Research on the Characteristics of Photonic Nano-jets Based on Dielectric Microspheres with Different Refractive Indices

Chenxuan Ma

doi:10.6911/WSRJ.202501_11(1).0001

Authors

Chenxuan Ma

DOI:

https://doi.org/10.6911/WSRJ.202501_11(1).0001

Keywords:

Photonic Nano-jets (PNJs), Refractive index, Finite-difference time-domain (FDTD) method, Nanoscale applications.

Abstract

Photonic Nano-jets (PNJs) are narrow and high-intensity electromagnetic waves propagating in the medium behind the shaded surface when a plane wave irradiates a lossless dielectric micropillar or microsphere. PNJs were potentially applicable in the fields of nanoscale object detection, nano-manipulation, ultra-diffraction-resolution lithography, low-loss waveguide construction, and ultra-high-density optical storage technology. The study used the finite-difference time-domain (FDTD) method and COMSOL Multiphysics software for numerical simulations, which optimized the simulation process and accurately controlled the physical parameters of the dielectric microspheres, and provided new perspectives for an in-depth understanding of the formation mechanism and propagation properties of PNJs. The simulation results shown that with the increase of the refractive index of dielectric microspheres, the full width at half maximum of PNJs decreases and the electric field strength increases, indicating that the refractive index plays an important role in regulating the properties of PNJs. In addition, the study investigates the effect of microsphere radius on the properties of PNJs and finds that the focal length of PNJs becomes longer as the microsphere radius increases and the focal position is close to the edge of the microsphere. The study looks forward to the application of PNJs in biomedical imaging, photocatalysis and optoelectronics, and points out the future research directions in new material science, numerical simulation optimization, experimental validation and technology development.

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