| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 08 August 2011
Revised: 23 September 2011
Accepted manuscript online:
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PACS:
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78.66.Fd
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(III-V semiconductors)
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78.67.Hc
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(Quantum dots)
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73.21.-b
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(Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)
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| Fund: 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). |
Corresponding Authors:
Duan Su-Qing,duan_suqing@iapcm.ac.cn
E-mail: duan_suqing@iapcm.ac.cn
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Cite this article:
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 2012 Chin. Phys. B 21 037804
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