Terahertz tunable photonic crystal optical filter containing graphene and nonlinear electro-optic polymer

Abstract

In this paper, new photonic crystal optical filters with very unique optical characteristics are presented. The designed structures are composed of stacked SiO 2 isotropic dielectric slabs separated by monolayer graphene sheets. Defect layers of nonlinear electro-optical polymer materials are also inserted to behave as the resonant areas. Results obtained by using the transfer matrix method approach clearly reflect the possibility of the wide photonic band gap generation in the absorption spectra of the proposed crystals in the terahertz frequency range. Furthermore, a very strong relation is seen between the defect layer(s) induced resonant modes and the location/number of the defect(s) inside the crystal. To widen the scope of our findings, in addition to studying the dependencies on the structural characteristics, the tunability of the optical features using the external parameters is investigated systematically. It is shown that the number and central frequencies of the resonant modes are controllable in the far-infrared range by adjusting the temperature and wave incident angle. Thus, the proposed crystals might have remarkable applications in the fabrication of multi-channel tunable filters used in optical integrated circuits.

The impact of magnetized cold plasma and its various properties in sensing applications

“…The foremost beauty of PhC is its ability to control the flow of electromagnetic waves inside it, which leads to the prevention of certain wavelength range passing through the structure. This range of wavelength is known as the photonic bandgap (PBG) 25 , 26 . Introducing a defect layer into the periodic PhC can greatly influence the PBG forming a narrow defect mode 27 .…”

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

“…This tremendous ability of 1D PCs with defects may be exploited for enormous photonic applications, such as biosensors, optical switches, optical splitters, and optical lters. [7][8][9][10] Recently, researchers have shown keen interest in developing PC-based devices composed of gyroidal, metamaterial, superconductor, liquid crystal, metal, nanocomposite materials, etc. for a variety of potential applications, such as omnidirectional mirrors, all-optical switches, high-sensitivity biosensors, PBG waveguides, and tuneable lters.…”

“…This tremendous ability of 1D PCs with defects may be exploited for enormous photonic applications, such as biosensors, optical switches, optical splitters, and optical filters. 7–10…”

Novel Photonic Bio-Chip Sensor Based on Strained Graphene Sheets for Blood Cell Sorting

“…Then, its performance will be far from any challenges that were discussed above. Furthermore, according to the numerous advantages that have been discovered for 2D-materials in last decades [19][20][21][22], walls of the considered bio-cell are covered by single sheets of graphene, to be benefited from the unique features of this amazing material. Details of the considered advantages are discussed in the next section.…”