DIFFRACTIVE SELECTIVELY POLARIZING BEAM SPLITTER AND BEAM ROUTING PRISMS PRODUCED THEREBY

摘要

A diffraction grating with a lattice period exhibiting significant polarization selectivity is used as a polarization beam splitter for obliquely incident polarization. The diffraction grating is preferably a subwavelength of the illumination beam and is designed to substantially transmit the TM polarization and substantially reflect the TE polarization at any wavelength or angle of incidence. The polarizing beam splitter is integrated with other optical elements such as a sub-wavelength retarder to form a polarizing beam router, a dichroic combiner, a curved beam splitter, or an optical pickup device using the optical beam splitter and the luter for easy manufacturing. Can be.