Dispersive properties of tunnelling-induced transparency in an asymmetric double quantum well
Su Xue-Mei (苏雪梅)abc, Zhuo Zhong-Chang (卓仲畅)a, Wang Li-Jun (王立军)bc, Gao Jin-Yue (高锦岳)a
a Department of Physics, Jilin University, Chuangchun 130023, China; b Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130021, China; c Laboratory of Excited State Process, Chinese Academy of Sciences, Changchun 130021, China
Abstract We have investigated the dispersive properties of tunnelling-induced transparency in asymmetric double quantum well structures where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands. The intersubband transitions exhibit high dispersion at zero absorption, which leads to the slow light velocity in this medium as compared with that in vacuum (c=3×108). The group velocity in a specific GaAs/AlGaAs sample is calculated to be vg=c/4.30. This structure can be used to compensate for the dispersion and energy loss in fibre optical communications.
Received: 09 April 2002
Accepted manuscript online:
(Clean metal, semiconductor, and insulator surfaces)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10074021 and 6007815) and by the Doctoral Programme Foundation of Institution of Higher Education China (Grant No 19201038).
Cite this article:
Su Xue-Mei (苏雪梅), Zhuo Zhong-Chang (卓仲畅), Wang Li-Jun (王立军), Gao Jin-Yue (高锦岳) Dispersive properties of tunnelling-induced transparency in an asymmetric double quantum well 2002 Chinese Physics 11 1175
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