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

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

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QIU, 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. 43(8), pp. 1658-1661. ISSN 0146-9592. eISSN 1539-4794. Available under: doi: 10.1364/OL.43.001658

@article{Qiu2018-04-15Enhan-42487, title={Enhancing terahertz magnetic near field induced by a micro-split-ring resonator with a tapered waveguide}, year={2018}, doi={10.1364/OL.43.001658}, 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} }

Qiu, Hongsong Enhancing terahertz magnetic near field induced by a micro-split-ring resonator with a tapered waveguide Suemoto, Tohru Yoshimura, Masashi Nakajima, Makoto Kato, Kosaku 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 Tb<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> 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. 2018-04-15 Tani, Masahiko eng Takano, Keisuke Suemoto, Tohru Kato, Kosaku Harada, Hirofumi Kurihara, Takayuki Sarukura, Nobuhiko Sarukura, Nobuhiko Nakajima, Makoto Takano, Keisuke Kurihara, Takayuki Qiu, Hongsong Harada, Hirofumi Tani, Masahiko Yoshimura, Masashi 2018-05-30T14:21:51Z 2018-05-30T14:21:51Z

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