We demonstrate a polarization-sensitive diffractive optical element by femtosecond laser direct writing of light-induced self-assembled nano-gratings in bulk silica glass. Manipulation of the induced form bire fringence is achieved by controlling the writing parameters, in particular, the polarization azimuth of the writing beam. The performance of the diffraction-based circular-polarization beam splitter agrees with the theoretical prediction. The method allows extending the operation of space-variant subwavelength gratings of beam polarization converters to the visible range.
© 2010 Optical Society of America
Original Manuscript: December 23, 2009
Revised Manuscript: March 31, 2010
Manuscript Accepted: April 7, 2010
Published: May 7, 2010
Martynas Beresna and Peter G. Kazansky, "Polarization diffraction grating produced by femtosecond laser nanostructuring in glass," Opt. Lett. 35, 1662-1664 (2010)