We present new approaches for realizing enhanced tunable filters based on filling special fibers with nematic or cholesteric liquid crystal. One of the suggested approaches is to realize high-resolution longitudinal structure of electrodes using printed circuit board technology and then fill tapered capillaries with the liquid crystal, thus obtaining the desired spectral response at low voltage and with low insertion loss. Another approach is to fill special photonic crystal fibers with liquid crystal and obtain spectral tunability by generating phase differences between light paths.
Bibliographical noteFunding Information:
The authors would like to acknowledge the contribution of Profs. Jonathan C. Knight and Philip St. J. Russell to this research, which was carried out in Bath University, in the Photonics and Photonic Materials Group. Zeev Zalevsky would like to thank the UK Engineering and Physical Science Research Council for funding his visits to Bath.
- In-fiber devices
- Liquid crystals