Coherent terahertz needle radiation emission mechanism from nanostructured ferromagnetic metal films excited by femtosecond laser pulses
Anatoly D. Gladun, Vladimir G. Leiman, and Aleksey V. Arsenin (Moscow, Institute of Physics, Technology (State University))
TL;DR
This paper proposes a new mechanism for generating coherent terahertz needle radiation through femtosecond laser pulses interacting with nanostructured ferromagnetic metal films, based on coupled phonon-magnon modes.
Contribution
It introduces a novel emission mechanism involving coupled phonon-magnon modes excited by femtosecond laser pulses on nanostructured ferromagnetic surfaces.
Findings
Estimated Poynting vector for the terahertz radiation.
Mechanism demonstrated in experimental conditions with femtosecond laser pulses.
Potential for efficient terahertz radiation generation.
Abstract
A coherent terahertz needle radiation emission mechanism is proposed. This mechanism can be realized in the experiments on femtosecond laser pulses interacting with surface of nanostructured ferromagnetic metal film. The proposed mechanism is based on exciting of coupled coherent phonon-magnon modes on a nanostructured metal surface by laser femtosecond pulse. The value of the Poynting vector for the terahertz radiation is estimated.
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Taxonomy
TopicsTerahertz technology and applications · Photonic and Optical Devices · Semiconductor Quantum Structures and Devices