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

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 θ₀ = θ_B ± φ = const is met for each grating vector K_G, in which θ₀ is angle of incidence of the optical wave, φ is the inclination of the grating vector, and θ_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.