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

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Nanowires for Biosensing: Lightguiding of Fluorescence as a Function of Diameter and Wavelength
Nano Letters ( IF 9.6 ) Pub Date : 2018-07-12 00:00:00 , DOI: 10.1021/acs.nanolett.8b01360
Damiano Verardo _{1,

2} , Frida W. Lindberg _{1,

2} , Nicklas Anttu _{1,

2} , Cassandra S. Niman _{1,

3} , Mercy Lard _{1,

2} , Aleksandra P. Dabkowska _{1,

4} , Tommy Nylander _{1,

4} , Alf Månsson _{1,

5} , Christelle N. Prinz _{1,

2} , Heiner Linke _{1,

2}

Affiliation

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.

中文翻译：

用于生物传感的纳米线：荧光的光导随直径和波长的变化

半导体纳米线可以充当纳米级光纤，使它们能够引导和聚集表面结合的荧光团发出的光，从而有可能增强光学生物传感的灵敏度。尽管可以预期诸如纳米线几何形状和荧光团波长之类的参数会强烈影响这种导光效果，但迄今为止尚无关于其对荧光发射耦合的影响的详细描述。在这里，我们使用共聚焦成像来量化GaP纳米线中的导光效果，作为纳米线几何形状和光波长的函数。结合有限差分时域模拟和分析方法，我们确定了多个波导模式对于观察到的光导的作用。归一化的频率参数，基于阶跃指数逼近，

更新日期：2018-07-12

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