Journal
OPTICS EXPRESS
Volume 20, Issue 10, Pages 11277-11287Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.011277
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Funding
- VENI
- VICI from Netherlands Organisation for Scientific Research (NWO)
- DOE-BES [DE-FG02-09ER46643]
- AFOSR [FA9550-09-1-0708]
- Photonics Center
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0802036] Funding Source: National Science Foundation
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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 (lambda/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. (C) 2012 Optical Society of America
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