Magnetic field induced multichannel tunable filter properties of photonic band gap materials

Abstract

we have explored the tunable multichannel characteristics of one-dimensional (1D) plasma photonic structure in presence of static magnetic field applied externally parallel and anti-parallel to the direction of propagation under normal incidence. We have theoretically examined the transmission characteristics of the binary photonic design consisting of alternate layers of CaF2 and magnetic cold plasma layers by means of transfer matrix method (TMM) which is amongst the one of the popular techniques for simulating 1D multilayer periodic structures based on MATLAB. The proposed structure possess N-1 number of distinct transmission peaks, each of unit transmission called as transmission channels in transmission spectra for given the number of periods N > 1. In this study N varies from 2 to 6 in steps of 1 to get 1 to 5 transmission channels respectively. Further we have also investigated how these transmission channels can be repositioned inside PBG by applying the static magnetic field (B) externally under right hand polarization (RHP) and lift hand polarization (LHP) configurations for given N at B = 0T, 0.02T, 0.04T and 0.06T. The reason behind the existence of these transmission channels is due to the superposition of evanescent and propagating waves inside plasma and dielectric layers respectively. The existence of these transmission channels inside PBG is different from the transmission bands which are formed due to the interference of forward and backward propagating waves. Besides this the tuning sense of the transmission channels at fixed B applied parallel or anti parallel to direction of periodicity, by changing the angle of incidence corresponding to TE and TM polarization case has also been examined to get some more useful and interesting tunable multichannel characteristics of the current design which cannot be obtained in conventional PPCs.

Externally tunable multichannel filtering applications of organic material based 1D magnetic cold-plasma photonic crystals

“…This idea may further be used for the development of organic-material-detection technology based on PCs due to the excellent sensing capabilities of photonic structures. [20][21][22][23] In this study, we examined the tuneable multichannel properties of four 1D PCs composed of four different organic materials, namely pentane, hexane, heptane, and octane, along with MCP material separately in the presence of B polarized in RH and LH congurations. The effect of the period number N on the multichannel ltering property in the presence B polarized in RH and LH congurations was also examined to increase the number of resonant peaks inside the PBG of all four 1D PCs containing different organic materials.…”

“…This idea may further be used for the development of organic-material-detection technology based on PCs due to the excellent sensing capabilities of photonic structures. 20–23…”

Design and analysis of 1D photonic crystal doped with magnetized cold plasma defect for application of single/multi-channel tunable narrowband filter

“…L Qi et al explained the effect of external magnetic field on the bandgap characteristics under oblique incidence angle [27]. A H Aly et al reported a 1D binary PhC designed with CaF2 and MCP and studied its tunable channel properties in case of RHP and LHP for TE and TM modes [34]. A Kumar and co-workers designed tunable broadband reflector and the narrowband filter by employing MCP/dielectric material based 1D PhC [35], and assayed the transmittance spectra for both RHP and LHP conditions.…”

Study on a one-dimensional defective photonic crystal suitable for organic compound sensing applications

“…Photonic crystals (PCs) are multilayer smart composite structures with unusual and intriguing optical properties, in which the refractive index modulates periodically in one, two and three orthogonal directions. [1][2][3][4][5][6][7] They have tremendous ability to control the propagation of incident electromagnetic waves of different frequencies. PCs are characterized by their photonic band gaps (PBGs), which effectively attenuate the incident light of certain frequencies inside the PBG and allow others to pass through the photonic structure.…”