Phase dependence of cross-phase modulation in asymmetric quantum wells |
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| Authors: | Yihong Qi Yueping Niu Helin Wang |
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| Institution: | a State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, Chinab Graduate University of Chinese Academy of Sciences, Beijing 100049, Chinac College of Computer Science and Technology, Henan Polytechnic University, Jiaozuo 454000, Chinad College of Science, Zhejiang University of Technology, Hangzhou 310032, China |
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| Abstract: | We study the Kerr nonlinearity associated with cross-phase modulation based on electromagnetically induced transparency in asymmetric double quantum wells. It is shown that, different from atomic system, not only the nonlinear dispersion and absorption but also the linear absorption depends on the relative phase of the laser fields because of the Fano interference. By choosing the parameters appropriately, large cross-phase modulation with nearly vanishing two-photon absorption, even π phase shift with single photon level, could be achieved in the asymmetric quantum wells. |
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| Keywords: | Asymmetric double quantum well Cross-phase modulation (XPM) Electromagnetically induced transparency (EIT) |
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