Holographic gratings are recorded in azo-dye nitrobenzoxazole-labeled phospholipid thin films by use of 244-nm UV light. The gratings continue to grow for more than 1 h, even after the recording light is removed. The diffraction efficiency of these gratings shows extreme sensitivity to humidity and can increase reversibly by 2 orders of magnitude in air that is saturated with water vapor. This effect is related to the unique characteristics of phospholipid molecules that undergo hydration-dependent structural reorganization and self-assembly.
© 2005 Optical Society of America
A. Sharma, M. Dokhanian, A. Kassu, and Atul N. Parekh, "Photoinduced grating formation in azo-dye-labeled phospholipid thin films by 244-nm light," Opt. Lett. 30, 501-503 (2005)