表面電漿子因具備「濾波機制創新」、「克服傳統光學繞射極限」、「具高集成密度元件潛力」、「可結合現行光源模組」等項特性，目前已被視為實現奈米等級集成密度元件之全新發展途徑。
本研究藉表面電漿子「克服傳統光學繞射極限」之特性，輔以「共振腔共振」、「穿隧效應」及「破壞性干涉」等物理機制提出穿透式及掃描式等兩型奈米級表面電漿子濾波元件，其中採用「時域有限差分法」為數值模擬主體，並搭配快速傅利葉轉換分析元件穿透頻譜，應用邊界條件包含Perfectly matched layer（PML）、Impedance-matching layer（IML）及連續邊界等，電漿材料則以Drude模型予以描述。
穿透式元件基本設計構想係藉平面波源激發輸入端矩形半開放式共振腔與金屬銀介面處之表面電漿子（單一模態），考量共振腔長度決定其共振頻段，故僅特定頻段之表面電漿子模態可於共振腔內產生駐波共振現象，同時前揭模態亦將藉體電漿共振穿隧機制將能量傳遞至輸出端矩形半開放式共振腔，並於共振腔中產生表面電漿子駐波共振現象，進而於輸出端共振腔輸出特定頻段之表面電漿子模態，俾達濾波之目的。
反觀掃描式元件則以MIM波導結構兩側金屬（銀）內縱置橫向平行排列矩形封閉式共振腔對為佈局，藉穿隧效應引入並儲存MIM波導內具共振頻率之表面電漿子傳輸能量，其中頻率為共振頻段之表面電漿子將於共振腔產生駐波共振現象，基於共振腔內共振模態於返回MIM波導後衍生之破壞性干涉致使表面電漿子無法賡續沿波導傳輸，而頻率非屬共振頻段之表面電漿子，封閉式共振腔僅被視為近場障礙，無法有效引入並儲存表面電漿子能量，故於表面電漿子之輸出頻譜顯現特定頻段具極低之透射比，發揮截止頻段濾波器之功能。

Since surface plasmons are equipped with various features as “innovative mechanism of filter,” “prevailing over limit of traditional optics diffraction,” “potentiality for high-density and integrated component” and “feasibility integrating current light-source mould,” it has already been considered as the entirely novel approach of development for the realization towards nano-scalar integrated components.

This research make use of the feature in surface plasmons as “prevailing over limit of traditional optics diffraction” and complement it with physical mechanism of “cavity resonance,” “tunneling effect,” and “destructive interference” as to put forth two types of transmission and scanning surface plasmons filter. Among which, finite-difference time domain method (FDTD) is employed as the algorithm for numerical simulation, and collocated with Fast Fourier Transform (FFT), making use of boundary conditions as which perfectly matched layer (PML), impedance-matching layer (IML), and continuous boundary, while plasmons material is described in Drude model.

The concept of basic design for transmission component basic design is to exploit exciting surface plasmons (single mode) between the interface of rectangle half-open resonance cavities and metal silver at the input end of plane wave source. Since the length of resonance cavity is considered to determine its resonance frequency band, it is only surface plasmons from specific frequency band can have produced resonance phenomenon of standing wave within resonance cavities. Meanwhile, resonance mode will also transmit energy from tunneling effect mechanism of body plasmons resonance to rectangle half-open resonance cavities at output end. In such a way, resonance phenomenon of standing wave from surface plasmons will be generated at resonance cavities so that surface plasmons with specific frequency band with resonance cavities at output end is found, achieving the purpose of wave filtering.

As we probe into scanning component, horizontal and parallel arrangement of rectangle closed resonance cavities are deployed with MIM waveguide structure on two metal sides (silver) inside vertically. With such design, it is hoped to resort to tunneling effect, and store transmission energy from surface plasmons within resonance frequency of MIM waveguide structure. For surface plasmons with frequency band of resonance, it will produce resonance phenomenon of standing wave from resonance cavities as destructive interference derived from resonance surface plasmons mode in resonance cavities after returning MIM waveguide is incapacitated to continue waveguide for transmission. However, frequency of surface plasmons classified as not the resonance, closed resonance cavities would be merely reckoned as near field obstacles for it is unable to effectively introduce or store surface plasmons energy. As a result, output spectrum of surface plasmons will demonstrate extremely lower transmittance of specific frequency band, helping to function interrupting and stopping as band wave filter.

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