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- W3202906045 abstract "Narrowband terahertz (THz) radiation is crucial for high-resolution spectral identification, but a narrowband THz source driven by femtosecond (fs) laser has remained scarce. Here, it is computationally predicted that a metal/dielectric/magnetoelastic heterostructure enables converting a fs laser pulse into a multi-cycle THz pulse with a narrow linewidth down to ~1.5 GHz, which is in contrast with the single-cycle, broadband THz pulse from the existing fs-laser-excited emitters. It is shown that such narrowband THz pulse originates from the excitation and long-distance transport of THz spin waves in the magnetoelastic film, which can be enabled by a short strain pulse obtained from fs laser irradiation of the metal film when the thicknesses of the metal and magnetoelastic films both fall into a specific range. These results therefore reveal an approach to achieving optical generation of narrowband THz pulse based on heterostructure design, which also has implications in the design of THz magnonic devices." @default.
- W3202906045 created "2021-10-11" @default.
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- W3202906045 date "2020-05-01" @default.
- W3202906045 modified "2023-10-17" @default.
- W3202906045 title "A Narrowband Spintronic Terahertz Emitter based on Magnetoelastic Heterostructures" @default.
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- W3202906045 doi "https://doi.org/10.48550/arxiv.2005.00629" @default.
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