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Frequency-sensitive switching control effect induced by two-photon resonance in an EIT-based layered medium

Authors

  • Teh-Chau Liau,

    1. Ph. D. Program in Engineering Science, College of Engineering, Chung Hua University, Hsinchu, Taiwan, Republic of China
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  • Jian Qi Shen,

    Corresponding author
    1. Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentations, East Building No. 5, Zijingang Campus, Zhejiang University, Hangzhou, The People's Republic of China
    • Ph. D. Program in Engineering Science, College of Engineering, Chung Hua University, Hsinchu, Taiwan, Republic of China
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  • Yao-Huang Kao,

    1. Department of Communication Engineering, Chung Hua University, Hsinchu, Taiwan, Republic of China
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  • Tzong-Jer Yang

    1. Department of Electrical Engineering, Chung Hua University, Hsinchu, Taiwan, Republic of China
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Corresponding author E-mail : jqshen@zju.edu.cn

Abstract

The optical response of an atomic vapor can be coherently manipulated by tunable quantum interference occurring in atomic transition processes. A periodic layered medium whose unit cells consist of a dielectric and an EIT (electromagnetically induced transparency) atomic vapor is designed for light propagation manipulation. Such an EIT-based periodic layered medium exhibits a flexible frequency-sensitive optical response, where a very small change in probe frequency can lead to a drastic variation of reflectance and transmittance. As the destructive quantum interference relevant to two-photon resonance arises in EIT atoms interacting with both control and probe fields, the controllable optical processes that depend sensitively on the external control field will take place in this EIT-based periodic layered medium. Such a frequency-sensitive and field-controlled optical behavior of reflection and transmission in the EIT photonic crystal can be applicable to designs of new devices such as photonic switches, photonic logic gates and photonic transistors, where one laser field can be controlled by the other one, and would have potential applications in the areas of integrated optical circuits and other related techniques (e.g., all-optical instrumentations).

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