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標題: | 一維金屬薄膜週期性孔洞之異常穿透現象與紅外線熱發射器之特性研究 The Extraordinary Transmission through a Metal Film Perforated with Periodic Hole Arrays and the Characteristics of Infrared Thermal Emitter |
作者: | Yi-Han Ye 葉宜函 |
指導教授: | 李嗣涔(Si-Chen Lee) |
關鍵字: | 表面電漿子,熱發射器,耦合效應, surface plasmon,thermal emitter,coupling effect, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 本文在理論及實驗上計算並量測出在週期排列的金屬孔洞上之表面電漿子的能帶圖,且經由量測在銀薄膜上以正方形陣列排列之不同縱橫比的長方形孔洞的異常穿透現象,觀察在孔洞周圍的局部電荷振盪所造成的影響。另外,在量測上層金屬具有一維格柵之表面電漿紅外線熱發射器的能階圖時,發現了侷域性表面電漿子模態。不同於一般表面電漿子模態,此侷域性表面電漿子模態並不受週期的影響,反而是取決於上層格柵的金屬寬度。藉由改變中間層二氧化矽的厚度可觀察在上、下銀/二氧化矽介面的表面電漿子之間耦合的現象。此耦合效應造成熱發射器的頻譜產生紅位移的現象。隨著二氧化矽厚度的增加,發現了侷域性表面電漿子以及表面電漿子兩個模態之間的轉換現象。 The band diagram of surface plasmons (SPs) on a periodic array of metal holes is investigated in theory and experiment. The extraordinary transmission through a silver film perforated with rectangular hole arrays in a square lattice with different aspect ratios is measured in order to investigate the influence of localized charge oscillations around the hole. Besides, the localized surface plasmon polariton (LSPP) modes were observed by measuring the dispersion relation in infrared plasmonic thermal emitters with top Ag grating. Different from the behavior of SP modes, the LSPP modes are determined by the top Ag line width and are independent of the period of the grating. By varying the thickness of the intermediate SiO2, the coupling of SPs between the top and bottom Ag/SiO2 interface was investigated. This coupling effect results in the red shift of emission peak of thermal emitter. Furthermore, the transition from LSPP modes to SP modes was observed as the thickness of SiO2 layer increased. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/26581 |
全文授權: | 未授權 |
顯示於系所單位: | 電子工程學研究所 |
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ntu-97-1.pdf 目前未授權公開取用 | 3.01 MB | Adobe PDF |
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