Design of Tunable Devices at Terahertz Frequencies Based on Quasi-Photonic Crystals Incorporated with Graphene

Abstract

In this study, we present a new theoretical model including Thue-Morse and double-period sequences as quasi-photonic crystals are incorporation with graphene and investigate the transmission properties of the THz waves in both structures using a straightforward computational method. We also consider properties of nonlinear conductivity in addition to surface linear conductivity for graphene. We observe the sharp peaks and proper forbidden bands are created in the range of 0.3 THz to 30 THz. In addition, we find that by considering the nonlinear term of graphene and engineering the structural parameters such as the chemical potential of graphene, number of layers and the incidence wave angle, transmission levels of peaks enhance scientifically and quality factor improve considerably. These results show that it would be possible to design of high-Q tunable filters with multi-stop bands in the THz regime which can reduce the noise associated with THz frequency peaks and increase the number of sharp frequency peaks.

Tunable dual-band absorber based on graphene structures with a chipped wheel in the terahertz range

“…The term terahertz (THz) band primarily refers to the frequency of 0.1ThZ-10Thz, which is located in the electromagnetic radiation band between the microwave and infrared [1]. Due to the special frequency band of the terahertz wave, it has many special properties such as transient, broadband, penetration, and the like [2,3]. Therefore, terahertz technology is widely used in such as perfect absorber [4], polarization conversion [5], terahertz high data rate communication [6].Once a structure is fabricated, however, the absorber optical properties cannot be altered, leading to an extremely challenging tunability, and even raising some issues of polarization dependence, which largely limit their development in optoelectronic devices.…”

Design of High-Sensitivity Surface Plasmon Resonance Sensor Based on Nanostructured Thin Films for Effective Detection of DNA Hybridization

“…Graphene is one of the 2D materials that can greatly enhance localized surface plasmons due to its adjustable electrical properties [11]. Furthermore, quasi-photonic crystals as a new kind of photonic crystal have emerged [12] that are used for a variety of applications, such as waveguides [13], filters [14][15][16], and optical sensors [17]. Quasi-photonic crystals as the new class of stack layers give an extra degree of freedom for tailoring photonics and photonic bandgaps based on their spectral gaps in the frequency domain.…”

Design of High-Sensitivity Surface Plasmon Resonance Sensor Based on Nanostructured Thin Films for Effective Detection of DNA Hybridization

“…Furthermore, quasi-photonic crystals as a new kind of photonic crystal have emerged [17] that are used for a variety of applications, such as waveguides [18], filters [19][20][21], and optical sensors [22]. Quasi-photonic crystals as the new class of stack layers give an extra degree of freedom for tailoring photonics and photonic bandgaps based on their spectral gaps in the frequency domain.…”