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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 10 — May. 7, 2012
  • pp: 11277–11287

THz near-field Faraday imaging in hybrid metamaterials

Nishant Kumar, Andrew C. Strikwerda, Kebin Fan, Xin Zhang, Richard D. Averitt, Paul C. M. Planken, and Aurèle J. L. Adam  »View Author Affiliations


Optics Express, Vol. 20, Issue 10, pp. 11277-11287 (2012)
http://dx.doi.org/10.1364/OE.20.011277


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Abstract

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.

© 2012 OSA

OCIS Codes
(160.3820) Materials : Magneto-optical materials
(160.3918) Materials : Metamaterials
(180.4243) Microscopy : Near-field microscopy
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Metamaterials

History
Original Manuscript: March 7, 2012
Revised Manuscript: April 10, 2012
Manuscript Accepted: April 10, 2012
Published: May 2, 2012

Virtual Issues
May 29, 2012 Spotlight on Optics

Citation
Nishant Kumar, Andrew C. Strikwerda, Kebin Fan, Xin Zhang, Richard D. Averitt, Paul C. M. Planken, and Aurèle J. L. Adam, "THz near-field Faraday imaging in hybrid metamaterials," Opt. Express 20, 11277-11287 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-10-11277


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