High-performance D-shaped optical fiber refractive index sensor based on coupling between a silicon subwavelength grating and surface plasmons
To simultaneously achieve high spectral resolution and efficient fixed-wavelength intensity interrogation in D-shaped fiber refractive-index sensing, a waveguide-coupled D-shaped optical fiber sensor integrating an indium tin oxide (ITO) film, a Cytop coupling layer, and a silicon subwavelength grating (Si-SWG) is pr...