Effect of unmodulated laser light on the nanostructure of a thin solid AD-1 azo dye film

Exposure to light uniform in intensity and polarisation causes marked changes in the surface topography of a thin (320 nm) nanostructured AD-1 low molecular weight azo dye film. Linearly polarised incoherent light with a wavelength of 470 nm and intensity of 1 mW cm^-2 produces numerous teardrop-shaped hillocks of the order of 200 nm in radius over most of the film surface.