THz near-field Faraday imaging in hybrid metamaterials

N. Kumar, Andrew Strikwerda, K. Fan, X. Zhang, R.D. Averitt, P. Planken, A. Adam

Research output: Contribution to journalJournal articleResearchpeer-review


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
Original languageEnglish
JournalOptics Express
Issue number10
Pages (from-to)11277-11287
Publication statusPublished - 2012
Externally publishedYes

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