Polarization Conversion and Absorption of Multifunctional All-dielectric Metamaterial Based on Vanadium Dioxide
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Polarization Conversion and Absorption of Multifunctional All‑dielectric Metamaterial Based on Vanadium Dioxide Fei Lv1,2 · Zhongyin Xiao1,2 · Xiaojie Lu1,2 · Mingming Chen1,2 · Yongjin Zhou1,2 Received: 8 May 2020 / Accepted: 3 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, we propose a kind of multi-functional all-dielectric metamaterial (ADMM), which is composed of vanadium dioxide (VO2), silicon, and silicon dioxide. Two functions of polarization conversion and wave absorption are realized by using the phase change characteristics of VO2. When the VO2 is in the insulating state, the structure has the function of transmission polarization conversion and realizes the conversion from line-polarized wave to cross-polarized wave. The polarization conversion rate (PCR) is more than 95% in 250-nm bandwidth. The reason of the high PCR is analyzed from the perspective of the amplitude and phase of the field component. The first-order Mie resonance is found by looking at the distribution of electric field. When the VO2 is in the metallic state, the structure has the absorption function. Within the bandwidth of 482 nm, the absorption efficiency is more than 80%. By looking at the distribution of electric field and magnetic field, the main reason for the strong absorption effect is explained. Finally, the effect of V O2 conductivity on performance was studied. Keywords All-dielectric · Polarization conversion · Absorber · Phase change · Vanadium dioxide
Introduction Electromagnetic metamaterials (MMs) are composed of periodic or aperiodic structures whose size is much smaller than a wavelength. Different from natural materials, the MMs can obtain some abnormal electromagnetic properties by adjusting the unit structure, such as negative permittivity, negative permeability, and negative refractive index. In the past few decades, different types of MMs have been reported [1–4]. In these reports, most MMs contain metals. However, metallic materials with weak oxidation resistance, large ohmic loss, and high thermal conductivity will consume a lot of energy, which will reduce the stability and efficiency of the device [5]. In addition, metallic structures in MMs usually have complex geometry, which leads to * Fei Lv [email protected] * Zhongyin Xiao [email protected] 1
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai, China
Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China
2
manufacturing difficulties and high costs. Recently, researchers have been interested in finding alternatives to metallic MMs. The Mie resonance of the all-dielectric metamaterials (ADMMs) provides a wider space for people to design new materials with controllable permittivity and permeability [6–10]. In addition, because ADMMs usually have simple geometry, such as a cube and cylinder, so the cost is low and the manufacturing is simple. The abundant resonant modes make it have g
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