Journal
OPTICS EXPRESS
Volume 26, Issue 12, Pages 15247-15254Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.015247
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Funding
- Japan Society for the Promotion of Science (JSPS) [16H03886]
- NEDO of Ministry of Economy, Trade and Industry of Japan (METI)
- Ministry of Education, Culture, Sports, Science and Technology, Japan [F-17-OS-0024, S-17-OS-0024]
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The emission with a bandwidth of 1.5 terahertz based on the spin current in the ferromagnetic heterostructure Co/Pt is demonstrated. The spin transient launched by the NIR femtosecond laser pulse in the Co/Pt is converted into the in-plane charge current due to the inverse spin Hall effect, which gives rise to the terahertz emission towards free space. The dependence of the terahertz emission on the Pt-layer thickness is investigated. To optimize the geometry structure of the new type of emitter, we developed the theoretical model by carefully analyzing the spin transport. Our model reveals the importance to take into account the interfacial spin loss. It can be used to analyze more complex heterostructures. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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