Dark mode–Faraday rotation synergy for enhanced magneto-optics

Y. Mazor, M. Meir, and Ben Z. Steinberg
Phys. Rev. B 95, 035115 – Published 10 January 2017

Abstract

We examine the efficacy of dark-mode plasmonics as a platform for enhanced magneto-optics. The dark mode of a small particle consists of two co-existing equal-intensity and mutually opposing dipolar excitations. Each of these two opposing dipoles may even resonate at or near the dark-mode frequency, but the net dipole moment vanishes due to the mutual cancellation between the opposing dipoles. We show that application of external magnetic bias may alleviate the intense destructive interference. Furthermore, under external magnetic bias the opposing dark resonances of a plasmonic particle shift in opposite directions and create a region of extremely sensitive Faraday rotation. We show that the magnetized dark resonance in a lossless Ag-like particle may provide more than 20 degrees rotation under magnetic fields of the order of 1–2 Tesla, exhibiting magnetoplasmonic activity that is 2–3 orders of magnitude larger than that observed in a conventional plasmonic particle of the same material.

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  • Received 7 February 2016
  • Revised 12 December 2016

DOI:https://doi.org/10.1103/PhysRevB.95.035115

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. Mazor, M. Meir, and Ben Z. Steinberg*

  • School of Electrical Engineering, Tel-Aviv University, Ramat Aviv, Tel-Aviv 69978 Israel

  • *steinber@eng.tau.ac.il

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Issue

Vol. 95, Iss. 3 — 15 January 2017

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