Dynamically-Tunable Terahertz Band-Stop Filter Based on Multilayer Graphene Metamaterial

Abstract

In this paper, a dynamically-tunable band-stop filter based on periodically patterned graphene nanostrip and nanodisk in THz wavelength is proposed and numerically investigated at room temperature. The properties of proposed structure are calculated by using the finite-difference time-domain method. The patterned graphenes are excited by the incident light which leads to absorb two different ranges of spectral wavelength. The simulated results show that a wide free spectral range can be achieved by using multilayer graphene. More importantly, it is found that the transmission dips can be dynamically controlled by adjusting the gate voltage. Moreover, the transmission dips change with graphene mobility which corresponds to graphene intrinsic loss. Finally, the proposed metamaterial structure may be used for many applications such as tunable sensors, active plasmonic switches, and slow light devices.

Theoretical Study of Plasmonically Induced Transparency Effect in Arrays of Graphene-Based Double Disk Resonators

“…3 and 4 it is possible to verify that the dielectric substrate cause a significant redshift of the resonant frequency for both disks. Such as in [14], [15], the increase in the average refractive index of the whole structure caused by the substrate is related to the lower resonant frequencies observed in Fig. 4.…”

Design a Photonic Crystal Narrowband Band Pass Filter at a Wavelength of 1570 nm for Fiber Optic Communication Applications

“…The process of selecting wavelengths in optical lters occurs through the resonator ring. In general, in the resonators, the coe cient of refraction and the dimensions of the resonator ring have a direct effect on the resonance wavelength [22,23]. This structure has two input and output ports, depending on the wavelength of the light, the light wave can be directed to the output port through the resonator ring, or it may not be able to coupler to the resonator ring and to re ect the input port.…”