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

Verardo, Damiano LU ; Lindberg, Frida LU ; Anttu, Nicklas LU ; Niman, Cassandra LU ; Lard, Mercy LU ; Dabkowska, Aleksandra LU ; Nylander, Tommy LU ; Månsson, Alf ; Prinz, Christelle LU and Linke, Heiner LU orcid (2018) In Nano Letters 18(8). p.4796-4802
Abstract
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... (More)
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. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
18
issue
8
pages
4796 - 4802
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:30001138
  • scopus:85049998667
ISSN
1530-6984
DOI
10.1021/acs.nanolett.8b01360
language
English
LU publication?
yes
id
cf177e43-ee82-448a-8970-a495bcd642db
date added to LUP
2018-10-21 20:02:14
date last changed
2021-10-06 03:31:26
@article{cf177e43-ee82-448a-8970-a495bcd642db,
  abstract     = {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.},
  author       = {Verardo, Damiano and Lindberg, Frida and Anttu, Nicklas and Niman, Cassandra and Lard, Mercy and Dabkowska, Aleksandra and Nylander, Tommy and Månsson, Alf and Prinz, Christelle and Linke, Heiner},
  issn         = {1530-6984},
  language     = {eng},
  month        = {07},
  number       = {8},
  pages        = {4796--4802},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Nano Letters},
  title        = {Nanowires for Biosensing: Lightguiding of Fluorescence as a Function of Diameter and Wavelength},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.8b01360},
  doi          = {10.1021/acs.nanolett.8b01360},
  volume       = {18},
  year         = {2018},
}