各向异性介电雪人粒子实现对光子钩的改进控制

中文摘要 AI 辅助

本文提出并数值验证了一种利用雪人粒子构型中各向异性介电微粒二聚体控制光子钩（PH）的新颖高效方法。与现有依赖结构化照明、部分屏蔽或复杂形态的方案不同，所提出的各向异性几何结构采用由两个部分重叠的圆柱体组成的简单且易于制造的形状。采用有限元方法研究了上部粒子（雪人粒子的头部）的不对称程度、空间旋转和光学性质如何影响光子钩的弯曲角度和最大强度。首次证明，调整这些参数可以实现单光子钩和双光子钩模式之间的有意切换，以及控制钩的方向和曲率，包括焦区的碎裂。该方法在利用入射辐射方面具有高效率，制造简单，且光子钩特性具有广泛的可调性。这些发现为开发紧凑型近场光学器件铺平了道路，例如光镊、高分辨率显微镜、传感器和表面微结构加工工具。

英文摘要

A novel efficient method for controlling photonic hook (PH) with an anisotropic dielectric microparticle dimer in the snowman-particle configuration is introduced and numerically justified. In contrast to existing schemes that rely on structured illumination, partial shielding, or complex morphologies, the proposed anisometric geometry utilizes a simple and easily manufacturable form composed of two partially overlapping cylinders. The finite element method was employed to study how the degree of asymmetry, spatial rotation, and optical properties of the upper particle (the head of the snowman-particle) affect the bending angle and maximum intensity of PH. For the first time, it has been demonstrated that adjusting these parameters allows for the deliberate switching between single and double PH modes, as well as controlling the direction and curvature of the hook, including the fragmentation of the focal area. This approach offers high efficiency in utilizing incident radiation, simplicity in fabrication, and broad tunability of PH characteristics. The findings pave the way for the development of compact near-field optical devices, such as optical traps, high-resolution microscopes, sensors, and tools for surface microstructuring.

发表机构

• V.E. Zuev Institute of Atmospheric Optics（V.E. Zuev大气光学研究所）
• Tomsk Polytechnic University（托木斯克理工大学）

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