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Cao, Qi-Tao; Wang, Heming; Dong, Chun-Hua; Jing, Hui; Liu, Rui-Shan; Chen, Xi; Ge, Li; Gong, Qihuang; Xiao, Yun-Feng
Physical review letters, 2017-Jan-20, Letnik: 118, Številka: 3Journal Article
Chirality is an asymmetric property widely found in nature. Here, we propose and demonstrate experimentally the spontaneous emergence of chirality in an on-chip ultrahigh-Q whispering-gallery microresonator, without broken parity or time-reversal symmetry. This counterintuitive effect arises due to the inherent Kerr-nonlinearity-modulated coupling between clockwise and counterclockwise propagating waves. Above an input threshold of a few hundred microwatts, the initial chiral symmetry is broken spontaneously, and the counterpropagating output ratio exceeds 20∶1 with bidirectional inputs. The spontaneous chirality in an on-chip microresonator holds great potential in studies of fundamental physics and applied photonic devices.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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