THz near-field Faraday imaging in hybrid metamaterials

Optics Express
Nishant KumarAurèle J L Adam

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.

References

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Citations

Jul 8, 2016·Science Advances·Rayko Ivanov StantchevEuan Hendry
Oct 31, 2019·Advanced Materials·Xiaoguang ZhaoXin Zhang
Mar 14, 2013·Optics Express·Hyun Woo KihmDai-Sik Kim
Mar 24, 2020·Physical Review Letters·Vasileios BalosMohsen Sajadi
May 6, 2017·Physical Review Letters·Yongzheng Wen, Ji Zhou
Sep 25, 2019·Research : a Science Partner Journal·Yongzheng Wen, Ji Zhou

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