Trapping light in the continuum-from fantasy to reality

• 作者: Chao Peng
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2020,（18）
• 页码范围: 1527-1532
• 页数: 6页
• 语种: 英文

摘要

Trapping light without absorbing it is of great importance for both science and technology.A conventional way for trapping light is to use some kind of reflecting surface or region, namely a mirror,to forbid light escaping.Following this key concept, various optical resonators had been demonstrated, such as whispering-gallery mode cavity, photonic crystal defect cavity, micro-ring resonator,etc.Differently, recent researches revealed that, perfect trapping of light can still be realized even out-going waves are allowed;or equivalently saying, discrete, localized, bound state with infinite lifetime can exist in the continuous spectrum of extended states.