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Keywords = Fano linewidth spectral contrast ratio

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12 pages, 567 KiB  
Article
Narrow and Deep Fano Resonances in a Rod and Concentric Square Ring-Disk Nanostructures
by Yanyan Huo, Tianqing Jia, Yi Zhang, Hua Zhao, Shian Zhang, Donghai Feng and Zhenrong Sun
Sensors 2013, 13(9), 11350-11361; https://doi.org/10.3390/s130911350 - 26 Aug 2013
Cited by 25 | Viewed by 7500
Abstract
Localized surface plasmon resonances (LSPRs) in metallic nanostructures have been studied intensely in the last decade. Fano interference is an important way to decrease the resonance linewidth and enhance the spectral detection resolution, but realizing a Fano lineshape with both a narrow linewidth [...] Read more.
Localized surface plasmon resonances (LSPRs) in metallic nanostructures have been studied intensely in the last decade. Fano interference is an important way to decrease the resonance linewidth and enhance the spectral detection resolution, but realizing a Fano lineshape with both a narrow linewidth and high spectral contrast-ratio is still challenging. Here we propose a metallic nanostructure consisting of a concentric square ring-disk (CSRD) nanostructure and an outside nanorod. Fano linewidth and spectral contrast ratio can be actively manipulated by adjusting the gap between the nanorod and CSRD, and by adjusting the gap between the ring and disk in CSRD. When the gap size in CSRD is reduced to 5 nm, the quadrupolar Fano linewidth is of 0.025 eV, with a contrast ratio of 80%, and the figure of merit reaches 15. Full article
(This article belongs to the Section Physical Sensors)
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