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10874020 and 11074025) and the National Basic Research Program of China (Grant No. 2011CB922204).

摘要/Abstract

Abstract: Based on coupled quantum dots, we present an interesting optical effect in a four-level loop coupled system. Both the two upper levels and the two lower levels are designed to be almost degenerate, which induces a considerable dipole moment. The terahertz wave is obtained from the low-frequency component of the photon emission spectrum. The frequency of the terahertz wave can be controlled by tuning the energy levels via designing the nanostructure appropriately or tuning the driving laser field. A terahertz wave with adjustable frequency and considerable intensity (100 times higher than that of the Rayleigh line) can be obtained. It provides an effective scheme for a terahertz source.

Key words: coupled quantum dot, terahertz wave

中图分类号: (III-V semiconductors)

78.66.Fd

78.67.Hc (Quantum dots) 73.21.-b (Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)

马玉蓉, 郭世方, 段素青. [J]. 中国物理B, 2012, 21(3): 37804-037804.

Ma Yu-Rong(马玉蓉), Guo Shi-Fang(郭世方), and Duan Su-Qing(段素青) . Terahertz wave generation in coupled quantum dots[J]. Chin. Phys. B, 2012, 21(3): 37804-037804.

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Terahertz wave generation in coupled quantum dots

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