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Broadband localized electric field enhancement produced by a single-element plasmonic nanoantenna
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2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 4, p. 2074-2080Article in journal (Refereed) Published
Abstract [en]

We propose a novel design of a broadband plasmonic nanoantenna, investigate it numerically using finite-difference time-domain methods, and explain its performance using the analysis of charge distribution in addition to a multipole expansion. The custom-designed single-element nanoantenna consists of a modified gold ring structure with a bowtie-shaped spike inside. In contrast to the spectral response of extinction, the broadband localized electric field intensity enhancement is achieved over a bandwidth of 850 nm in the near infrared spectrum. Up to 26- and 22-fold field enhancements near the bowtie spike are obtained at the peak and even in the dip region of the extinction spectrum, respectively. Moreover, the nanostructure exhibits high tunability of its spectral features by modifying the structural parameters. We further demonstrate that the proposed nanoantenna can provide broadband spontaneous emission rates and quantum efficiency enhancements when a low-quantum efficiency emitter is introduced.

Place, publisher, year, edition, pages
RSC Publishing, 2017. Vol. 7, no 4, p. 2074-2080
Keywords [en]
Efficiency, Electric fields, Finite difference time domain method, Infrared devices, Metamaterial antennas, Nanoantennas, Near infrared spectroscopy, Plants (botany), Plasmons, Time domain analysis, Efficiency enhancement, Electric field enhancement, Electric field intensities, Multipole expansions, Near infrared spectra, Plasmonic nanoantenna, Spontaneous emission rates, Structural parameter, Quantum efficiency
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-201761DOI: 10.1039/c6ra26703cISI: 000393748000039Scopus ID: 2-s2.0-85009354505OAI: oai:DiVA.org:kth-201761DiVA, id: diva2:1075791
Note

Funding text: This work was partially supported by the National Natural Science Foundation of China (No. 91233208 and 61178062), the National High Technology Research and Development Program (863 Program) of China (No. 2013AA014401), the Program of Zhejiang Leading Team of Science and Technology Innovation, and Swedish VR grant (No. 621-2011-4620).

QC 20170221

Available from: 2017-02-21 Created: 2017-02-21 Last updated: 2017-11-29Bibliographically approved

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