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 $527\mathrm{nm}$ to $574\mathrm{nm}$ and the bandwidth can be changed from $10\mathrm{nm}$ to $80\mathrm{nm}$. 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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