概括
研究人员使用贝塞尔束探讨了对异质球体的光学拉力. 高级贝塞尔旋束 (HOBVBs) 可以实现异质球的反向运动,扩展光学微操纵中的应用.
科学领域:
- 光学和光子学 在光学和光子学.
- 软物质物理学 软物质物理学
- 纳米技术 纳米技术
背景情况:
- 光学操纵依赖于光对粒子施加的力.
- 贝塞尔束为光学捕捉提供了独特的特性,包括扩展的焦点深度.
- 与同位素粒子相比,非同位素粒子具有独特的散射和力相互作用.
研究的目的:
- 从理论上研究在由高阶贝塞尔旋束 (HOBVBs) 照亮的单轴异轴型球体上的轴向辐射力 (AOF).
- 探索实现可逆运动的光学引力束的条件,用于异性质球体.
- 为了扩大对光学拉力 (OPF) 的理解,从同otropic 到 anisotropic 的球形粒子.
主要方法:
- 使用广义的洛伦兹-米理论 (GLMT) 和散射理论用于单轴球体.
- 应用麦克斯韦的应力张量来导出AOF的分析表达式.
- 通过将理论结果与已知的案例 (同流球,平面波,高斯束) 进行比较来验证理论结果.
主要成果:
- 通过HOBVBs在单轴异轴球体上获得AOF的分析表达式.
- 该研究确定了HOBVBs (l=2,3) 作为异型球体的有效引力束的条件.
- 对异性质球体的光学拉力受到异性质参数和拓电荷的显著影响,与异性质球体不同.
结论:
- 高阶贝塞尔旋束可以诱导异构球体的反向运动,扩大它们在光学微操纵中的应用.
- 这些发现为利用光学引力束来操纵生物和复杂的异型粒子提供了理论基础.
- 不同类型的参数和光束特性极大地影响光学拉力,为粒子控制提供了新的可能性.
相关概念视频
Gauss's Law: Spherical Symmetry
7.5K
A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half...
7.5K
Gauss's Law: Cylindrical Symmetry
7.6K
A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
7.6K
Potential Due to a Polarized Object
398
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
398
Electric Field of a Non Uniformly Charged Sphere
1.5K
Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
1.5K
Hydrostatic Pressure Force on a Curved Surface
1.8K
Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
1.8K
Stokes' Law
1.3K
Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only...
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only...
1.3K


