Analysis of magnetically biased graphene absorber using anisotropic HIE-FDTD method

ABSTRACT

An anisotropic hybrid implicit-explicit finite-difference time-domain scheme is developed to investigate the magnetically biased graphene absorber. The anisotropic conductivity of the graphene is incorporated into the scheme by using the auxiliary difference equations. Numerical examples show that the presented scheme has much higher simulation velocity than the conventional finite-difference time-domain scheme, because the time increment in proposed method is not confined by the fine meshes in graphene sheet. Besides, the results validate that, by controlling the biased magnetic field, the graphene exhibits tunable polarization rotation property at Terahertz spectra and can be used to design magnetically tunable Terahertz absorber effectively.

KEYWORDS:

• Absorber
• finite-difference time-domain
• graphene
• magnetically biased
• terahertz

Additional information

Funding

This work was supported by Technology Program of Shenzhen [grant number JCYJ20170816100722642], and also supported by the Natural Science Foundation of Guangdong Province, China [grant number 2018A030313429].

Notes on contributors

Chunming Tian

Chunming Tian was born in Jilin, China, in 1974. He received the PhD degree in radio physics from Xidian University, Xi'an, China, in 2003. He now serves as a lecturer at Xi'an Jiaotong University. His research interests are the numerical electromagnetic methods, antenna and microwave device design, and HPM.

Juan Chen

Juan Chen was born in Chongqing, China, in 1981. She received the PhD degree in electromagnetic field and microwave techniques at Xi'an Jiaotong University, Xi'an, China, in 2008. She now serves as a professor at Xi'an Jiaotong University. Her research interests are the numerical electromagnetic methods, antenna designs, and electromagnetic compatibility analysis.