振动纳米光栅对纳米颗粒的超分辨率空间频率微分
Super-resolution Spatial Frequency Differentiation of Nanoscale Particles with a Vibrating Nanograting
摘要：
提出了一种基于空间特征的深亚波长粒子探测和鉴别方案。我们的方法结合了从超声波调制的纳米图案光栅与外差技术的散射，使高空间频率傅立叶分量的远场检测。我们的系统是敏感的空间特征相称的大小图案化规模的光栅。我们解决了玻恩近似的散射问题，并说明了在调制频率上的光栅周期的信号幅度的依赖性，这使得能够区分大小$λ/20$的模型纳米粒子。
英文摘要：
We propose a scheme for detecting and differentiating deeply subwavelength particles based on their spatial features. Our approach combines scattering from an ultrasonically modulated nanopatterend grating with heterodyne techniques to enable far-field detection of high spatial frequency Fourier components. Our system is sensitive to spatial features commensurate in size to the patterning scale of the grating. We solve the scattering problem in Born approximation and illustrate the dependence of the signal amplitude at modulation frequency on grating period, which allows to differentiate between model nanoparticles of size $λ/20$.
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