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arXiv 2406.04442physics.optics
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紧聚焦后传播产生的复杂远场与光学奇点:波前曲率与孔径衍射的综合效应

Complex far fields and optical singularities due to propagation beyond tight focusing: combined effects of wavefront curvature and aperture diffraction

Nitish Kumar, Anirban Debnath, Nirmal K. Viswanathan

AI总结:

本文通过模拟与实验研究紧聚焦后准直过程中波前曲率与孔径衍射共同导致的复杂远场和光学奇点,证明这些偏差本身具有基础光学研究价值,并提出减少偏差的方法及未来研究方向。

摘要:

所有涉及反射、透射或散射波在紧聚焦之后进行准直的光学系统,都会受到两类偏差的影响。一类是由于所考虑的界面或散射粒子焦点位置不准确而产生的波前曲率,另一类是由有限透镜孔径引起的衍射。本文通过严格的模拟模型和相应的实验装置,详细探讨了这些现象。我们由此展示了所观测远场的复杂强度分布和光学奇点特征。然后,我们描述了在一般实验中尽量减少这些偏差的方法。但更重要的是,我们的分析证明,这些偏差本身就是具有基础研究意义的重要光学现象。所观测到的复杂场分布与标准衍射受限紧聚焦场有相似之处,尽管我们的场探测方式与标准方案不同。这表明这些复杂场与涉及波前曲率和孔径衍射的更广泛系统类别具有相关性。本文的详细分析和结果已经构成对这些光学现象的核心探索;我们还提出了未来的研究方向,在这些方向上可以有针对性地创造并进一步探索这些系统特性。

英文摘要:

All optical systems, which involve the collimation of a reflected, transmitted or scattered wave subsequent to tight focusing, are subject to two kinds of deviations. One is the wavefront curvature due to inaccurate focal placement of the interface or scatterer particle under consideration, and the other is the diffraction caused by the finite lens aperture. In the present paper we explore these phenomena in detail by considering a rigorous simulated model and an appropriate experimental setup. We hence demonstrate the complicated intensity profiles and optical singularity characteristics of the observed far field. Then we describe ways to minimize these deviations in a general experiment. But more importantly, our analysis proves that these deviations by themselves are significant optical phenomena of fundamental interest. The observed complex field profiles have similarities to standard diffraction-limited tight focal fields, though our field detection is different from the standard schemes. This indicates the relevance of these complex fields to a larger class of systems involving wavefront curvature and aperture diffraction. The detailed analysis and results of the present paper already serve as core explorations of these optical phenomena; and we also suggest future research directions where these system aspects can be purposefully created and explored further.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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