Fabrication of Plasmonic Metamaterials and Study on Its Optical Properties

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Project title

Code/計畫編號

MOST103-2112-M019-003-MY3

Translated Name/計畫中文名

電漿子超穎材料的製作與其光學性質之研究-電漿子超穎材料的製作與其光學性質之研究

Project Coordinator/計畫主持人

Hai-Pang Chiang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

劉威志
張瑞麟

Department/Unit

Department of Optoelectronics and Materials Technology

Website

https://www.grb.gov.tw/search/planDetail?id=11280293

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Bugetid/研究經費

2455千元

ResearchField/研究領域

物理
光電工程
材料科技

最近有一種人工介質引起廣大的注意 ,那就是雙曲型超穎材料 (hyperbolic metamaterials, HMM)。這是透過其等頻曲線的獨特型式來獲得其命名,就是其等頻曲線是雙曲型的而不是在一般介電質普遍的圓形。此種超穎材料會引起廣泛的研究,最主要的原因是因為相對容易的奈米加工、寬帶的非共振響應、波長的可調性、塊狀 3 維響應等因素。雙曲型超穎材料可以被用來作為許多應用,從負折射率波導、次繞射光子通道、到奈米等級的共振腔等。在可見光和近紅外的波長範圍中,雙曲型超穎材料是對於實際應用中最有前景的一個人造材料。最近在有著特定雙曲發散的不定型超穎材料 (indefinite metamaterials),已經發現了一些有趣的應用。更有研究報告利用此不定型超穎材料製作出三維不定型共振腔，製作出高達 17.4的折射率。基於過去幾年在表面電漿共振及表面增強拉曼散射的理論與實驗上的研究經驗與成果，我們計畫利用濺鍍或電子束蒸鍍的方法來製作不定型超穎材料 (indefinite metamaterials)，並結合奈米球微影術以製作出三維不定型共振腔(3D indefinite cavities)。藉由濺鍍的方法準確的控制金屬及介電質的厚度以及選擇不同金屬及介電質的組合，以製作出金屬－介電質多層不定型超穎材料，並研究其光學性質，再結合奈米球微影術製作出三維不定型共振腔，以進行侷域表面電漿共振、表面增強拉曼散射光譜以及金屬增強螢光的實驗研究，在研究的過程中並需要海大光電所張瑞麟教授進行現象學的理論模型建立，以及師大物理系劉威志教授協助進行有限元素及有限差分的數值模擬。本計畫的第一年將著重於不定型超穎材料(indefinite metamaterials)的製作，因濺鍍的設備較為昂貴，將尋求中研院、台大及國研院儀科中心等合作夥伴，期能在有限的研究經費下，仍能製作出此超穎材料，再結合本實驗室已經相當純熟、所需經費不高的奈米球微影術以製作出三維不定型共振腔(3D indefinite cavities)。計畫的第二年將利用第一年計畫中所製作出的三維不定型共振腔，做為表面增強拉曼散射的基板，用於表面增強拉曼散射光譜的研究，因為，此三維不定型共振腔的共振模態可以隨著不同金屬及介電質的組合而改變，我們也將進行不同雷射波長激發的表面增強拉曼散射的研究。計畫的第三年則將結合三維不定型共振腔與以及螢光時間解析系統，研究如何利用不定型超穎材料以增進金屬增強螢光的增益以及對螢光材料生命週期的影響。相信此計畫三年後的研究成果，將可以對於這些不定型超穎材料與三維不定型共振腔相關光學特性有通盤的了解，並對於三維不定型共振腔的製作、表面增強拉曼光譜、金屬增強螢光、化學或生物感測器等領域帶來新的契機。Recently, an artificial media called hyperbolic metamaterials have attracted more and more attentions. These materials have unique properties that their iso-frequency contour is hyperbolic instead of sphere as ordinary dielectrics are. The reasons that these metamaterials arouse great attentions are mainly due to easy nano-fabrication, broadband non-resonance response, wavelength tenability, and bulk 3D response. Hyperbolic metamaterials could be applied to many research fields, such as negative refractive waveguide, sub-diffraction photon tunnel and nano-cavity. In the visible and IR region, hyperbolic metamaterials are the most promising artificial media for practical applications. Recently, there are some interesting applications of indefinite metamaterials with specific hyperbolic dispersion. One reported that refractive index as high as 17.4 was achieved based on 3D indefinite cavity fabricated from indefinite metamaterials. Based on our experimental and theoretical accomplishments at the research topic of surface plasmon resonance and surface enhanced Raman scattering (SERS) in the past few years, we propose to fabricate indefinite metamaterials by using sputtering or E-gun evaporation and 3D indefinite cavities with nanosphere lithography. These 3D indefinite cavities can be employed in the experimental research of localized surface plasmon resonance, SERS and metal-enhanced fluorescence with the help of Prof. Railing Chang in the theoretical modeling and Prof. Wei-Chih Liu in the computer simulation. In the first year of this project, we will focus on the fabrication of indefinite metamaterials with the help of collaborating partners in NTU, Academia Sinica, and RCAS. We will then fabricate 3D indefinite cavities with the low-cost techniques of nanosphere lithography. In the second year of this project, we will perform experimental research of SERS with 3D indefinite cavities employed as SERS substrates. Since the modes of 3D indefinite cavities can be tuned by changing the combination of metals and dielectrics, we will also perform the experiment of SERS with multi-wavelength excitation. In the third year of this project, metal-enhanced fluorescence and life-time shortening of fluorescent materials combined with 3D indefinite cavities will be studied by using PL and time-resolved PL systems. We believe the research results of this three-year project will bring a whole-through understanding of indefinite metamaterials and 3D indefinite cavities.

Keyword(s)

電漿子
表面增強拉曼散射
不定型超穎材料
金屬增強螢光
plasmons
surface-enhanced Raman scattering
indefinite metamaterials
metal-enhanced fluorescence

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Fabrication of Plasmonic Metamaterials and Study on Its Optical Properties

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