Figure 4. Demonstration of humidity response of NW structures.

Change in the 1^st order diffraction efficiency with humidity cycling, measured on a film with NW structure. The 1^st order diffraction efficiency (η_1st) = (intensity of the first order diffraction ring)/(intensity of the incident laser light). The measurement was performed on a film coated at a spinning rate of 1000 rpm (t ~ 12.4 µm) onto a glass substrate.