Department of Electrical and Computer Engineering, Rice University, MS-366, 6100 Main Street, Houston, Texas 77005, USA.
ACS Nano. 2010 Dec 28;4(12):7566-72. doi: 10.1021/nn102003c. Epub 2010 Nov 19.
Au nanoparticles deposited on a metallic film act as nanoantenna receivers and transmitters for the coupling of free-space radiation into, and out of, 2D surface plasmons. Nanosteps, sub-10-nm gaps between metallic films of differing thickness, can also launch and detect surface plasmons. Here we use both types of structures to locally launch propagating surface plasmon waves and probe their properties. Nanoparticle-launched surface plasmons emerge as two lobes of nominally 90 degree angular width, propagating along the direction of incident polarization. Alternatively, plasmons can be launched unidirectionally, by asymmetric illumination of a nanoparticle receiver.
在金属膜上沉积的金纳米粒子充当纳米天线接收器和发射器，用于将自由空间辐射耦合进和出二维表面等离激元。纳米台阶，即不同厚度的金属膜之间的亚 10nm 间隙，也可以激发和探测表面等离激元。在这里，我们使用这两种结构来局部激发传播的表面等离激元波，并探测它们的性质。纳米粒子激发的表面等离激元表现为两个名义上 90 度角宽度的瓣，沿入射偏振方向传播。或者，可以通过非对称地照射纳米粒子接收器来单向激发等离子体。
