Submicron guided-mode-resonance filter for wide bandwidth near-infrared polarizer

We aim to present a design for a submicron polarizer in the near-infrared (IR) wavelength range with a wide bandwidth that can be fabricated using conventional thin-film microfabrication technology to reduce costs. A near-IR transverse magnetic polarizer with 95% transmittance at 2400 nm, more than 1000-nm resonance peak bandwidth, and an extinction ratio (ER) of 300 was designed using a gold wire grid-based guided-mode-resonance filter with a 700-nm grating width and 1200-nm grating period. The ER can be increased by increasing the wire grid thickness, but in this case, its resonance peak moves to longer wavelengths. A cavity resonance was found to exist between two adjacent wire grids when the grid thickness is >800  nm.