Abstract
In this article, we study the optical force exerted on nanorods. In recent years, the capture of micro-nanoparticles has been a frontier topic in optics. A Photonic Jet (PJ) is an emerging subwavelength beam with excellent application prospects. This paper studies the optical force exerted by photonic jets generated by a plane wave illuminating a Generalized Luneburg Lens (GLLs) on nanorods. In the framework of the dipole approximation, the optical force on the nanorods is studied. The electric field of the photonic jet is calculated by the open-source software package DDSCAT developed based on the Discrete Dipole Approximation (DDA). In this paper, the effects of the nanorods’ orientation and dielectric constant on the transverse force Fx and longitudinal force Fy are analyzed. Numerical results show that the maximum value of the positive force and the negative force are equal and appear alternately at the position of the photonic jet. Therefore, to capture anisotropic nanoscale-geometries (nanorods), it is necessary to adjust the position of GLLs continuously. It is worth emphasizing that manipulations with nanorods will make it possible to create new materials at the nanoscale.
Highlights
Optical capture by manipulating neutral atoms by lasers was first reported by Ashkin et al in 1970 [1]
The second section introduces the theory of Discrete Dipole Approximation (DDA) and DDSCAT to calculate the near-field scattering, and analyzes the theory of force on nanorod in the dipole approximation framework
We will analyze2 the Fx, longitudinal force Fy and Fz exerted by the photonic jet on apnanorod
Summary
Optical capture by manipulating neutral atoms by lasers was first reported by Ashkin et al in 1970 [1]. We use the dipole approximation method to numerically simulate the optical force exerted by the photonic jet on the nanorods. DDA has studied scattering by first dividing particles of any shape into dipole arrays (polarizable) whose size is negligible compared to the wavelength [25]. DDSCAT is software suitable for calculating the scattered field of GLLs. Dipole approximation [28] is a common method for numerical simulating the optical force exerted on nanostructures. Dipole approximation [28] is a common method for numerical simulating the optical force exerted on nanostructures In this calculation model, the nanostructure is regarded as a dipole (the size is almost negligible). The second section introduces the theory of DDA and DDSCAT to calculate the near-field scattering, and analyzes the theory of force on nanorod in the dipole approximation framework.
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