High Performance Polarizing Beam Splitter with Embedded Metal-wire Nanograting

Based on innovative nano-optical structures and design, an embedded metal-wire nanograting was fabricated for using as a broadband polarizer or polarizing beam splitter to reflect TE-polarized light and transmit TM-polarized light, and AR coating was designed in order to achieve best efficiency for both polarizations. An upper-cladding layer of the same material as the gratings is deposited on the ridge of the gratings, whereas the metal wire is deposited in the grating trenches. This embedded structure makes the grating firmer in its applications. By optimization of the designed structure and AR coating, high polarization efficiency and low insertion loss with a broad wavelength ranges 1000-2000 nm and a wide angular tolerance are obtained