Enhancing sensing performance through a metal-dielectric hybrid structure supporting hybridized TPP and...

We propose a metal-dielectric hybrid structure to enhance the quality (Q) factor by strong coupling between the resonant guided mode (RGM) and higher-order Tamm plasmon polariton (TPP). Meanwhile, we found that symmetry-protected bound states in the continuum (SP-BIC) can be achieved by actively adjusting the angle of the incident light, thus increasing the degrees of freedom for modulating the Q-factor. The simulation results indicated that both the central wavelengths and Q-factors of resonant modes can be modulated and optimized by modifying relevant structural parameters. Furthermore, we theoretically investigated the potential application of this structure as a dual-band self-referencing sensor, achieving the sensitivity (S) of up to 987.5 nm/RIU and 1237.5 nm/RIU while increasing the Q-factor to 923.79 and 542.73. Our work presents a promising opportunity to enhance the Q-factor while maintaining high S in lossy sensing systems.