High-frequency cutoff periodic dielectric waveguides

We report high-frequency cutoff in periodic dielectric waveguides. The guides consisted of 1-μ photoresist film with a surface corrugation of up to 500 Å overlaid on fused silica substrates. At a wavelength of 1.064 μ we obtained transition between complete cutoff and propagation by variation in the periodicity of the guide of ± 30 Å. For gratings having 500-Å corrugation, unobstructed propagation at 1.32 μ occurred with complete stopping of 1.064-μ light.