Dual-frequency asynchronous optical switch with three-bit encoder

Abstract SPPs valuable for applications in biosensing, environmental monitoring, and various other fields.We design a two-bit encoder grounded in the Plasmon-induced Transparency (PIT) phenomenon. The structure produces the PIT effect by interfering with the combination of two graphene structures that produce a ‘light–dark’ pattern. Based on the optical properties of graphene, the dual-frequency asynchronous optical switch is designed. The modulation depth of the photonic device can attain up to 93%, which is crucial for enhancing the fidelity of optical signal transmission and improving the system’s signal-to-noise performance. Our structure can achieve a slow optical effect with a maximum group index of 535, which opens up a new way for the development of new photonic devices such as optical memory and optical cache. This research introduces an innovative concept for exploring encoders and slow optical devices, advancing the evolution of optical technology towards greater efficiency and enhanced integration.