Wide-angle optical wave Bragg scattering at photonic band-gap structures

Abstract

The general principles of wide-angle optical wave Bragg scattering at photonic band gap structures in form of photorefractive holograms are offered. It was shown that ideal beam steering at the Bragg angle is possible when the condition /spl theta//sub 0/ = /spl theta//sub B/ /spl plusmn/ /spl phi/ = const is met for each grating vector K/sub G/, in which /spl theta//sub 0/ is angle of incidence of the optical wave, /spl phi/ is the inclination of the grating vector, and /spl theta//sub B/ is the Bragg angle. In contrast to acoustical waves photorefractive holograms as fan pattern offers practically unlimited of wide-angle optical-wave scattering and super high efficiency of modulation equal to 1.