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Portrait of Heiner Linke; Photo: Kennet Ruona

Heiner Linke

Professor, Deputy dean at Faculty of Engineering, LTH

Portrait of Heiner Linke; Photo: Kennet Ruona

Nanowires for Biosensing: Lightguiding of Fluorescence as a Function of Diameter and Wavelength

Author

  • Damiano Verardo
  • Frida Lindberg
  • Nicklas Anttu
  • Cassandra Niman
  • Mercy Lard
  • Aleksandra Dabkowska
  • Tommy Nylander
  • Alf Månsson
  • Christelle Prinz
  • Heiner Linke

Summary, in English

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.

Department/s

  • Solid State Physics
  • NanoLund
  • Physical Chemistry

Publishing year

2018-07-12

Language

English

Pages

4796-4802

Publication/Series

Nano Letters

Volume

18

Issue

8

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Other Physics Topics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1530-6984