We achieve interface states with a high reflectance in photonic heterostructures composed of two kinds of all-dielectric one-dimensional photonic crystals (1DPCs) with symmetric unit cells. The reflectance of interface states can be controlled flexibly by tuning the mismatch degree between the imaginary phases of the two kinds of 1DPCs. Assisted by the interface state with a high reflectance as well as a high-$Q$ factor, the Goos-Hänchen (GH) shift can be greatly enhanced to larger than three orders of wavelengths. Our work provides a route, completely under the current experimental conditions, to design high-performance sensitive sensors, wavelength division demultiplexers, and polarization beam splitters based on this giant GH shift together with a high reflectance.

• Received 12 January 2020
• Accepted 27 April 2020

DOI:https://doi.org/10.1103/PhysRevA.101.053838