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Nanowires for Biosensing: Lightguiding of Fluorescence as a Function of Diameter and Wavelength
Lund University, Sweden.ORCID iD: 0000-0002-8372-1617
Lund University, Sweden.ORCID iD: 0000-0001-5617-6337
Lund University, Sweden;AstraZeneca, Sweden.
Lund University, Sweden;University of California San Diego, USA.
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2018 (English)In: Nano Letters, ISSN 1530-6984, E-ISSN 1530-6992, Vol. 18, no 8, p. 4796-4802Article in journal (Refereed) Published
Abstract [en]

Semiconductor nanowires can act as nanoscaled optical fibers, enabling them to guide and concentrate light emitted by surface-bound fluorophores, potentially enhancing the sensitivity of optical biosensing. While parameters such as the nanowire geometry and the fluorophore wavelength can be expected to strongly influence this lightguiding effect, no detailed description of their effect on in-coupling of fluorescent emission is available to date. Here, we use confocal imaging to quantify the lightguiding effect in GaP nanowires as a function of nanowire geometry and light wavelength. Using a combination of finite-difference time-domain simulations and analytical approaches, we identify the role of multiple waveguide modes for the observed lightguiding. The normalized frequency parameter, based on the step-index approximation, predicts the lightguiding ability of the nanowires as a function of diameter and fluorophore wavelength, providing a useful guide for the design of optical biosensors based on nanowires.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 18, no 8, p. 4796-4802
Keywords [en]
Nanowires, III-V, fluorescence, confocal microscopy, biosensing, waveguiding
National Category
Biochemistry Molecular Biology
Research subject
Chemistry, Biochemistry
Identifiers
URN: urn:nbn:se:lnu:diva-78105DOI: 10.1021/acs.nanolett.8b01360ISI: 000441478300025PubMedID: 30001138Scopus ID: 2-s2.0-85049998667OAI: oai:DiVA.org:lnu-78105DiVA, id: diva2:1252404
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2025-02-20Bibliographically approved

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Månsson, Alf

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