Photonic bandgap via nonlinear modulation assisted by spontaneously generated coherence |
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Authors: | Yin-Ping Yao Tong-Yi Zhang Jun Kou Ren-Gang Wan |
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Institution: | 1. State Key Laboratory of Transient Optics and Photonics, Xi?an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi?an 710119, PR China;2. Quantum Engineering Center, Beijing Institute of Control Device, Beijing 100854, PR China |
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Abstract: | A four-level double-ladder atomic system with two upper states coupled to the excited state by a standing-wave trigger field is explored to generate photonic bandgap (PBG) structure. With the assistance of spontaneously generated coherence (SGC) from the two decay pathways, we can obtain single or double fully developed PBG when the trigger field is far away from resonance or resonant. While in the absence of SGC, the atomic medium becomes strong absorptive to the probe field, and therefore the resulting PBGs are severely malformed or even cannot be opened up. Numerical results show that the PBG structure is originated from the third-order cross Kerr nonlinear modulation between the probe and trigger fields. This mechanism differs from the recent schemes based on linear modulation. |
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Keywords: | Spontaneously generated coherence Photonic bandgap Nonlinear modulation |
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