Anisotropic gratings are recorded on bacteriorhodopsin films by two parallelly polarized beams, and the effect of the polarization orientation of the reconstructing beam on the diffraction efficiency kinetics is studied. A theoretical model for the diffraction efficiency kinetics of the anisotropic grating is developed by combining Jones-matrix and photochromic two-state theory. It is found that the polarization azimuth of the reconstructing beam produces a cosine modulation on the kinetics of the diffraction efficiency, being positive at the peak efficiency and negative for steady state. By adding auxiliary violet light during grating formation, the saturation of the grating can be restrained. As a result, the negative cosine modulation for the steady-state diffraction efficiency changes to a positive one. In addition, the steady-state diffraction efficiency is increased appreciably for all reconstructing polarization orientations.
© 2008 Optical Society of America
Diffraction and Gratings
Original Manuscript: November 30, 2007
Manuscript Accepted: December 22, 2007
Published: February 14, 2008
Peng Gao, Baoli Yao, Junhe Han, Liju Chen, Yingli Wang, Ming Lei, and Romano A. Rupp, "Effect of reconstruction beam polarization on the kinetics of anisotropic gratings in bacteriorhodopsin," J. Opt. Soc. Am. A 25, 685-691 (2008)