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Opt Lett. 2005 Mar 1;30(5):501-3.

Photoinduced grating formation in azo-dye-labeled phospholipid thin films by 244-nm light.

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  • 1Department of Physics, Alabama A&M University, Normal, Alabama 35762, USA.


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.

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