高階模態異常穿透特性於週期性非對稱型結構及類蝴蝶結型結構於金屬/矽及金屬/介電質/金屬結構之孔洞陣列

Abstract

本文在實驗及模擬上透過不同型態的孔洞，研究高階模態的異常穿透及相關特性。透過週期性非對稱型結構以及類蝴蝶結型結構兩種不同方式，量測位於週期排列的金屬孔洞上之表面電漿子的異常穿透圖，且經由模擬數據分析來驗證實驗結果。於非對稱型結構中，週期性孔洞穿透與喇叭型孔洞共振腔長度有關，透過週期改變，共震波峰將會與Wood’s anomaly互相影響。若將此結構坐在反射結構上，雙波侷域性孔洞型震盪模態會於短波長及長波長位置產生。於類蝴蝶型孔洞結構中，實驗透過改變雙孔洞結構、改變單一孔洞結構，增加垂直方向蝴蝶型來產生高階模態的增益。藉由改變孔洞形狀，在中紅外線穿透上量測到更高階模態的穿透增益不侷限在二階模態，於更高階模態上，仍然有相對較強的穿透增益。

The thesis discussed the higher order modes enhancement on non-centrosymmetric, double apertures and bowtie-like hole array by experimental and simulation results. Considering the extraordinary transmission on these two types hole array, higher order modes were measured and calculated directly. In non-centrosymmetric hole array, trumpet shape hole array was investigated in the relation between main peaks and length of X. By varying the periodic parameter Px, the interaction between Wood’s anomaly and LSRs were shown clearly. Also, double LSRs are shown in MIM structure in shorter and longer wavelength. Double apertures sample perforated with Ag film were investigated. Besides the strong enhancement in bowtie structure [86], the experiment provide a novel way to stimulate higher order modes enhancement in different geometric figures such as double circles and double pentagons. Within double apertures structure such as circles and square, experiment results show the strong enhancement on (3,0) and (4,0) Ag/Si mode. Bowtie-like samples also provide higher order mode transmission. By replacing one of the bowtie triangles with circle, square, and rotation triangle, experiments show that the second order mode still being stimulated highly than fundamental mode. Also, double bowtie samples in orthogonal direction were investigated. Experiment results show that (2,2) Ag/Si mode stimulated more than fundamental mode and the (2,0) Ag/Si mode.