Tunable 1D nano-photonic filter using Nematic liquid crystal and high-Tc superconductors

In this paper, the properties of hybrid photonic band gaps (PBGs) has been theoretically investigated using the transfer matrix method (TMM) and Gorter Casimir two-fluid model. These 1D photonic quasicrystals are built using the hybrid materials (Bi,Pb)2Sr2Ca2Cu3Ox/anisotropic Nematic liquid crystal layers. Based on the simulation results, a tunable PBG can be achieved within the transmission spectrum with sub comb-like resonant peaks at regular temperature of high Tc superconductor. The PBG properties and the number of resonant peaks are directly modulated by the superconductor temperature, the thickness of the dielectric layers and the lattice parameters of the quasi-periodic structure. In addition, the dependence of the PBGs on the temperature of the Nematic liquid crystal is discussed. The behavior of PBGs undergoing mechanical deformation for both polarization modes and in the presence of an external applied voltage is discussed. These structures can serve as tunable optical stop-band-gap-filters in photonic integrated circuits.