Plasmonic Core/Shell Nanorod Arrays: Subattoliter Controlled Geometry and Tunable Optical Properties

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• 作者：Paul R. Evans ; Gregory A. Wurtz ; Ron Atkinson ; William Hendren ; Daniel O'Connor ; Wayne Dickson ; Robert J. Pollard ; Anatoly V. Zayats
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：August 30, 2007
• 年：2007
• 卷：111
• 期：34
• 页码：12522 - 12527
• 全文大小：299K
• 年卷期：v.111,no.34(August 30, 2007)
• ISSN：1932-7455

文摘

The fabrication and optical properties of a nanostructured system consisting of free-standing metallic nanorodssurrounded by a dielectric nanoshell are reported. The adjustable core-shell geometry allows the resonantoptical properties of the system to be tuned throughout the visible spectrum in the 500-900 nm range. Theshell presents a tubular geometry of uniform thickness that can be varied from a fraction of a nanometer toa few tens of nanometers. This creates a well-defined subattoliter volume for the integration of a substanceto be excited or probed. To exemplify such an application, the sensitivity of the nanostructured system to thevariation of the shell's index of refraction is studied as a function of shell thickness and nanorod aspect ratio.The spectral sensitivity of the longitudinal resonance of the structure was found to be about 100 nm perrefractive index unit with a figure of merit (sensitivity/line-width) of about 1.