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Peer-reviewedCC BY-NCNanoscale advances

Exceptionally high Verdet constant in gold nanodisc arrays

  • Gajendra Mulay1,2
  • Shraddha Choudhary1,3
  • Ashwin A Tulapurkar4
  • Daria O Ignatyeva5
  • Vladimir I Belotelov5
  • Shriganesh S Prabhu1
  • Venu Gopal Achanta1,6
6 affiliations
  1. 1Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research Mumbai 400005 India [email protected].
  2. 2Center for Research in Nanotechnology and Science, Indian Institute of Technology Bombay Mumbai 400076 India.
  3. 3Institute of Physics and Center for Nanotechnology, University of Münster Münster 48149 Germany.
  4. 4Department of Electrical Engineering, Indian Institute of Technology Bombay Mumbai 400076 India.
  5. 5Faculty of Physics, Lomonosov Moscow State University Moscow 119992 Russia.
  6. 6On Lien at CSIR-National Physical Laboratory Dr K.S. Krishnan Marg New Delhi 110012 India.
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Abstract

Magneto-optical effects in non-magnetic noble metals can be invoked by leveraging the in-plane Lorentz force at engineered plasmonic resonances. We demonstrate a 2-D array of gold nanodiscs designed to host a hybrid resonance of localized plasmon and surface lattice modes. The structure exhibits a Verdet constant of 1.98 × 10⁶°·T⁻¹ m⁻¹, corresponding to a Faraday rotation of -0.15° at a 1 T magnetic field. This Verdet constant represents a 15-fold enhancement over a continuous, unpatterned gold film of the same thickness measured under identical conditions and is highly competitive with many plasmon-enhanced diamagnetic nanostructures. Numerical simulations show that the magnetic field independent rotation is due to structure imperfections and thus with better tolerance in nanofabrication, one could get much higher absolute Faraday rotation at these resonances. These findings offer new opportunities for harnessing strong magneto-plasmonic effects in optoelectronic devices by patterning non-magnetic metal contacts.

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Cite

BibTeXRIS
BibTeX
@article{mulay2026exceptionally,
  title = {{Exceptionally high Verdet constant in gold nanodisc arrays}},
  author = {Gajendra Mulay and Shraddha Choudhary and Ashwin A Tulapurkar and Daria O Ignatyeva and Vladimir I Belotelov and Shriganesh S Prabhu and Venu Gopal Achanta},
  journal = {Nanoscale advances},
  year = {2026},
  month = oct,
  doi = {10.1039/d6na00610h},
  url = {https://europepmc.org/article/PMC/PMC13717621},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - Exceptionally high Verdet constant in gold nanodisc arrays
AU  - Gajendra Mulay
AU  - Shraddha Choudhary
AU  - Ashwin A Tulapurkar
AU  - Daria O Ignatyeva
AU  - Vladimir I Belotelov
AU  - Shriganesh S Prabhu
AU  - Venu Gopal Achanta
PY  - 2026
DA  - 2026/10/12
JO  - Nanoscale advances
DO  - 10.1039/d6na00610h
UR  - https://europepmc.org/article/PMC/PMC13717621
AB  - Magneto-optical effects in non-magnetic noble metals can be invoked by leveraging the in-plane Lorentz force at engineered plasmonic resonances. We demonstrate a 2-D array of gold nanodiscs designed to host a hybrid resonance of localized plasmon and surface lattice modes. The structure exhibits a Verdet constant of 1.98 × 10⁶°·T⁻¹ m⁻¹, corresponding to a Faraday rotation of -0.15° at a 1 T magnetic field. This Verdet constant represents a 15-fold enhancement over a continuous, unpatterned gold film of the same thickness measured under identical conditions and is highly competitive with many plasmon-enhanced diamagnetic nanostructures. Numerical simulations show that the magnetic field independent rotation is due to structure imperfections and thus with better tolerance in nanofabrication, one could get much higher absolute Faraday rotation at these resonances. These findings offer new opportunities for harnessing strong magneto-plasmonic effects in optoelectronic devices by patterning non-magnetic metal contacts.
SN  - 2516-0230
ER  -