Negative refraction at visible frequencies
Negative refraction at visible frequencies
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DOI：
10.1126/science.1139266
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发表时间：
2007-04-20
期刊：
影响因子：
56.9
通讯作者：
Atwater, Harry A.
中科院分区：
文献类型：
--
作者：
Lezec, Henri J.;Dionne, Jennifer A.;Atwater, Harry A.
纳米块状光子材料为制造光在物质中的传播和色散提供了机会。我们演示了在可见光光谱的蓝绿色区域实现二维负折射率材料的实验实现，并通过负折射的直接几何可视化得到证实。利用超薄的Au-Si3N4-Ag波导支持具有反平行群和相速度的表面等离子激元模式，获得了负折射率。在这种双金属波导与传统的Ag-Si3N4-Ag缝隙波导的界面上观察到了全角度负折射。这一结果可能为在可见光范围内开发实用的负折射率光学设计提供依据。
Nanofabricated photonic materials offer opportunities for crafting the propagation and dispersion of light in matter. We demonstrate an experimental realization of a two-dimensional negative-index material in the blue-green region of the visible spectrum, substantiated by direct geometric visualization of negative refraction. Negative indices were achieved with the use of an ultrathin Au-Si3N4-Ag waveguide sustaining a surface plasmon polariton mode with antiparallel group and phase velocities. All-angle negative refraction was observed at the interface between this bimetal waveguide and a conventional Ag-Si3N4-Ag slot waveguide. The results may enable the development of practical negative-index optical designs in the visible regime.