Realization of double Fano resonances with a InSb-doped Fabry-Perot cavity

Abstract

In this paper, a one-dimensional photonic structure is proposed for the realization of double Fano resonance (DFaR), which can be tuned by an external magnetic field and temperature. The designed photonic structure is composed of a Fabry-Perot cavity based on semiconductor material indium antimonide (InSb) and a sequence of general photonic crystals. A single Fano resonance (SFaR) is generated by the Fabry-Perot cavity, and the ordinary photonic crystals added to the back of the Fabry-Perot cavity offer a continuous transmission spectrum as a continuous state. The appearance of DFaR is ascribed to the interference phenomenon between SFaR and the continuous state. The effect of different parameters on Fano resonance was simulated by the transfer matrix method. The simulation results show that the interaction of the SFaR with the continuum spectrum leads to a new Fano resonance (NFaR) with a higher quality factor. Furthermore, DFaR can have the function of multi-physics tuning, controlled by the external magnetic field and temperature for the amplitude and frequency point of transmittance due to the introduction of InSb material. Based on the characteristics of DFaR, these obtained results can provide ideas for designing multi-measuring optical filters, lasers, slow light devices, and multi-node optical switches.