Abstract
A paradigm for high-quality factor ) with a substantial fulfillment for appraising sensing ability and performance has been investigated. Through constructing a 1D (one-dimensional) topological photonic crystal (PhC) mirror heterostructure, which is formed by the image view of 1D topological PhC stacking with its original one. In the 1D topological PhC-mirror heterostructure, there is an interesting mode that appeared with the symmetric, typical Lorentzian-line shape with 100% transmittance in the topological mirror edge-state mode (hybrid resonance mode) at the heterostructure interface. Physically, such a mode is a defect mode, but the defect is introduced through topological operations. The high -factor of 5.08 × 104 is obtained due to the strong optical localization of the defect mode at the topological edge area. Consequently, this device acts as a narrow passband filter. Moreover, due to the narrow bandpass property, it may be an advantageous reference for many applications in filtering, switching, and sensing. Thus, introducing an electro-optical (EO) polymer layer at the interface to modify the edge defect can tune the defect mode both in frequency and -factor for higher spatial pulse compression and higher EO sensitivity. Accordingly, the -factor of the sensitivity of 616 nm/RIU, and the figure of merit of 49,677.42 RIU−1 are obtained. The sensing ability and performance are attributable to the strong optical localization in the interface region and enhanced light-matter interaction. We predict that the 1D topological PhC mirror heterostructure will be an outstanding point in the field of optical sensing, filters, and optical switching in different fields.
Highlights
photonic crystal (PhC) is shown in Figure 2b, from which the topological edge state is observed in the involved range between the second photonic bandgap (PBG) of PhC1 and the first one of PhC2
The zoom-in of the sharp peak of the topological edge state is shown in Figure 2c, and the dashed line shows the fitting curve, which is symmetric in the typical Lorentzian-line shape
The λc of the sharp transmission peak is exactly located at the interface point between the two PhCs, which can be shown by calculating the electric field distribution according to Figure 2d, indicating the existence of the topological edge state with the localized electric field around the topological PhC interface
Summary
Due to the advantages of sensor applications, optical sensors have gained remarkable interest and popularity as promising sensors due to their particular properties, for example, immunity to electromagnetic interference, high speed and remote sensing ability, long-distance monitoring, and fast response [13] Another feature that will be focused on which is generating hybrid resonance mode due to the strong optical localization of defect mode at the topological edge area. Our proposed structure is based on two 1D topological PhCs to realize the hybrid resonance mode due to the strong optical localization at the topological edge area with high sensor abilities. By an appropriate design of two-1D conventional PhC for possessing photonic-band gap (PBG) in the same range of frequencies to excite a topological edge state mode when the
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