Abstract
Optical notch and band pass filter systems with continuous fine tuning resolution are realized by combining left- and right-handed cholesteric liquid crystal wedge cells. Notch filter system is polarization-independent in whole spectral range, from ~460 nm to ~1,000 nm. In the band pass filter system, depending on the arrangement of the cells, it could be either polarization-independent or polarization-dependent. Furthermore, the photonic band gap width of the band pass filter could be changed reversibly from 36 nm to 16 nm.
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