Observation of low‐loss optical guidance in thin films of a number of well‐aligned nematic liquid crystals is reported for the first time. Evaluation of waveguiding properties of the oriented films and polarized microscopic techniques indicates a high degree of alignment can be attained and, indeed, is essential for good waveguiding. Propagation losses in the best samples are measured to be less than 1 dB/cm. Amplitude modulation and switching in these waveguides have also been achieved using the unique electro‐optic properties of nematic materials. The response times for these phenomena are on the order of a few milliseconds.

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