This work demonstrates enhanced refractive index sensing using topological interface modes in photonic crystals, suggesting advanced applications in various fields.
Key Points
The aim is to enhance refractive index sensing using robust topological interface modes in novel photonic crystal structures.
Studied topological interface modes in one-dimensional all-dielectric photonic crystals of Si and SiO2
Implemented phase gradient cancellation strategy with centrosymmetric photonic crystal layers
Achieved localized and tunable defect modes by inserting defect layers at als interface and modifying terminal layers
Achieved sensitivity of 397.7 THz/RIU and ultra-high-quality factor of 7.24×10^9
Demonstrated a low detection limit of 7.6×10^-11 RIU and high figure of merit of 1.32×10^9 RIU^-1