Unscrambling Structured Chirality with Structured Light at the Nanoscale Using Photoinduced Force
Unscrambling Structured Chirality with Structured Light at the Nanoscale Using Photoinduced Force
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DOI：
10.1021/acsphotonics.8b00765
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发表时间：
2018-05
期刊：
影响因子：
7
通讯作者：
M. Kamandi;M. Albooyeh;M. Veysi;M. Rajaei;J. Zeng;K. Wickramasinghe;F. Capolino
中科院分区：
文献类型：
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作者：
M. Kamandi;M. Albooyeh;M. Veysi;M. Rajaei;J. Zeng;K. Wickramasinghe;F. Capolino
我们证明了由手性纳米粒子的近场产生的梯度力携带了关于其手性的信息。基于这一物理现象，我们提出了一种新的显微技术，通过利用施加在样品附近的非手性针尖上的光致光学力来预测纳米样品手性的空间特征。针尖-样品相互作用系统被结构光照射，以探测样品磁电极化率的横向和纵向(相对于光束传播方向)分量，作为其利手感的表现，即手性。我们具体证明了尽管圆偏振波足以探测样品的横向极化分量，但不能探测到纵向分量。为了克服这一不足并探索纵向手性，我们提出了一种明智地设计的径向和方位相结合的方法。
We show that the gradient force generated by the near field of a chiral nanoparticle carries information about its chirality. On the basis of this physical phenomenon we propose a new microscopy technique that enables the prediction of spatial features of chirality of nanoscale samples by exploiting the photoinduced optical force exerted on an achiral tip in the vicinity of the test specimen. The tip–sample interactive system is illuminated by structured light to probe both the transverse and longitudinal (with respect to the beam propagation direction) components of the sample’s magnetoelectric polarizability as the manifestation of its sense of handedness, i.e., chirality. We specifically prove that although circularly polarized waves are adequate to detect the transverse polarizability components of the sample, they are unable to probe the longitudinal component. To overcome this inadequacy and probe the longitudinal chirality, we propose a judiciously engineered combination of radially and azimuthally...