Tunable multiband band-stop filter based on graphene metamaterial in THz frequency

ABSTRACT

In this paper, a tunable multiband band-stop filter based on single-layer and few-layer doped periodically graphene rings is designed at THz wavelength. The performance of the proposed structure is calculated by using the finite-difference time-domain method. The metamaterial structure is comprised of the concentric graphene ring resonators printed on substrate layer of silica medium. The multiband band-stop filter can be achieved by adjusting the numbers of graphene ring resonator. More importantly, a dynamically tunable filter can be designed by adjusting the applied voltage or chemical potential doping to manipulate graphene’s Fermi energy. The z-component electric field is investigated to explain the physical mechanism of the transmission. In addition, the proposed filter has the advantage of independence to polarization and insensitivity to the angles of the incident wave. Our design can have potential applications in various fields of tunable photonic devices, sensors and multi-band communication.

KEYWORDS:

• Metamaterial filter
• tunable multiband filter
• polarization insensitive
• incident angle

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [grant number 61275070]; Shanghai Natural Science Foundation: [grant number 15ZR1415900].

Notes on contributors

Chuan Li

Chuan Li is the student from School of Communication and Information Engineering, Shanghai University. His research interests include design and fabrication of filter based on metamaterial.

Zhongyin Xiao

Zhongyin Xiao received the PhD degree from School of Communication and Information Engineering, Shanghai University in 2005. He is currently a Professor in the Shanghai Institute for Advanced Communication and Date Science. His research interests include microwave millimeter wave circuit; electromagnetic wave propagation in complex medium; metamaterial technique; optical waveguide theory and technology.

Wei Li

Wei Li is the student from School of Communication and Information Engineering, Shanghai University. His research interests include design and fabrication of wave-absorbing materials.

Huanling Zou

Huanling Zou is the student from School of Communication and Information Engineering, Shanghai University. Her research interests include design and fabrication of chiral material.