The propagation characters of selective-filled photonic crystal fibres

The spectral characteristics and the number of bandgap of photonic liquid crystal fibre are analysed. By changing the filling ratio of air holes, the number of photonic bandgap increases and the output spectra also move to shorter wavelength more significantly, nearly 20 nm with increasing temperature. The light power in the central core disappears and reappears at high temperature when all or half of air holes are filled with liquid crystal. Such structures are quite useful for optical fibre sensor, filter and optical switch.