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Enantiomer-Selective Molecular Sensing Using Racemic Nanoplasmonic Arrays
Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Barcelona 08860, Spain..
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics. Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Barcelona 08860, Spain.ORCID iD: 0000-0002-4437-6291
Univ Politecn Cataluna, Dept Engn Elect, ES-08034 Barcelona, Spain..
Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Barcelona 08860, Spain.;ICREA, Barcelona 08010, Spain..ORCID iD: 0000-0001-8995-8976
2018 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 18, no 10, p. 6279-6285Article in journal (Refereed) Published
Abstract [en]

Building blocks of life show well-defined chiral symmetry which has a direct influence on their properties and role in Nature. Chiral molecules are typically characterized by optical techniques such as circular dichroism (CD) where they exhibit signatures in the ultraviolet frequency region. Plasmonic nanostructures have the potential to enhance the sensitivity of chiral detection and translate the molecular chirality to the visible spectral range. Despite recent progress, to date, it remains unclear which properties plasmonic sensors should exhibit to maximize this effect and apply it to reliable enantiomer discrimination. Here, we bring further insight into this complex problem and present a chiral plasmonic sensor composed of a racemic mixture of gammadions with no intrinsic CD, but high optical chirality and electric field enhancements in the near-fields. Owing to its unique set of properties, this configuration enables us to directly differentiate phenylalanine enantiomers in the visible frequency range.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 18, no 10, p. 6279-6285
Keywords [en]
Biosensing, chiral sensing, plasmonics, optical chirality, enantiomers
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-238131DOI: 10.1021/acs.nanolett.8b02433ISI: 000447355400023PubMedID: 30216716Scopus ID: 2-s2.0-85053884638OAI: oai:DiVA.org:kth-238131DiVA, id: diva2:1262945
Note

QC 20181113

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2018-11-13Bibliographically approved

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Svedendahl, Mikael

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