title: Enhanced Forward Scattering of Ellipsoidal Dielectric Nanoparticles.
abstract: Dielectric nanoparticles can demonstrate a strong forward scattering at visible and near-infrared wavelengths due to the interaction of optically induced electric and magnetic dipolar resonances. For a spherical nanoparticle, the first Kerker's condition within dipole approximation can be realized, where backward scattering can reach zero. However, for this type of dielectric sphere, maximum forward scattering without backward scattering cannot be realized by modulating the refractive index and particle size of this nanoparticle. In this paper, we have demonstrated that a larger directional forward scattering than the traditional spherical nanoparticle can be obtained by using the ellipsoidal nanoparticle, due to the overlapping electric and magnetic dipolar modes. For the oblate ellipsoid with a determined refractive index, there is an optimum shape for generating the suppressed backward scattering along with the enhanced forward scattering at the resonant wavelength, where the electric and magnetic dipolar modes overlap with each other. For the prolate ellipsoid, there also exist the overlapping electric and magnetic dipolar modes at the resonant wavelength of total scattering, which have much higher forward scattering than those for both oblate ellipsoid and sphere, due to the existence of the higher multipolar modes. Furthermore, we have also demonstrated the realization of the dimensional tailoring in order to make the strong forward scattering shift to the desired wavelength.
authors.affiliation: School of Information Science and Technology, University of Science and Technology of China, Hefei, 230026, China.|School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Ning
authors.initials: N
authors.lastname: An
authors.affiliation: School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Shen
authors.affiliation: School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Hongping
authors.initials: H
authors.lastname: Zhou
authors.affiliation: School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Yongxuan
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Zhaoneng
authors.initials: Z
authors.lastname: Jiang
authors.affiliation: Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai, 264209, China.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Han
authors.affiliation: Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai, 264209, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Computer and Information, Hefei University of Technology, Hefei, 230009, China. guozhongyi@hfut.edu.cn.|State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, 210096, China. guozhongyi@hfut.edu.cn.
authors.forename: Zhongyi
authors.initials: Z
authors.lastname: Guo
keywords: Dielectric nanoparticle; Electric and magnetic dipolar resonances; Ellipsoidal nanoparticle; Forward scattering