Tuning the scattering response of optical nanoantennas with nanocircuit loads
Tuning the scattering response of optical nanoantennas with nanocircuit loads
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DOI：
10.1038/nphoton.2008.53
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发表时间：
2008-05-01
期刊：
影响因子：
35
通讯作者：
Engheta, Nader
中科院分区：
文献类型：
--
作者：
Alu, Andrea;Engheta, Nader
在最近的研究中，由等离子体细长纳米颗粒制成的光学纳米偶极子已经由各个小组在理论和实验上表征（1-10）。然而，与它们的射频对应物相比，到目前为止，对这些纳米天线的系统设计方法的关注较少，特别是通过使用适当的“加载”技术来优化它们的辐射和散射特性以及调谐它们的频率响应的可能性。通过将纳米颗粒与光的相互作用解释为集总纳米电路元件（11，12），我们展示了如何在等离子体纳米天线设计中完全引入天线负载的概念。特别是，我们展示了如何纳米电路元件，以及一般更复杂的纳米滤波器，在纳米电路理论（11）的框架内设计，并用作纳米负载，可以允许调谐这些纳米天线的散射的频率响应。这些纳米负载的串联和并联组合也被认为是在设计中增加更多的自由度。
Optical nanodipoles made of plasmonic elongated nanoparticles have been theoretically and experimentally characterized by various groups in recent studies(1-10). However, compared with their radiofrequency counterparts, less attention has so far been paid to systematic design methodology for these nanoantennas, and in particular to the possibility of optimizing their radiation and scattering properties and tuning their frequency response by using proper 'loading' techniques. By interpreting nanoparticles' interaction with light as lumped nanocircuit elements(11,12), we show how the concepts of antenna loading may be fully introduced in plasmonic nanoantenna design. In particular, we show how nanocircuit elements, and in general more complex nanofilters, designed within the framework of nanocircuit theory(11) and used as nanoloads, may allow tuning of the frequency response of scattering from these nanoantennas at will. Series and parallel combinations of these nanoloads are also considered to add further degrees of freedom in the design.