Abstract
An optical filter with tunable wavelength and bandwidth has been demonstrated using two cholesteric liquid crystals configured in a reflection mode, in which the incident light is first reflected by one cholesteric liquid crystal and then by the other one. The central wavelength can be tuned from to and the bandwidth can be changed from to . It has potential applications in many fields, especially in optical communications and multispectral and hyperspectral imaging systems.
© 2011 Optical Society of America
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