Atomically Thin Nanomaterials-Enhanced Plasmonic Sensors Operating in Near-Infrared

In this paper, we investigated the sensing performance of a Goos-Hänchen shift-based surface plasmon resonance sensor enhanced by atomically thin phase change nanomaterials. The sensitivity enhancement based on this novel material has been demonstrated theoretically and experimentally in the visible and near-infrared regions (633 nm and 785 nm). With the phase change materials, the resonance dip was closer to zero and led to a higher optical phase related SPR sensitivity. Moreover, the excitation wavelength in the near-infrared region can significantly improve the Q factor of the SPR curves, which results in a higher sensing resolution. With the optimization of the excitation wavelength and the thickness of sensing substrate, approximately 100 times higher sensitivity has been obtained.