非局域双线超材料中的非对称负折射
Asymmetric Negative Refraction in Nonlocal Double-Wire Metamaterials
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中文总结 AI 辅助
本研究展示异质双线超材料通过非局域响应实现损耗非对称双曲色散，产生角度选择性的非对称负折射，为定向能量传输和角度选择性波控提供新途径。
中文摘要 AI 辅助
我们证明了由两个不同且不相连的线阵列组成的异质双线超材料能够实现损耗非对称双曲色散和强非对称负折射。我们揭示，由于其强非局域响应和独特的微观结构，这种几何结构支持两个具有不等损耗的独立双曲传播通道，这些通道可以被以相反角度入射的自由空间传播波选择性激发。这种角度选择性在空气-超材料界面处产生非对称负折射，其特征是透射和吸收中的强角度非对称性，同时保持互易性。这种现象是可扩展的，并且可以在从微波到红外频率的宽频谱范围内用金属线阵列实现，表明非局域性可以模拟剪切类耗散非对称性，而在局域介质中这需要较低的空间对称性。我们的发现为光子平台中的定向能量传输和角度选择性波控开辟了新途径。
英文摘要
We demonstrate that heterogeneous double-wire metamaterials, comprising two dissimilar and nonconnected wire arrays, enable loss-asymmetric hyperbolic dispersion and strongly asymmetric negative refraction. We unveil that, owing to their strongly nonlocal response and distinctive microstructure, such geometry supports two independent hyperbolic propagation channels with unequal losses, which can be selectively excited by free-space propagating waves incident at opposite angles. This angular selectivity gives rise to asymmetric negative refraction at the air-metamaterial interfaces, characterized by strong angular asymmetry in transmission and absorption, while preserving reciprocity. This phenomenon is scalable and can be realized with metallic wire arrays over a broad frequency spectrum extending from microwave to infrared frequencies, showing that nonlocality can emulate shear-like dissipative asymmetry that, in local media, requires lower spatial symmetry. Our findings open new avenues for directional energy transport and angle-selective wave control in photonic platforms.
发表机构
- Instituto de Telecomunicações and Department of Electrical and Computer Engineering, University of Coimbra（科英布拉大学电信研究所与电气与计算机工程系）
- Photonics Initiative, Advanced Science Research Center, City University of New York（纽约市立大学高级科学研究中心光子学倡议项目）
- Physics Program, The Graduate Center, City University of New York（纽约市立大学研究生院物理学项目）
- University of Lisbon–Instituto Superior Técnico and Instituto de Telecomunicações（里斯本大学高等技术学院与电信研究所）
机构由 AI 辅助整理，请以论文原文为准。
