Junjie Wang , Lingling Yang , Bin Cai , Yongzhi Cheng , Xiangcheng Li
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引用次数: 0
Abstract
In this paper, an ultra-broadband tunable chiral metasurface (CMS) integrated vanadium dioxides (VO2) films is proposed for tri-functional application in terahertz (THz) region. The proposed composite CMS is composed of two twisted sub-wavelength metal gratings adhered on continuous VO2 films in front and back layers, metal deformed-split-ring resonator (DSRR) structure in a middle layer, which are separated by two dielectric layers. When VO2 is in insulating state, the designed composite CMS can achieve an ultra-broadband linear polarization conversion (LPC) and asymmetric transmission (AT) effect, exhibiting that the transmission coefficient of cross-polarization and AT coefficient exceed 90 % from 0.25 THz to 1.30 THz, with a relative bandwidth of 135 %. This ultra-broadband LPC and AT effect is primarily due to interlayer interference and cross-coupling effects of EM fields arising from the anisotropic and chiral characteristics of the CMS structure. However, when VO2 is in metallic state, the composite CMS can significantly reflect the incident THz waves, which promises to be used as a metal mirror reflector for electromagnetic (EM) shielding application. Furthermore, the ultra-broadband LPC efficiency and AT effect of the designed composite CMS can be dynamically modified by altering the conductivity of VO2, which is inherently temperature-dependent and passively modulates with environmental temperature shifts. Leveraging the phase transition property of VO2, the maximum modulation depth can reach an impressive 99.7 %. While the relative bandwidth for a modulation depth of 90 % extends up to 176 %. The proposed VO2 integrated CMS design serves as an important reference for practical applications of THz technology.
期刊介绍:
Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals.
Both theoretical and experimental contributions are invited. Topics suitable for publication in this journal include spin related phenomena, optical and transport properties, many-body effects, integer and fractional quantum Hall effects, quantum spin Hall effect, single electron effects and devices, Majorana fermions, and other novel phenomena.
Keywords:
• topological insulators/superconductors, majorana fermions, Wyel semimetals;
• quantum and neuromorphic computing/quantum information physics and devices based on low dimensional systems;
• layered superconductivity, low dimensional systems with superconducting proximity effect;
• 2D materials such as transition metal dichalcogenides;
• oxide heterostructures including ZnO, SrTiO3 etc;
• carbon nanostructures (graphene, carbon nanotubes, diamond NV center, etc.)
• quantum wells and superlattices;
• quantum Hall effect, quantum spin Hall effect, quantum anomalous Hall effect;
• optical- and phonons-related phenomena;
• magnetic-semiconductor structures;
• charge/spin-, magnon-, skyrmion-, Cooper pair- and majorana fermion- transport and tunneling;
• ultra-fast nonlinear optical phenomena;
• novel devices and applications (such as high performance sensor, solar cell, etc);
• novel growth and fabrication techniques for nanostructures