AI 中文总结
研究光频率通过共振时光学梯度力的变化，利用广义Fano线形模型定量分析，通过全波模拟验证，在此基础上实现硅纳米颗粒的三维奇点捕获，建立了控制共振系统光学力的设计原则。
AI 中文摘要
在原子物理学中，调整光频率通过共振会使亮场和暗场区域之间的捕获力反转，但尚未建立适用于一般光子谐振器的该原理的统一分析描述。本文表明，扫过粒子或器件光学响应中的共振的入射波长会引起π相移，使梯度力从吸引变为排斥。广义的Fano线形模型在从等离子体纳米颗粒到高Q超表面的物理上不同的共振系统中定量地捕捉了这一点，全波模拟在每种情况下都证实了预测。基于此框架，使用反向传播矢量光束和超表面展示了硅纳米颗粒的三维奇点捕获，捕获势深度与传统亮场陷阱相当。这些结果为控制共振系统中的光学力建立了一个与平台无关的设计原则，对光学操纵、量子光力学和精密计量学具有广泛的意义。
英文摘要
In atomic physics, tuning the light frequency across a resonance reverses the trapping force between bright and dark field regions, yet a unified analytical description of this principle applicable to photonic resonators in general has not been established. Here we show that sweeping the incident wavelength through a resonance in the optical response of the particle or device induces a $π$ phase shift, reversing the gradient force from attractive to repulsive. A generalized Fano line-shape model captures this quantitatively across physically distinct resonant systems, from plasmonic nanoparticles to high-Q metasurfaces, with full-wave simulations confirming the predictions in every case. Building on this framework, three-dimensional singularity trapping of silicon nanoparticles is demonstrated using counter-propagating vector beams and metasurfaces, with trapping potential depths competitive with conventional bright-field traps. These results establish a platform-independent design principle for controlling optical forces in resonant systems, with broad implications for optical manipulation, quantum optomechanics, and precision metrology.
Comments6 pages, 4 figures
