Diffraction of monochromatic light on a grating leads to the attenuation of the transmitted beam of diffraction order zero. In the case of a thick grating the diffraction efficiency, and hence the effective attenuation coefficient, is a fast-varying function of the Bragg mismatch angle. According to Kramers–Kronig theory, the transmitted beam encounters a phase shift that also depends on the mismatch angle. This phase shift is measured for holographic gratings in a photoaddressable block copolymer and compared with analytical calculations.
© 2004 Optical Society of America
Michael Häckel, Lothar Kador, Carsten Frenz, and Hans-Werner Schmidt, "Consequences of the Kramers-Kronig relations for light diffraction on thick gratings," Opt. Lett. 29, 1721-1723 (2004)