This paper presents an optical sensor based on the surface plasmon resonance (SPR) phenomenon, involved with
liquid crystal (LC) sensitive layer. This sensor has potential applications in chemical and biological systems. We
present a tracking method for the state of alignment and degree of ordering of the partially ordered LC film.
This can be achieved via the SPR propagation constant and the critical angle at the interface between a metal
and an LC film. The proposed idea is also investigated experimentally. For this purpose, we fabricated gold
nano-dots array on an optical fiber tip for localized SPR sensing. The spectral position of the maximum loss in
the transmission spectra depends on the refractive index of the medium surrounding the sensor fiber tips. This
allows for tracking the LC profile parameters.
Flattop liquid crystal tunable optical interleavers have shown a great potential to perform in the DWDM systems. In this
paper, chromatic dispersion analyses are conducted for a flattop liquid crystal tunable optical interleaver based on
Combined Michelson and Gires-Tournois interferometers. In order to try to reduce the dispersion associated with the
interleaver's operation, tuning capability of the liquid crystal is used to tune the chromatic dispersion spectrum.
Simulation results show a 66.5% reduction in the chromatic dispersion for the simulated interleaver configuration when
compared to the air filled cavities in the interleaver. This reduction is achieved without any additional components or
design modifications but only with the tuning capability of the liquid crystal. Moreover, the chromatic dispersion
spectrum can be tuned. This provides more freedom for designers to try to minimize the chromatic dispersion effects on
the system performance.
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