Enhancing terahertz magnetic near field induced by a micro-split-ring resonator with a tapered waveguide

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2018
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Qiu, Hongsong
Harada, Hirofumi
Kato, Kosaku
Takano, Keisuke
Suemoto, Tohru
Tani, Masahiko
Sarukura, Nobuhiko
Yoshimura, Masashi
Nakajima, Makoto
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Optics Letters. 2018, 43(8), pp. 1658-1661. ISSN 0146-9592. eISSN 1539-4794. Available under: doi: 10.1364/OL.43.001658
Zusammenfassung

Substantial enhancement of terahertz magnetic near field achieved by the combination of a tapered metallic waveguide and a micro-split-ring resonator is demonstrated. The magnetic near field is probed directly via the magneto-optic sampling with a Tb3Ga5O12 crystal. The incident terahertz wave with a half-cycle waveform is generated by using the pulse-front tilting method. The magnetic near field at the resonant frequency is enhanced by more than 30 times through the combination of the waveguide and the resonator. The peak amplitude of the magnetic field with a damped oscillation waveform in the time domain is up to 0.4 T. The resonant frequency can be tuned by adopting different resonator designs. The mechanism of the enhancement is analyzed by performing calculations based on the finite element method. The strong terahertz magnetic near field enables the excitation of large-amplitude spin dynamics and can be utilized for an ultrafast spin control.

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ISO 690QIU, Hongsong, Takayuki KURIHARA, Hirofumi HARADA, Kosaku KATO, Keisuke TAKANO, Tohru SUEMOTO, Masahiko TANI, Nobuhiko SARUKURA, Masashi YOSHIMURA, Makoto NAKAJIMA, 2018. Enhancing terahertz magnetic near field induced by a micro-split-ring resonator with a tapered waveguide. In: Optics Letters. 2018, 43(8), pp. 1658-1661. ISSN 0146-9592. eISSN 1539-4794. Available under: doi: 10.1364/OL.43.001658
BibTex
@article{Qiu2018-04-15Enhan-42487,
  year={2018},
  doi={10.1364/OL.43.001658},
  title={Enhancing terahertz magnetic near field induced by a micro-split-ring resonator with a tapered waveguide},
  number={8},
  volume={43},
  issn={0146-9592},
  journal={Optics Letters},
  pages={1658--1661},
  author={Qiu, Hongsong and Kurihara, Takayuki and Harada, Hirofumi and Kato, Kosaku and Takano, Keisuke and Suemoto, Tohru and Tani, Masahiko and Sarukura, Nobuhiko and Yoshimura, Masashi and Nakajima, Makoto}
}
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