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Spectral singularities and asymmetric light scattering in PT-symmetric 2D nanoantenna arrays

机译:PT对称2D纳米纳米阵列中的光谱奇异性和不对称光散射

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摘要

The intriguing physics of non-Hermitian systems satisfying parity-time (PT) symmetry has spurred a surge of both theoretical and experimental research in interleaved gain-loss systems for novel photonic devices. In this work, we investigate vertically stacked GaInP PT-sym metric nanodisk resonators arranged in two-dimensional periodic lattice using full-wave numerical simulations and scattering matrix theory. The proposed dielectric metasurface supports lasing spectral singularities with asymmetric reflection and highly anisotropic far-field scattering patterns. It offers a much broader design parameter space to control wavelength, scattering direction, and efficiency of optical emission when compared to the predominantly one-dimentional (1D) or quasi-1D structures studied so far. The proposed. system with Q-factor >10(5) serves as a powerful platform for enhanced light-matter interaction by enabling extensive control of asymmetric light scattering, amplification, and unprecedented localization of electromagnetic fields. (C) 2020 Optical Society of America
机译:满足奇偶校正时间(PT)对称性的非封闭系统的有趣物理促使了用于新颖的光子器件的交错增益系统的理论和实验研究飙升。在这项工作中,我们研究了使用全波数值模拟和散射矩阵理论布置在二维周期晶格中的垂直堆叠的GAINP PT-SYM公制纳米磁盘谐振器。所提出的电介质元表面支持具有不对称反射的光谱奇异性和高度各向异性的远场散射图案。与到目前为止研究的主要一致(1D)或准1D结构相比,它提供了更广泛的设计参数空间以控制波长,散射方向和光发射效率。提议。具有Q系子> 10(5)的系统用作增强光质交互的强大平台,通过实现电磁场的不对称光散射,放大和前所未有的定位来增强光质交互。 (c)2020美国光学学会

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