Nonreciprocal optical router with spinning microcavity exciton polaritons

Abstract We provide a theoretical proposal to achieve nonreciprocal optical routers based on a spinning microcavity exciton polariton system coupled to a tapered fiber. The mechanism for routers is revealed by nonreciprocal optomechanically induced transparency, which is obtained by transmission spectra and nonreciprocal isolate rates. Due to Sagnac effects, the transmission of photon signals along clockwise and counterclockwise directions exhibits distinct characteristics at a special frequency, resulting in clockwise or counterclockwise unidirectional transmission. Therefore, in such nonreciprocal routers, the transmission direction, output frequency, and output intensity for photon signals can be precisely controlled by adjusting Sagnac effects, pump fields, and the coupling of photon, phonon, and exciton modes. Moreover, the vacuum and thermal noise of the system cannot deteriorate the router performance. Our results open new pathways for constructing nonreciprocal optical routers, which may be useful for developing quantum networks and integrated photonic circuits.