THz near-field Faraday imaging in hybrid metamaterials.

Published

Journal Article

We report on direct measurements of the magnetic near-field of metamaterial split ring resonators at terahertz frequencies using a magnetic field sensitive material. Specifically, planar split ring resonators are fabricated on a single magneto-optically active terbium gallium garnet crystal. Normally incident terahertz radiation couples to the resonator inducing a magnetic dipole oscillating perpendicular to the crystal surface. Faraday rotation of the polarisation of a near-infrared probe beam directly measures the magnetic near-field with 100 femtosecond temporal resolution and (λ/200) spatial resolution. Numerical simulations suggest that the magnetic field can be enhanced in the plane of the resonator by as much as a factor of 200 compared to the incident field strength. Our results provide a route towards hybrid devices for dynamic magneto-active control of light such as isolators, and highlight the utility of split ring resonators as compact probes of magnetic phenomena in condensed matter.

Full Text

Cited Authors

  • Kumar, N; Strikwerda, AC; Fan, K; Zhang, X; Averitt, RD; Planken, PCM; Adam, AJL

Published Date

  • May 2012

Published In

Volume / Issue

  • 20 / 10

Start / End Page

  • 11277 - 11287

PubMed ID

  • 22565750

Pubmed Central ID

  • 22565750

Electronic International Standard Serial Number (EISSN)

  • 1094-4087

International Standard Serial Number (ISSN)

  • 1094-4087

Digital Object Identifier (DOI)

  • 10.1364/oe.20.011277

Language

  • eng