title: Polarizing beam splitter of deep-etched triangular-groove fused-silica gratings.
abstract: We investigated the use of a deep-etched fused-silica grating with triangular-shaped grooves as a highly efficient polarizing beam splitter (PBS). A triangular-groove PBS grating is designed at a wavelength of 1550 nm to be used in optical communication. When it is illuminated in Littrow mounting, the transmitted TE- and TM-polarized waves are mainly diffracted in the minus-first and zeroth orders, respectively. The design condition is based on the average differences of the grating mode indices, which is verified by using rigorous coupled-wave analysis. The designed PBS grating is highly efficient over the C+L band range for both TE and TM polarizations (>97.68%). It is shown that such a triangular-groove PBS grating can exhibit a higher diffraction efficiency, a larger extinction ratio, and less reflection loss than the binary-phase fused-silica PBS grating.
authors.affiliation: Information Optics Laboratory, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China.
authors.forename: Jiangjun
authors.initials: J
authors.lastname: Zheng
authors.forename: Changhe
authors.initials: C
authors.lastname: Zhou
authors.forename: Jijun
authors.initials: J
authors.lastname: Feng
authors.forename: Bo
authors.initials: B
authors.lastname: Wang