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

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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

22 Citeringar (SciVal)

Sammanfattning

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.
Originalspråkengelska
Sidor (från-till)4796–4802
TidskriftNano Letters
Volym18
Utgåva8
DOI
StatusPublished - 2018 juli 12

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