黄殷

副教授 硕士生导师

入职时间:2013-07-01

所在单位:物理与电子学院

学历:博士研究生毕业

性别:男

学位:博士学位

在职信息:在职

毕业院校:美国路易斯安那州立大学

学科:电子科学与技术

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2017年论文发表

发布时间:2020-04-25

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Our paper "Switching of the direction of reflectionless light propagation at exceptional points in non-PT-symmetric structures using phase-change materials" by Yin Huang*, Yuecheng Shen, Changjun Min, and Georgios Veronis is accepted in Optics express.


Abstract: We introduce a non-parity-time-symmetric three-layer structure, consisting of a gain medium layer sandwiched between two phase-change medium layers for switching of the direction of reflectionless light propagation. We show that for this structure unidirectional reflectionlessness in the forward direction can be switched to unidirectional reflectionlessness in the backward direction at the optical communication wavelength by switching the phase-change material Ge2Sb2Te5 (GST) from its amorphous to its crystalline phase. We also show that it is the existence of exceptional points for this structure with GST in both its amorphous and crystalline phases which leads to unidirectional reflectionless propagation in the forward direction for GST in its amorphous phase, and in the backward direction for GST in its crystalline phase. Our results could be potentially important for developing a new generation of compact active free-space optical devices.


 







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