A Continuously Tunable Optical Filter System in Broad Spectral Range

摘要

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.