Terahertz nonreciprocal and functionality-switchable devices based on dielectric multilayers integrated with graphene and VO<sub>2</sub>
Shengnan Yin, Zebin Zhu, Xiangfei Gao, Qing Wang, Jing Yuan, Ying Liu, Liyong Jiang
Abstract
Recently, terahertz (THz) nonreciprocal and functionality-switchable devices have drawn much attention. Here we report a magnetic-free THz unidirectional perfect absorber as well as a functionality-switchable device between the band-pass filter and perfect absorber based on dielectric-graphene multilayers containing a VO 2 defect layer. We provide a theoretical explanation for the nonreciprocal transmission properties. The working frequencies of these devices can be tailored by using graphene layers of different chemical potentials.
Topics & Concepts
Terahertz radiationMaterials scienceGrapheneOptoelectronicsDielectricOpticsTransmission (telecommunications)Filter (signal processing)Terahertz spectroscopy and technologyRefractive indexTransmission coefficientOptical filterElectromagnetic radiationTerahertz gapAttenuation coefficientElectric fieldAbsorption (acoustics)Optical rectificationBand-pass filterChemical vapor depositionThin filmMetamaterials and Metasurfaces ApplicationsPlasmonic and Surface Plasmon ResearchTerahertz technology and applications