Abstract
A simple ultraviolet filter utilizing the absorption mechanism of a liquid crystal compound at its isotropic state is demonstrated. Such liquid crystal filter absorbs ultraviolet radiation below the cutoff wavelength and transmits visible and near infrared light with high efficiency. The cutoff wavelength is mainly determined by the liquid crystal material employed, but can be fine-tuned by varying the absorbing layer thickness. These devices are very simple to fabricate and can be scaled up to large sizes. Practical application for large screen projection display is emphasized.
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