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標題: | 金屬表面波紋結構增強光學天線之研究 Study on Surface-Corrugation Enhanced Optical Antenna |
作者: | Yi-Han Huang 黃意翰 |
指導教授: | 李佳翰(Jia-Han Li) |
關鍵字: | 有限時域差分,表面電漿,光學天線,表面增強拉曼散射,顯微技術,光譜技術,生物感測, FDTD,surface plasmon,optical antenna,SERS,microscopy,spectroscopy,sensor, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 近幾年來,將天線縮小至奈米尺度已成為熱門的議題,而這些奈米尺度的天線被稱為奈米天線或是光學天線。光學天線可以用來提升顯微技術的效率,將光學訊號輻射至局部區域,也能將局部區域的光學訊號輻射傳播出去。藉由光學天線的設計,可取代傳統的聚焦透鏡,來增加訊號接收效率。光學天線的尺寸大小、光學天線之間的距離以及光學天線的放置平台,都已有了系統性的研究及討論。由於光學天線的尺度相當小,而激發光學天線的光源聚焦範圍相對較大,我們希望將更多能量導入奈米尺度的光學天線中,使光學天線的局部表面電漿增強,進而增強該區域電場能量而增強拉曼散射訊號。我們提出利用週期性同心圓結構的概念,使光線照射同心圓結構後產生表面電漿波,並將外圍的光源能量導入中心,並在中心放置光學偶極天線,達到增強光學偶極天線的效應。我們利用時域有限差分法模擬我們提出的概念,藉此探討週期性同心圓結構對光學偶極天線的增強效果,並探討增強的原因及其物理機制。其後,對於此結構進行最佳化,探討各項參數對此結構的影響。並嘗試利用電子束蝕刻技術進行製作。我們在此建立週期性同心圓結構增強光學偶極天線的物理機制及有效設計此結構的方法。 These years, antenna in nano scale were attracted more attentions. We called such structures as optical antenna or nanoantenna. The development of optical antenna could promote the efficiency of microscopy. It can be used for converting propagating radiation into localized area and vice versa. In other words, it can be used to replace the focal lens to collect light energy into area smaller than diffraction limit. In order to improve the performance of optical antenna, studies about the dimensions, gap distance and platform of optical antenna were studied systematically. We provide a concept to promote the localized electric filed intensity |E|2 of optical dipole antenna which is used for redirecting the emission of Raman signal. This can be accomplished by combining the bull’s eye structure and optical antenna. By finite difference time domain (FDTD) simulation, it can be proved that the electric filed intensity |E|2 in the gap of the optical antenna can be enhanced dramatically. We analyzed the physical mechanism and different geometrical features to construct a way to optimize the structure integrating bull’s eye and optical antenna. The results show the way to design a structure with stronger localized electric intensity for applications of surface enhanced Raman scattering (SERS) and microscope applications. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60973 |
全文授權: | 有償授權 |
顯示於系所單位: | 工程科學及海洋工程學系 |
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