Abstract
We present a simple yet effective approach to realize all-optical diode (AOD) based on an asymmetric nanocavity–waveguide (WG) structure. We show that by adjusting the distance between the nonlinear nanocavity and its surrounding rods, the transmission characteristics of the input and output WGs (which are equivalent to two F–P cavities with different lengths) can be precisely tuned, and as a result, the coupling strengths between the nanocavity and its connected WGs become quite different. This makes the excitation of the bistable state inside cavity is sensitive to the launching direction of the signal light, and makes the nonreciprocal transmission of the signal light possible. In this way, the maximum transmission contrast over 20dB can be achieved for either forward or backward conducted AOD, with a broad operation bandwidth over 5 nm. The approach proposed here is promising in the fields of advanced photonic circuits, all-optical information processing, and optical communications.
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