Linear and Circular Polarization Filters Using Sculptured Thin Films

Sculptured thin films (STFs) are a new class of nanoengineered materials whose columnar morphology is locally curved to elicit desired optical responses upon excitation. Comprising multimolecular clusters of ~3-5 nm diameter, STFs are essentially unidirectionally nonhomogeneous, locally anisotropic continuums in the visible and the infrared regimes. Periodically nonhomogeneous STFs exhibit the Bragg phenomenon, which makes them very suitable as optical filters.

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