Nanowires for Biosensing: Lightguiding of Fluorescence as a Function of Diameter and Wavelength
| Autor: | Heiner Linke, Mercy Lard, Nicklas Anttu, Tommy Nylander, Christelle N. Prinz, Alf Månsson, Frida Lindberg, Cassandra Niman, Damiano Verardo, Aleksandra P. Dabkowska |
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| Rok vydání: | 2018 |
| Předmět: |
Letter
Materials science Optical fiber Fluorophore Light Phosphines Surface Properties Nanowire Physics::Optics Gallium Bioengineering Biosensing Techniques 02 engineering and technology confocal microscopy 010402 general chemistry waveguiding 01 natural sciences Fluorescence law.invention Condensed Matter::Materials Science chemistry.chemical_compound law Aluminum Oxide General Materials Science Particle Size III−V Optical Fibers Fluorescent Dyes Nanowires business.industry Mechanical Engineering General Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Wavelength Normalized frequency (fiber optics) Semiconductor Semiconductors chemistry Optoelectronics biosensing 0210 nano-technology business Biosensor |
| Zdroj: | Nano Letters |
| ISSN: | 1530-6984 |
| DOI: | 10.1021/acs.nanolett.8b01360 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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