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首页> 外文会议>Conference on reporters, markers, dyes, nanoparticles, and molecular probes for biomedical applications >A study of optical anisotropy for nearly spherical gold nanoparticles: toward a sensitive detection using polarization microscopy in biomolecular applications
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A study of optical anisotropy for nearly spherical gold nanoparticles: toward a sensitive detection using polarization microscopy in biomolecular applications

机译：几种球形金纳米颗粒的光学各向异性研究：朝向生物分子应用中偏振显微镜的敏感性检测

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摘要

Anisotropic metal nanoparticles strongly change the scattered light polarization compared with isotropic nanoparticles, and this property can be utilized in a sensitive bimolecular recognition due to the high contrast that could be achieved in polarization microscopy. We report a study of the shape anisotropy in nearly spherical gold nanoparticles and particle dimers. It was obvious that each particle has its own scattering polarization dependence which reflects the relative changes in morphologies. Our experimental results reveal that particles with minimum anisotropy don't change the scattering light polarization which indicates their homogenous shape. Another particles show polarization dependence scattering intensity due to pronounced anisotropy. Particle dimers possess shape anisotropy that is characterized by a different polarizability for each axis in the nanostructure. We resolved the internal inhomogeneity in single particles and particle dimers using a qualitative analysis which enabled us to determine the polarizabilities of both long and short axes for each particle and particle pair. A few of single particles show a strong optical anisotropy relative to their shape anisotropy, and even this observation was not yet clarified, it could be used in a sensitive bimolecular detection.
机译：与各向同性纳米颗粒相比，各向异性金属纳米颗粒强烈地改变散射光极化，并且该特性可以在偏振显微镜中可以实现的高对比度来利用敏感的双分子识别。我们报告了几乎球形金纳米颗粒和颗粒二聚体中的形状各向异性的研究。显而易见的是，每个颗粒具有自身散射极化依赖性，这反映了形态的相对变化。我们的实验结果表明，具有最小各向异性的颗粒不会改变表示其均匀形状的散射光极化。由于发音各向异性，另一个颗粒显示出极化依赖性散射强度。颗粒二聚体具有形状各向异性，其特征在于纳米结构中的每个轴的不同极化性。我们使用定性分析解决单个颗粒和粒子二聚体中的内部不均匀性，这使我们能够确定每个颗粒和粒子对的长轴和短轴的偏振性。单个单个颗粒具有相对于其形状各向异性的强光学各向异性，甚至尚未澄清这种观察，它可以用于敏感的双分子检测。

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