标题： 鱼网状负折射率光学超材料理论 显示英文标题

标题： Theory of fishnet negative-index optical metamaterials

摘要： 我们理论研究光学频率下的鱼网超材料。 与早期的工作不同，我们通过跟踪由相互交叉的亚波长等离子体波导组成的鱼网网格中能量的横向和纵向流动，提供了微观描述。 该分析得到了基于表面等离子体耦合模方程的半解析模型的支持，该模型提供了鱼网折射率的准确公式，包括实部和虚部。 该模型简单地解释了表面等离子体如何在波导交叉处耦合，并为光学频率下的鱼网负折射率范式提供了新的见解。 还提出了适用于具有增益介质的损耗补偿超材料的理论扩展。 显示英文摘要

摘要： We theoretically study fishnet metamaterials at optical frequencies. In contrast to earlier works, we provide a microscopic description by tracking the transversal and longitudinal flows of energy through the fishnet mesh composed of intersecting subwavelength plasmonic waveguides. The analysis is supported by a semi-analytical model based on surface-plasmon coupled-mode equations, which provides accurate formulas for the fishnet refractive index, including the real-negative and imaginary parts. The model simply explains how the surface plasmons couple at the waveguide intersections and it shines new light on the fishnet negative-index paradigm at optical frequencies. Extension of the theory for loss-compensated metamaterials with gain media is also presented.