Effective wavelength scaling for optical antennas
Effective wavelength scaling for optical antennas
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DOI：
10.1103/physrevlett.98.266802
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发表时间：
2007-06-29
影响因子：
8.6
通讯作者：
Novotny, Lukas
中科院分区：
文献类型：
--
作者：
Novotny, Lukas
在天线理论中，天线参数与入射辐射的波长λ直接相关，但这种缩放在金属表现为强耦合等离子体的光学频率处失败。在这封信中，我们表明，天线设计可以转移到光学频率制度，通过替代λ线性缩放的有效波长λ（eff）= n（1）+ n（2）λ/λ（p），λ（p）是等离子体波长和n（1），n（2）是系数，取决于几何形状和材料属性。假设天线由半径为R的线性段制成
In antenna theory, antenna parameters are directly related to the wavelength lambda of incident radiation, but this scaling fails at optical frequencies where metals behave as strongly coupled plasmas. In this Letter we show that antenna designs can be transferred to the optical frequency regime by replacing lambda by a linearly scaled effective wavelength lambda(eff) = n(1) + n(2)lambda/lambda(p), with lambda(p) being the plasma wavelength and n(1), n(2) being coefficients that depend on geometry and material properties. It is assumed that the antenna is made of linear segments with radii R