雙層-金屬/介電質微米穹形珠體的光子奈米噴流

Photonic nanojet of a bilayer metal/dielectric micro-dome

林宇祥(Yu-Siang Lin)

指導教授 ： 林清彬

淡江大學/工學院/機械與機電工程學系碩士班/碩士(2019年)

https://doi.org/10.6846/TKU.2019.00055

摘要

光子奈米噴流有著光點遠小於入射光波長且能量集中的特性，因此可以提供檢測和成像尺寸遠低於繞射極限物質的方法。本研究提出一種具有金屬薄殼之穹型珠體的新穎製造技術，將感光性UV膠潤濕於家幽靈蛛（Pholcus phalangioides）的曳絲(dragline silk)上藉由蜘蛛絲的集水特性，蜘蛛絲表面自然會形成紡錘珠體(spindle-knots)，再將未固化的紡錘珠體與低表面能的白蠟平板接觸後，藉由白蠟的斥水效應將紡錘珠體變為微米穹型珠體(micro-dome)，接著使用真空濺鍍和濺鍍技術在穹體表面分別鍍上金、銀、銅及金銀薄殼，最後經由三種雷射光波長(405nm、532nm、671nm)照射下，產生光子奈米噴流。本研究使用時域有限差分法(Finite Difference Time Domain method，FDTD)模擬不同金屬薄殼之核殼穹體在不同入射光照射下，產生的光場分布及能量強度的變化。使用共軛焦顯微鏡系統觀察核殼穹體的光子奈米噴流現象，並撰寫Matlab程式分析光子奈米噴流現象的各種參數，如噴流焦距、衰減長度、半高全寬及能量強度等，並與數值模擬的參數做交互比較。本研究發現不同的金屬薄殼材料能夠改變金屬核殼穹體產生的光子奈米噴流特性，例如使聚焦效果變好、增加焦距、或增加聚焦強度，此研究未來可應用於高解析度光學顯微鏡中以觀察各種奈米級的目標物。

關鍵字

光子奈米噴流 ； 蜘蛛絲 ； 紡錘體 ； 核殼穹體 ； 繞射極限 ； 超解析度

並列摘要

Photonic nanojets have two characteristics which are spot is much smaller than the wavelength of incident and the energy is concentrated , thus photonic nanojets can provide for detecting and imaging substance well below the size of diffraction limit size. This study proposes a novel method for manufacturing micro-domes with a thin metal shell. First, the photosensitive UV resin is wetted on the surface of the Pholcus phalangioides silk, owing to the water collecting characteristics of the spider silk, the surface of the spider silk naturally forms some spindle beads. After the uncured spindle beads touched with a white wax plate with low surface energy, the spindle beads are changed into micro-domes by the water-repellent effect of the white wax, and then the surface of the micro-dome is respectively plated with metal shell by vacuum sputtering and sputtering techniques. Finally, photonic nanojets are generated by irradiation of three kinds of laser light wavelengths (405 nm, 532 nm, 671 nm). In this study, the finite difference time domain (FDTD) method is used to simulate the variation of the light field distribution and energy intensity of different metal shells irradiated by different laser incident light and the phenomenon of photonic nanojets in the core-shell by conjugated microscope system. The Matlab program is used to analyze various parameters of the photonic nanojets phenomenon, such as the focal length, decay length, the full width at half maximum and the energy intensity. Numerical simulations are compared with experimental results. This study found that different metal shell materials could change the photonic nanojets characteristics, such as increasing the focus effect, increasing the focal length and increasing the focus intensity. The results of this study will help to solve the problems of nano-scale image measurement in high-tech industry.

並列關鍵字

Photonic nanojets ； Spider silk ； Spindle-knots ； Core-shell micro-dome ； Diffraction limit ； Super resolution

參考文獻

參考文獻

[1] Ruska, Ernst. "The early development of electron lenses and electron microscopy." Microscopica acta. Supplement Suppl 5 (1980): 1-140.

[2] Oatley, C. W., W. C. Nixon, and R. F. W. Pease. "Advances in Electronics and Electron Physics, vol. 21." (1965): 181.

[3] 林宮玄, “顯微鏡變顯「奈」鏡了！”, 科學月刊社 ,2014.

[4] Binnig, C. F. "Quate, and Ch. Gerber. "Atomic force microscope. Phys Rev Lett 56.9" (1986): 930-933.