Nano- and Micro-Corrugations in Photo-Aligned Polymer Thin-Films; Correlations Between Topologies and Directional Light Scattering

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Isotropic and anisotropic nano- and micro-corrugations in polymer thin-films are shown to be independently tunable via photo-controlled diffusion of liquid crystalline pre-polymer molecules on substrate surfaces. Amplitude and shape of MC-topologies are quantitatively correlated with light scattering. Scattering from monomer corrugated (MC)-topologies is correlated with the averaged power spectral density (PSD) function of MC-height fluctuations and shown to be proportional to PSD. Paper-white MC-diffusers with optimal field of view, minimal glare and brightness enhancement exceeding 25 are demonstrated. Photo-patterning of MC-topologies is shown to render multidirectional diffusers and diffuse reflectors feasible. Generation of ultra thin MC-reflectors does not require micro tools and renders integration into flat panel displays feasible.
2003-11-15