title: Ultracompact high-efficiency polarizing beam splitter with a hybrid photonic crystal and conventional waveguide structure.
abstract: We propose an ultracompact high-efficiency polarizing beam splitter that operates over a wide wavelength range and is based on a hybrid photonic crystal and a conventional waveguide structure. Within a small area (15 microm x 10 microm), this polarizing beam splitter separates TM- and TE-polarized modes into orthogonal output waveguides. Results of simulations with the two-dimensional finite-difference time-domain method show that 99.3% of TM-polarized light is deflected by the photonic crystal structure (with a 28.0-dB extinction ratio), whereas 99.0% of TE-polarized light propagates through the structure (with a 32.2-dB extinction ratio). Wave vector diagrams are employed to explain the operation of a polarizing beam splitter. Tolerance analysis reveals a large tolerance to fabrication errors.
authors.affiliation: Laboratory for Integrated Computing and Optoelectronic Systems, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA.
authors.forename: Seunghyun
authors.initials: S
authors.lastname: Kim
authors.forename: Gregory P
authors.initials: GP
authors.lastname: Nordin
authors.forename: Jingbo
authors.initials: J
authors.lastname: Cai
authors.forename: Jianhua
authors.initials: J
authors.lastname: Jiang