Surface phonon resonance enhanced Goos-Hanchen shift and its sensing application in the mid-infrared region

The effect of surface phonon resonance (SPhR) and long range SPhR (LRSPhR) on the Goos-Hiinchen shift (GHS) in the mid-infrared wavelength region are investigated. The GHS is significantly enhanced around the resonant angles of SPhR and LRSPhR with the p-polarized incident light. A highly sensitive refractive index sensor based on the enhanced GHS is proposed. The LRSPhR shows higher GHS and sensitivity than those of SPhR. The GHS and refractive index sensitivity can be further enhanced by engineering the damping rate of the phononic material. These results provide a potential route toward the large GHS and high refractive index sensitivity, thus opening up new opportunities for high sensitivity optical sensors based on GHS at the mid-infrared wavelength range. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The study investigates the impact of surface phonon resonance (SPhR) and long range SPhR (LRSPhR) on the performance of optical sensors, revealing that adjusting the damping rate of the phononic material can enhance the sensitivity of refractive index sensors, with LRSPhR showing superior performance.