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摘要
Photonic devices based on a high-Q cavity are commonly constrained by narrow operation bandwidth, slow charging, and releasing speed. Here, we analytically and numerically demonstrate that this limitation can be broken via dynamically tuning the Q factors of a single nanocavity and driving controllable photonic transitions between a low-Q cavity mode and an ultrahigh-Q mode by temporal refractive index modulations inside a multimode cavity. During this dynamic process, the bandwidth of signal light is also reversibly compressed. As a result, the fundamental link between the photon lifetime and the operation bandwidth is broken, and a delay-bandwidth product of similar to 76 is achieved, which is far greater than that of the usual optical resonator systems. This approach may pave the way for dynamic control of on-chip all-optical information processing.
- 出版日期2018-8-15
- 单位华南理工大学
