Synthesis and Simulation of Nano-Composite Metamaterial for Broadband Negative Refractive Index in Visible Spectral Regime

Mosadegh Keshavarz, A. Rostamia, M. Dolatyari, R. gh, S. Khosravi
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Abstract

In this paper, a nano-metamaterial with the structure of Ag-SiO2-PbTe is proposed that has a random arrangement in the host medium of expanded polystyrene (foam) for the realization of a broadband negative refractive index at the visible spectrum. The negative refractive index for the purposed meta-material was obtained from the plasmonic resonance in the core and outer layer for both electric and magnetic components of light. Here, we use different radii for the outer layer of nanoparticles to create the broadband negative permeability. In this way, the doped semiconductor nanoparticles are included in the host medium to create the broadband negative permittivity. The overlap between the spectrum of the negative permittivity and permeability introduces the broadband negative refractive index at the visible band. The novel introduced structure creates the broadband negative refractive index and it is simple and practical for fabrication. For the realization of the proposed material, synthesis and characterization of the designed nanocomposite structure are investigated. To this end, the absorption and the transmission coefficients of the synthesized material are measured and compared with theoretical results. The obtained results indicate that the numerical simulations using Mie theory have good agreement with the experimental results.
可见光波段宽带负折射率纳米复合超材料的合成与模拟
本文提出了一种具有Ag-SiO2-PbTe结构的纳米超材料,该材料在膨胀聚苯乙烯(泡沫)介质中具有随机排列,可在可见光谱上实现宽带负折射率。该超材料的负折射率是通过光的电、磁分量在核心层和外层的等离子体共振得到的。在这里,我们使用不同半径的外层纳米颗粒来创建宽带负磁导率。通过这种方式,掺杂的半导体纳米颗粒被包含在宿主介质中以产生宽带负介电常数。负介电常数和磁导率谱之间的重叠在可见光波段引入了宽带负折射率。该结构可产生宽带负折射率,制作简单实用。为了实现所提出的材料,研究了所设计的纳米复合材料结构的合成和表征。为此,测量了合成材料的吸收系数和透射系数,并与理论结果进行了比较。结果表明,用Mie理论进行的数值模拟与实验结果吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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