Diffraction limited focusing and routing of gap plasmons by a metal-dielectric-metal lens
Diffraction limited focusing and routing of gap plasmons by a metal-dielectric-metal lens
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DOI：
10.1364/oe.23.021899
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发表时间：
2015-08-24
期刊：
影响因子：
3.8
通讯作者：
Aksyuk, Vladimir
中科院分区：
文献类型：
--
作者：
Dennis, Brian S.;Czaplewski, David A.;Aksyuk, Vladimir
无源光学元件可以在诸如等离子体激元集成电路的光子应用中发挥关键作用。在这里，我们实验证明被动间隙等离子体聚焦和路由在二维。这是使用并入到平面波导装置中的高数值孔径金属-电介质-金属透镜来实现的。通过金属溅射，氧化物沉积，电子和聚焦离子束光刻，和氩离子铣削制造的详细报告。衍射限制聚焦的光学特征在于用显微镜对耦合输出的光进行采样。测量的焦距和半高宽光斑尺寸与计算的透镜性能吻合得很好。表面等离子体激元的传播长度是通过从多个耦合器输出的狭缝中取样来测量的。(C)2015美国光学学会
Passive optical elements can play key roles in photonic applications such as plasmonic integrated circuits. Here we experimentally demonstrate passive gap-plasmon focusing and routing in two-dimensions. This is accomplished using a high numerical-aperture metal-dielectric-metal lens incorporated into a planar-waveguide device. Fabrication via metal sputtering, oxide deposition, electron-and focused-ion-beam lithography, and argon ion-milling is reported on in detail. Diffraction-limited focusing is optically characterized by sampling out-coupled light with a microscope. The measured focal distance and full-width-half-maximum spot size agree well with the calculated lens performance. The surface plasmon polariton propagation length is measured by sampling light from multiple out-coupler slits. (C) 2015 Optical Society of America