Spoof surface plasmon polaritons in terahertz transmission through subwavelength hole arrays analyzed by coupled oscillator model.
Spoof surface plasmon polaritons in terahertz transmission through subwavelength hole arrays analyzed by coupled oscillator model.
复制标题
通过耦合振荡器模型分析太赫兹传输中通过亚波长孔阵列的欺骗表面等离子体激元
DOI：
10.1038/srep16440
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发表时间：
2015-11-09
影响因子：
4.6
通讯作者：
Wang L
中科院分区：
文献类型：
--
作者：
Yin S;Lu X;Xu N;Wang S;E Y;Pan X;Xu X;Liu H;Chen L;Zhang W;Wang L
在周期性亚波长孔阵列的太赫兹传输光谱中观察到欺骗表面等离子体激元的局域共振和激发。通过耦合振荡器模型分析，我们发现太赫兹传输实际上是通过三个连续过程促进的：入射太赫兹场首先引发每个孔周围的局域振荡，然后欺骗表面等离子体激元被局域共振激发，最后两个共振耦合并有助于传输。通过孔尺寸定制局部共振，定量提取欺骗表面等离子体激元和局部共振之间的耦合强度。通过将测量的光谱拟合到修改后的多阶 Fano 模型，进一步证实了孔尺寸依赖的透射率和耦合机制。
Both the localized resonance and excitation of spoof surface plasmon polaritons are observed in the terahertz transmission spectra of periodic subwavelength hole arrays. Analyzing with the coupled oscillator model, we find that the terahertz transmission is actually facilitated by three successive processes: the incident terahertz field first initiates the localized oscillation around each hole, and then the spoof surface plasmon polaritons are excited by the localized resonance, and finally the two resonances couple and contribute to the transmission. Tailoring the localized resonance by hole size, the coupling strength between spoof surface plasmon polaritons and localized resonances is quantitatively extracted. The hole size dependent transmittance and the coupling mechanism are further confirmed by fitting the measured spectra to a modified multi-order Fano model.