Properties of the 3D photonic nanojet based on the refractive index of surroundings |
| |
| Authors: | Hongxing Ding Lili Dai and Changchun Yan |
| |
| Affiliation: | [1]Department of Physics, Lianyungang Teachers College, Lianyungang 222006, China [2]Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China [3]School of Physics and Electronic Engineering, Xuzhou Normal University, Xuzhou 221116, China |
| |
| Abstract: | We exhibit a three-dimensional(3D) photonic nanojet based on a dielectric microsphere irradiated by a plane wave with the finite-difference time-domain(FDTD) method.We investigate the influence of the refractive index of the surrounding on the properties of the nanojet by simulating the electric field distributions in it.The simulation results show that,by optimally choosing the size of the sphere and the ratio of the refractive indices of the sphere and the surrounding,the focus point can occur just on the surface of the sphere even if the refractive index of the surrounding is changed.Additionally,the peak amplitude of the nanojet increases with increasing the refractive index of the surrounding.However,the decay length and the jet width of the nanojet decrease simultaneously.These effects may have potential applications in observation or manipulation of nano-objects such as antibodies in biology.In nanojet-enabled optical data storage,the photonic nanojet may be also helpful for improving data-storage capacities and retrieval speed by controlling the field amplitude,the decay length,and jet width of the nanojet. |
| |
| Keywords: | |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
