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首页> 外文期刊>Optics Letters >Tuning the detection sensitivity: a model for axial backfocal plane interferometric tracking
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Tuning the detection sensitivity: a model for axial backfocal plane interferometric tracking

机译:调整检测灵敏度:轴向后焦平面干涉跟踪模型

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Backfocal plane (BFP) interferometry is a single particle tracking technique that allows one to measure minute displacements of a microscopic particle from the center of a beam's focus in three dimensions. In this Letter, we present a Fourier optics model to describe the interference effects that allow one to track the position of a particle moving along the optical axis. A detection numerical aperture is derived theoretically and confirmed experimentally, within which the interference intensity has a positive correlation with the axial position of the scatterer. For larger detection angles, the correlation is negative. The model helps to understand previously reported measurements and to optimize BFP interferometric tracking.
机译:后焦平面(BFP)干涉测量法是一种单粒子跟踪技术,它可以在三个维度上测量微观粒子从光束焦点中心的微小位移。在这封信中,我们提出了一个傅立叶光学模型来描述干涉效应,该干涉效应使人们可以跟踪沿光轴移动的粒子的位置。从理论上推导了检测数值孔径,并通过实验确定了该数值孔径,其中干涉强度与散射体的轴向位置呈正相关。对于较大的检测角度,相关性为负。该模型有助于了解先前报告的测量结果并优化BFP干涉测量跟踪。

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