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Macroscopic Layers of Chiral Plasmonic Nanoparticle Oligomers from Colloidal Lithography
Chalmers, Dept Appl Phys, Gothenburg, Sweden.
Chalmers, Dept Appl Phys, Gothenburg, Sweden.
Chalmers, Dept Appl Phys, Gothenburg, Sweden.
Örebro University, School of Science and Technology. Chalmers, Dept Appl Phys, Gothenburg, Sweden.ORCID iD: 0000-0002-2110-3071
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2014 (English)In: ACS PHOTONICS, ISSN 2330-4022, Vol. 1, no 10, 1074-1081 p.Article in journal (Refereed) Published
Abstract [en]

Optical near-field coupling between closely spaced plasmonic metal nanoparticles is important to a range of nanophotonic applications of high contemporary interest, including surface-enhanced molecular spectroscopy, nanooptical sensing, and various novel light-harvesting concepts. Here we report on monolayers of chiral heterotrimers and heterotetramers composed of closely spaced silver and/or gold nanodisks of different heights fabricated through facile hole-mask colloidal lithography. These quasi-three-dimensional oligomers are interesting for applications because they exhibit "hot" gaps and crevices of nanometric dimensions, a pronounced circular dichroism, and optical chirality in the visible to near-infrared wavelength range, and they can be produced in large ensembles (>109) of identical orientation. We analyze the optical properties of the samples based on simulation results and find that the circular dichroism is due to strong near-field coupling and intricate phase retardation effects originating in the three-dimensional character of the individual oligomers.

Place, publisher, year, edition, pages
2014. Vol. 1, no 10, 1074-1081 p.
Keyword [en]
plasmonics, optical chirality, circular dichroism, hole-mask colloidal lithography, oligomers, numerical simulation
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-38652DOI: 10.1021/ph500293uISI: 000343276800022OAI: oai:DiVA.org:oru-38652DiVA: diva2:763768
Funder
Knut and Alice Wallenberg FoundationSwedish Foundation for Strategic Research
Note

Funding Agency:

Chalmers Nanoscience and Nanotechnology Area of Advance

Available from: 2014-11-17 Created: 2014-11-17 Last updated: 2017-10-17Bibliographically approved

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CiteExportLink to record
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