金屬奈米線陣列於電漿子超穎材料之製備與應用

Fabrication and Applications of Plasmonic Metamaterials Based on Arrays of Metal Nanowires

蔡焜棟(Kun-Tong Tsai)

《光學工程》 129期 (2015/04) Pp. 11-16

摘要

新型電漿子超穎材料可經由電化學沉積金屬奈米線或奈米粒子陣列到陽極氧化鋁基板之自我對準的奈米通道中而建立，結合聚焦離子束微影技術，此一前所未有、可用於發展並加工相關奈米材料的奈米技術平台，已開發用於定制超穎材料並表現出異乎尋常的光學性質如雙曲色散、介電常數接近零的行為，以及表面增強拉曼散射等。利用此一垂直排列之銀奈米線陣列中所存在的雙曲色散，我們首先實現了第一個藉由超穎材料平板透鏡之成像動作，並使在超穎材料表面上的狹縫可藉由負折射現象在平板透鏡後方成像。

關鍵字

超穎材料 ； 電漿子學 ； 陽極氧化鋁 ； 聚焦離子束 ； 奈米線

並列摘要

Novel plasmonic metamaterials have been created by electrochemically depositing arrays of metal nanowires or nanoparticles into anodic aluminum oxide (AAO) substrates with self-aligned nanochannels. In conjunction with focused ion beam (FIB) lithography, this unprecedented nanotechnology platform for the growth and processing of nanomaterials have been exploited for the fabrication of custom-made metamaterials exhibiting exotic optical properties such as hyperbolic dispersion, epsilon-near-zero behavior, and surface-enhanced Raman scattering. Taking advantage of hyperbolic dispersion in arrays of vertically-aligned silver nanowires, the first lensing action of such a flat slab of metamaterials was demonstrated. A slit object on the surface of the metamaterial slab lens was shown to form an image behind the lens due to the negative refraction.

並列關鍵字

Metamaterial ； plasmonics ； AAO ； focused-ion-beam ； nanowire