二維奈米電漿光子晶格中粒子的傳輸與捕捉行為

近年來,光學鑷子技術的發展,創建了各種維度的週期性位勢來影響粒子的行為。由於傳統光學鑷子的繞射極限限制,要將實驗尺度縮小到奈米等級極為困難。近年來,電漿子光學捕捉可以克服傳統光學鑷子的繞射極限,其表面電漿可以在遠低於繞射極限下經由共振增強光學強度。本論文研究了直徑 100 nm 與 500 nm 粒子於電漿子加強的二維光晶格中的傳輸以及捕捉行為。本實驗之光晶格位勢是由金結構的二維陣列所組成,且由高斯雷射光束所激發共振,在此光晶格的位勢中,奈米粒子會被引導、捕捉以及排列於此二維陣列當中。我們同樣清楚觀察到粒子排列成六角最密堆積結構於此二維奈米電漿光晶格陣列中。本論文會詳細介紹光學鑷子的架設以及電漿子結構的製程與計算,最後討論粒子於結構中的行為。

關鍵字

光學鑷子；繞射極限；電漿子；表面電漿；傳輸；捕捉；二維陣列；二維光晶格；六角最密堆積

並列摘要

Recently, optical tweezers has been created various dimensions of periodic potential lattice for affecting the behavior of particles. According to the limitation of diffraction limit, it is difficult to shrink the experiment into nanoscale. In recent, plasmanic enhanced optical trapping can overcome the limitation of traditional optical tweezers because the surface plasmon concentrate light far below the diffraction limits and enhance optical intensity by resonance. In this thesis, we research the transport and trapping behavior of nanospheres of diameter 500 nm and 100 nm in two-dimensional nanoscale plasmanic optical lattice. Optical potential of the lattice is created by a two-dimensional of gold nanostructure array, and the plasmon resonance is illuminated by Gaussian beam. We observe the transport and trapping behavior of nanospheres in this optical potential. The stacking of diameter 500 nm spheres into hexagonal closed pack crystalline in this potential is also observed clearly. In this thesis, we introduce the setup of optical system clearly and make an explanation about the calculation and fabrication process of plasmonic structures.

並列關鍵字

optical tweezer ； diffraction limit ； plasmonics ； surface plasmon ； transport ； trapping ； two-dimensional array ； two-dimensional optical lattice ； hexagonal closed pack crystalline

參考文獻

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國際替代計量

二維奈米電漿光子晶格中粒子的傳輸與捕捉行為

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