Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities

Alberto López-Ortega; Mario Zapata-Herrera; Nicolò Maccaferri; Matteo Pancaldi; Mikel Garcia; Andrey Chuvilin; Paolo Vavassori

doi:10.1038/s41377-020-0285-0

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Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities

Article

- Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities
- Light: Science & Applications Vol. 9, Issue 2, Pages: 434-447(2020)
- Affiliations：
  
  1.CIC nanoGUNE - BRTA, Donostia–San Sebastian, Donostia 20018, Spain
  2.Department of Physics and Materials Science, University of Luxembourg, L- 1511 Luxembourg, Luxembourg
  3.Department of Physics, Stockholm University, 106 91 Stockholm, Sweden
  4.IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain
- Author bio：
  
  Alberto López-Ortega (lopezortega.alberto@gmail.com)
  Paolo Vavassori (p.vavassori@nanogune.eu)
- Funds：
- DOI：10.1038/s41377-020-0285-0
  CLC：
- Published：2020，
  
  Published Online：30 March 2020，
  
  Received：02 September 2019，
  
  Revised：23 February 2020，
  
  Accepted：09 March 2020
- Accepted：
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López-Ortega, A. et al. Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities. Light: Science & Applications, 9, 434-447 (2020).
DOI：

López-Ortega, A. et al. Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities. Light: Science & Applications, 9, 434-447 (2020). DOI： 10.1038/s41377-020-0285-0.

摘要

Abstract

Enhancing magneto-optical effects is crucial for reducing the size of key photonic devices based on the non-reciprocal propagation of light and to enable active nanophotonics. Here

we disclose a currently unexplored approach that exploits hybridization with multipolar dark modes in specially designed magnetoplasmonic nanocavities to achieve a large enhancement of the magneto-optically induced modulation of light polarization. The broken geometrical symmetry of the design enables coupling with free-space light and hybridization of the multipolar dark modes of a plasmonic ring nanoresonator with the dipolar localized plasmon resonance of the ferromagnetic disk placed inside the ring. This hybridization results in a low-radiant multipolar Fano resonance that drives a strongly enhanced magneto-optically induced localized plasmon. The large amplification of the magneto-optical response of the nanocavity is the result of the large magneto-optically induced change in light polarization produced by the strongly enhanced radiant magneto-optical dipole

which is achieved by avoiding the simultaneous enhancement of re-emitted light with incident polarization by the multipolar Fano resonance. The partial compensation of the magneto-optically induced polarization change caused by the large re-emission of light with the original polarization is a critical limitation of the magnetoplasmonic designs explored thus far and that is overcome by the approach proposed here.

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references

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