Liquid-Crystal Blazed-Grating Beam Deflector
A transmission-type nonmechanical multiple-angle beam-steering device that uses liquid-crystal blazed grating has been developed. Sixteen steering angles with a contrast ratio of 18 has been demonstrated. A detailed analysis of the liquid-crystal and poly(methyl methacrylate) blazed-grating deflector was carried out to provide guidance during the deflector's development. A manufacturing offset compensation technique is proposed to improve the device's performance greatly. A hybrid approach utilizing electrically generated blazed grating combined with the cascading approach described here yields in excess of 500 deflecting angles.
Additional Information© 2000 Optical Society of America. Received 5 January 2000; revised manuscript received 25 August 2000. This research was supported by the U.S. Air Force Rome Laboratory and the National Science Foundation Engineering Research Center for Neuromorphic Systems Engineering at the California Institute of Technology. X. Wang and D. Psaltis thank Jean- Jacques Drolet for his valuable contribution at the early stage of this research.
Published - WANao00.pdf