Single Out-of-Resonance Dielectric Nanoparticles as Molecular Sensors,ACS Sensors

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Single Out-of-Resonance Dielectric Nanoparticles as Molecular Sensors
ACS Sensors ( IF 8.2 ) Pub Date : 2021-02-22 , DOI: 10.1021/acssensors.0c02629
Sirin Celiksoy ₁ , Weixiang Ye _{1,

2} , Rubén Ahijado-Guzmán ₁ , Carsten Sönnichsen ₁

Affiliation

Light scattering from single nanoparticles and nanostructures is a commonly used readout method for nanosensors. Increasing the spectral sensitivity of resonant nanosensors to changes in their local surrounding has been the focus of many studies. Switching from spectral to intensity monitoring allows one to investigate nonresonant or out-of-resonance dielectric nanoparticles. Here, we systematically compared such dielectric silica nanoparticles with plasmonic gold nanorods by deriving analytical expressions and by performing experiments. The experiments show a similar sensitivity for the detection of an adsorbate layer for both particle types, which is in good agreement with theory. The flat spectral response of dielectric silica nanoparticles simplifies the choice of illumination wavelength. Furthermore, such dielectric nanoparticles can be made from many oxides, polymers, and even biological assemblies, broadening the choice of materials for the nanosensor.

中文翻译：

单个失谐介电纳米粒子作为分子传感器

来自单个纳米颗粒和纳米结构的光散射是纳米传感器的一种常用读出方法。提高共振纳米传感器对其局部周围环境变化的光谱敏感性一直是许多研究的重点。从频谱监控切换为强度监控，可以研究非共振或共振以外的介电纳米粒子。在这里，我们通过推导分析表达式并进行实验，系统地比较了这种电介质二氧化硅纳米粒子与等离激元金纳米棒。实验表明，对于两种颗粒类型的吸附物层检测，其灵敏度都相似，这与理论相吻合。介电二氧化硅纳米粒子的平坦光谱响应简化了照明波长的选择。此外，

更新日期：2021-03-26

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