Abstract: An embedded wire-grid nanograting was designed and fabricated for using as a broadband polarizing beam splitter to reflect s-polarized light and transmit p-polarized light. A protected cladding layer of the same material as the grating’s was deposited on the ridge, whereas the wire-grid is deposited in the grating trenches, which makes it more firm during application. High polarization extinction ratios of above 40 and 20 dB for transmission and reflection, respectively, with a broad wavelength range for the whole optical communication bandwidth (850-1700 nm) and a wide angular tolerance (>±20°) are obtained by optimization of the designed structures, and the grating period is 200 nm.

Key words: polarizing beam splitter,  wire-grid nanograting,  extinction ratio