Unidirectional Ultracompact Optical Nanoantennas
Unidirectional Ultracompact Optical Nanoantennas
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DOI：
10.1021/nl900786u
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发表时间：
2009-06-01
期刊：
影响因子：
10.8
通讯作者：
Kall, Mikael
中科院分区：
文献类型：
--
作者：
Pakizeh, Tavakol;Kall, Mikael
我们报告了由一对相互作用的等离子体纳米粒子组成的简单超紧凑光学纳米天线的显着方向性效应。我们发现，靠近一对粒子中的一个的偶极子源的发射，对于接近反相杂化等离子体的发射波长表现出基本上单向的辐射模式。我们使用电动力学模拟和偶极子分析，从辐射、接收和互易概念方面分析了这种独特的效应。纳米天线由两个 90 nm 宽、20 nm 厚、间隔 10 nm 间隙的金纳米盘组成，在 665 nm 处获得了类似于 18 dB 的前后方向性。
We report on a dramatic directionality effect in a simple and ultracompact optical nanoantenna consisting of a pair of interacting plasmonic nanoparticles. We found that the emission from a dipole source positioned close to one of the particles in the pair exhibits an essentially unidirectional radiation pattern for emission wavelengths close to the antiphase hybridized plasmon. We analyze this unique effect in terms of radiation, reception, and reciprocity concepts using electrodynamics simulations and dipole analysis. A forward-backward directionality of similar to 18 dB at 665 nm is obtained for a nanoantenna that consists of two 90 nm wide and 20 nm thick gold nanodisks separated by a 10 nm gap.