Quantum-classical Analogies Based On Artificial Metamaterial Structures And Devices

In recent years,with the continuous progress of science and technology,new materials and devices with special properties are urgently needed in the fields of mechanics,acoustics and electromagnetism,while the artificial metamaterials emerging,in this background.The electromagnetic metamaterials,also known as super medium,it has the advantage of the natural materials that the electromagnetic characteristics.By designing the periodic unit or combination rule of metamaterials,metamaterials can control the propagation direction,polarization mode and propagation mode of electromagnetic waves.At present,artificial metamaterials have a far-reaching influence and a broad prospect in many fields such as microwave devices,antenna systems,sensors and so on.The application frequency covers a wide spectrum from low-frequency,microwave,terahertz to optical band.Simultaneously,the research on metamaterial theory also shows that metamaterials can be used as a new platform to explore the quantum-classical analogies of microstructure,and research on such quantum-classical analogies phenomena as Fano resonance and electromagnetically induced transparency(EIT)of metamaterials will be beneficial to the development of slow light devices,sensing chip and efficient laser.At present,metamaterials in microwave frequency band are mostly realized by the metal structure printed on the PCB board,and the performance of the device is limited by the loss caused by the metal impedance.All-dielectric metasurface has ability to overcome material losses and compatibility with 3D printing and semiconductor fabrication processes,so that gained wide attention.Due to the unique optical and electrical properties of graphene,graphene-based optical devices and tunable metasurfaces have become an important research field.Quantum-classical analogies in metamaterials and devices,such as Fano and EIT,are provide an important way for using metamaterials as a special platform to study quantum phenomena.In this paper,class Fano resonance in dielectric metasurface with high dielectric constant and EIT-like effect in graphene waveguide devices are studied and analyzed in detail.(1)In this paper,an all-dielectric metasurface with Fano resonance is designed by the electromagnetic coupling between dielectric block resonators.A three-level atomic system is constructed by embedding a dielectric block with high dielectric constant into a substrate with low dielectric constant.The resonance in the metasurface transmission spectrum depends on the coupling state between the resonators of each dielectric block,and the resonance can be adjusted by adjusting the structural parameters.When the resonance frequencies of the electro-magnetic coupling mode are almost the same,the special case of Fano asymmetric resonance occurs,that is,EIT effect.The metasurface designed is sensitive to the changes of refractive index of the surrounding environment,and has potential application value in environmental sensing.Its Q value can be up to 1310 and the sensitivity can reach 6.15GHz/RIU.Its resonance characteristics are also discussed by time-coupled mode theory and energy level theory.(2)In this paper,a novel graphene waveguide device is proposed to realize the tunable EIT effect.The electromagnetic induced transparent spectral response is due to the interference of quasi-dark mode and quasi-bright film in the graphene resonator loaded by the device.The EIT transparent window can be electrically adjusted by changing the Fermi level of graphene.The amplitude of the transparent window can be adjusted according to different geometric parameters of the graphene plasma waveguide.The EIT-like transmission spectrum can be customized by changing the geometric parameters of the structure.The relationship between the transparent window frequency and the chemical potential of the graphene material reveals the two-dimensional properties of the graphene plasma.This structure provides a new solution for the design of tunable graphene sensors and slow light plasma devices in the terahertz band.