Optical properties of planar metallic photonic crystal structures: Experiment and theory
Optical properties of planar metallic photonic crystal structures: Experiment and theory
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DOI：
10.1103/physrevb.70.125113
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发表时间：
2004-09-01
影响因子：
3.7
通讯作者：
Giessen, H
中科院分区：
文献类型：
--
作者：
Christ, A;Zentgraf, T;Giessen, H
我们报告的传输测量结果的金属纳米线阵列沉积在不同的电介质基板上。光栅异常的出现，这严重依赖于基板的厚度，提供了证据表明，这些平面金属光子晶体结构的光学响应可以强烈修改。虽然只有瑞利型异常观察薄介质基板，较厚的波导基板可以诱导强耦合现象。这种强耦合的结果在形成的波导等离子体激元与大拉比分裂高达250毫电子伏。我们发现耦合现象随纳米线光栅周期、入射角以及波导层厚度而变化。采用基于散射矩阵的数值方法计算了这种金属光子晶体结构的透射特性和近场空间分布。所有实验结果都得到了理论计算的证实。
We report on results of transmission measurements of metallic nanowire arrays deposited on top of different dielectric substrates. The appearance of grating anomalies, which critically depend on the substrate thickness, provides evidence that the optical response of these planar metallic photonic crystal structures can be strongly modified. While only Rayleigh-type anomalies are observed for thin dielectric substrates, thicker waveguiding substrates can induce strong coupling phenomena. This strong coupling results in the formation of waveguide-plasmon polaritons with a large Rabi splitting up to 250 meV. We show that the coupling phenomena vary with the nanowire grating period, the angle of incidence, and also the waveguide layer thickness. A scattering-matrix-based numerical method is used to calculate the transmission properties and the near-field spatial distributions of such metallic photonic crystal structures. All experimental results are well confirmed by our theoretical calculations.