週期性網狀薄膜金屬線與螺旋形金屬薄膜孔洞之異常穿透特性

本文在實驗上觀察二維金屬網狀結構的異常穿透特性，並用一維金屬線的實驗結果來解釋。在波長遠大於周期時，傳統的金屬柵偏振特性可以藉由一些特殊二維金屬網狀結構來改變。這類型結構是在金屬光柵中加入周期性互相聯繫的金屬線，會產生額外的共振膜態，並造成強烈的反射，可以使用在特殊的濾波器應用。另外，在量測光穿透螺旋型孔洞時同時可以觀察到表面電漿效應以及螺旋共振的效應。而螺旋自體共振會有強烈的極化選擇性，而同時還會產生巨大的旋光效果，使單一金屬薄膜就達到調整光極化的目的。

關鍵字

異常穿透；表面電漿；光柵；網狀光柵；平面金屬結構；極化光；旋光

並列摘要

The extraordinary light transmission of two-dimensional rectangular metallic meshes is experimentally demonstrated. The results are explained by orthogonally superimposed one-dimensional gratings. For wavelengths that are much larger than the metal strip period, the transmission spectrum of the traditional wire-grid polarizer could be modified by interconnecting wires between the strips. It performs a special filter with a stop band from excited surface current along the additional wires that causes extra resonating modes of the individual structures. The extraordinary transmission of spiral resonators is also experimentally and numerically demonstrated. It is observed that both suface plasmon modes and shape resonance modes will contribute to the enhanced transmission. The shape resonance mode is polarization dependent and will induce giant specific rotatory power. This structure gives rise to a full modulation of polarization states by a single structured metal thin film.

並列關鍵字

extraordinary transmission ； surface plasmon ； grating ； mesh grating ； planar ； metallic ； structrue ； chiral ； polarization ； polarization azimuth rotation

參考文獻

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週期性網狀薄膜金屬線與螺旋形金屬薄膜孔洞之異常穿透特性

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