Heshmat Barmak, Li Dan, Darcie Thomas E, Gordon Reuven
Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia, Canada.
Opt Express. 2011 Mar 28;19(7):5912-23. doi: 10.1364/OE.19.005912.
We present theory to describe the plasmonic resonances of a subwavelength annular aperture in a real metal plate. The theory provides the reflection, including the amplitude and phase, of radially polarized surface plasmon waves from the end faces of the aperture with a significant departure from the perfect electric conductor case due to plasmonic effects. Oscillations in the reflection amplitude and phase are observed. These oscillations arise from transverse resonances and depend on the geometry of the annulus. The theory is applied to the design of various aperture structures operating at the same resonance wavelength, and it is confirmed by comprehensive electromagnetic simulations. The results are contrasted to the perfect electric conductor case and they will be of significant interest to emerging applications in metamaterials, plasmonic sensors, and near-field optics.
我们提出了一种理论来描述真实金属板中亚波长环形孔径的等离子体共振。该理论给出了径向极化表面等离子体波从孔径端面反射的情况，包括振幅和相位，由于等离子体效应，这种反射与理想导体情况有显著差异。观察到了反射振幅和相位的振荡。这些振荡源于横向共振，并且取决于环形结构的几何形状。该理论被应用于设计在相同共振波长下工作的各种孔径结构，并通过全面的电磁模拟得到了证实。将结果与理想导体情况进行了对比，它们对于超材料、等离子体传感器和近场光学等新兴应用具有重要意义。
