Resonant Excitation of Volume and Surface Fields on Complex Electrodynamic Surfaces
Resonant Excitation of Volume and Surface Fields on Complex Electrodynamic Surfaces
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DOI：
10.1103/physrevapplied.11.034034
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发表时间：
2019-03-14
影响因子：
4.6
通讯作者：
Ronald, K.
中科院分区：
文献类型：
--
作者：
MacLachlan, A. J.;Robertson, C. W.;Ronald, K.
分析，数值和实验研究的体积和表面场耦合的平面金属周期性表面晶格（PSL）结构叠加在介质基板与金属背衬（PSLDM）。我们展示了锁频PSLDM耦合本征模和解锁表面场共振（无衬底PSL）的形成。这些实验观察结果与理论和数值预测非常吻合。第一次证明了场耦合系数α的推导。通过比较理论和数值色散，我们得到α。可能的散射机制和色散行为的亚波长“有效介电”的PSLs的详细分析。本文提出的理论和测量方法适用于从光频到太赫兹的宽频率范围，是高功率短波长光源、太阳能电池和替代亚波长吸收器创新的基础。
Analytical, numerical, and experimental studies of volume and surface-field coupling in planar metal periodic surface lattice (PSL) structures superimposed on dielectric substrates with a metallic backing (PSLDM) are presented. We show the formation of frequency-locked PSLDM-coupled eigenmodes and unlocked surface-field resonances (PSL without substrate). These experimental observations are in excellent agreement with theoretical and numerical predictions. For the first time, the derivation of a field coupling coefficient alpha is demonstrated. By comparing theoretical and numerical dispersions, we obtain alpha. Detailed analysis of possible scattering mechanisms and dispersive behavior in subwavelength "effective metadielectric" PSLs is shown. The theory and measurements presented in this paper are applicable over a broad frequency range from optical frequencies to THz and are fundamental to the innovation of high-power short-wavelength sources, solar cells, and alternative subwavelength absorbers.