报告时间：12月6日 周四 下午3:00
报告题目： Non-reciprocal photonic devices based on optomechanical microresonator
Non-reciprocal devices, which allow non-reciprocal signal routing, serve as fundamental elements in photonic and microwave circuits and are crucial in both classical and quantum information processing. Optical circulators, isolators, directional amplifiers, etc. are typical non-reciprocal devices. The most common optical non-reciprocal devices are based on the Faraday effects using magneto-optical materials, which are difficult to integrate on-chip. Therefore, in recent years, interest has increased in realizing on-chip all-optical circulators, isolators, and directional amplifiers. The radiation-pressure-induced coupling between light and mechanical motion in travelling-wave resonators has been exploited to break the Lorentz reciprocity, enabling non-reciprocal devices without magnetic materials. Here, we experimentally demonstrate a reconfigurable non-reciprocal device with alternative functions as either a circulator or a directional amplifier via optomechanically induced coherent photon–phonon conversion or gain. The demonstrated device exhibits considerable flexibility and offers exciting opportunities for combining reconfigurability, non-reciprocity and active properties in single photonic devices, which can also be generalized to microwave and acoustic circuits.