Optical isolation based on space-time engineered asymmetric photonic band gaps

Article

关键词: FREE NON-RECIPROCITY;    PERIODIC MEDIA;    DISPERSION-RELATIONS;    ACTIVE CIRCULATORS;    SILICON PHOTONICS;    WAVE-GUIDE;    METASURFACE;    DIODE;    LIMITATIONS;    GRATINGS;   

DOI  :  10.1103/PhysRevB.96.155409

来源: SCIE

【 摘 要 】

Nonreciprocal electromagnetic devices play a crucial role in modern microwave and optical technologies. Conventional methods for realizing such systems are incompatible with integrated circuits. With recent advances in integrated photonics, the need for efficient on-chip magnetless nonreciprocal devices has become more pressing than ever. This paper leverages space-time engineered asymmetric photonic band gaps to generate optical isolation. It shows that a properly designed space-time modulated slab is highly reflective/transparent for opposite directions of propagation. The corresponding design is magnetless, accommodates low modulation frequencies, and can achieve very high isolation levels. An experimental proof of concept atmicrowave frequencies is provided.

【 授权许可】

Free