Radiationless anapole states in on-chip photonics

Evelyn Díaz-Escobar; Thomas Bauer; Elena Pinilla-Cienfuegos; Ángela I. Barreda; Amadeu Griol; L. Kuipers; Alejandro Martínez

doi:10.1038/s41377-021-00647-x

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Radiationless anapole states in on-chip photonics

Articles

- Radiationless anapole states in on-chip photonics
- Light: Science & Applications Vol. 10, Issue 11, Pages: 2161-2172(2021)
- Affiliations：
  
  1.Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
  2.Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA, Delft, The Netherlands
  3.Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Straße 15, 07745, Jena, Germany
- Author bio：
  
  L. Kuipers (l.kuipers@tudelft.nl)
  Alejandro Martínez (amartinez@ntc.upv.es)
- Funds：
- DOI：10.1038/s41377-021-00647-x
  CLC：
- Published：30 November 2021，
  
  Published Online：04 October 2021，
  
  Received：23 April 2021，
  
  Revised：06 September 2021，
  
  Accepted：16 September 2021
- Accepted：
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Díaz-Escobar, E. et al. Radiationless anapole states in on-chip photonics. Light: Science & Applications, 10, 2161-2172 (2021).
DOI：

Díaz-Escobar, E. et al. Radiationless anapole states in on-chip photonics. Light: Science & Applications, 10, 2161-2172 (2021). DOI： 10.1038/s41377-021-00647-x.

摘要

Abstract

High-index nanoparticles are known to support radiationless states called anapoles

where dipolar and toroidal moments interfere to inhibit scattering to the far field. In order to exploit the striking properties arising from these interference conditions in photonic integrated circuits

the particles must be driven in-plane via integrated waveguides. Here

we address the excitation of electric anapole states in silicon disks when excited on-chip at telecom wavelengths. In contrast to normal illumination

we find that the anapole condition—identified by a strong reduction of the scattering—does not overlap with the near-field energy maximum

an observation attributed to retardation effects. We experimentally verify the two distinct spectral regions in individual disks illuminated in-plane from closely placed waveguide terminations via far-field and near-field measurements. Our finding has important consequences concerning the use of anapole states and interference effects of other Mie-type resonances in high-index nanoparticles for building complex photonic integrated circuitry.

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references

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