Ramezani Hamidreza, Li Hao-Kun, Wang Yuan, Zhang Xiang
NSF Nanoscale Science and Engineering Center, University of California, Berkeley, California 94720, USA.
NSF Nanoscale Science and Engineering Center, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Phys Rev Lett. 2014 Dec 31;113(26):263905. doi: 10.1103/PhysRevLett.113.263905. Epub 2014 Dec 30.
We propose a class of spectral singularities emerging from the coincidence of two independent singularities with highly directional responses. These spectral singularities result from resonance trapping induced by the interplay between parity-time symmetry and Fano resonances. At these singularities, while the system is reciprocal in terms of a finite transmission, a simultaneous infinite reflection from one side and zero reflection from the opposite side can be realized.
我们提出了一类由两个具有高度定向响应的独立奇点重合而产生的光谱奇点。这些光谱奇点是由宇称时间对称性和法诺共振之间的相互作用引起的共振俘获导致的。在这些奇点处，虽然系统在有限传输方面是互易的，但可以实现从一侧的同时无限反射和从另一侧的零反射。
