Ideal Magnetic Dipole Scattering

Tianhua Feng, Yi Xu, Wei Zhang, and Andrey E. Miroshnichenko
Phys. Rev. Lett. 118, 173901 – Published 25 April 2017
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Abstract

We introduce the concept of tunable ideal magnetic dipole scattering, where a nonmagnetic nanoparticle scatters light as a pure magnetic dipole. High refractive index subwavelength nanoparticles usually support both electric and magnetic dipole responses. Thus, to achieve ideal magnetic dipole scattering one has to suppress the electric dipole response. Such a possibility was recently demonstrated for the so-called anapole mode, which is associated with zero electric dipole scattering. By spectrally overlapping the magnetic dipole resonance with the anapole mode, we achieve ideal magnetic dipole scattering in the far field with tunable strong scattering resonances in the near infrared spectrum. We demonstrate that such a condition can be realized at least for two subwavelength geometries. One of them is a core-shell nanosphere consisting of a Au core and silicon shell. It can be also achieved in other geometries, including nanodisks, which are compatible with current nanofabrication technology.

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  • Received 17 January 2017

DOI:https://doi.org/10.1103/PhysRevLett.118.173901

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalGeneral Physics

Authors & Affiliations

Tianhua Feng1, Yi Xu1,2,*, Wei Zhang1, and Andrey E. Miroshnichenko3,†

  • 1Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
  • 2Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Guangzhou, Guangdong 510632, China
  • 3Nonlinear Physics Centre, Research School of Science and Engineering, Australian National University, Acton, Australian Capital Territory 2601, Australia

  • *e_chui@qq.com
  • andrey.miroshnichenko@anu.edu.au

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Issue

Vol. 118, Iss. 17 — 28 April 2017

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