Ablation phenomena by intense terahertz vortex beam

We have successfully generated a highly efficient terahertz (THz) vortex beam using a THz free-electron laser incident to a spiral phase plate (SPP). The singularity at the center is apparently observed in the image of the transmitted beam after the SPP. We demonstrate the THz vortex beam-induced la...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2022-09, Vol.128 (9), Article 836
Main Authors: Wang, You Wei, Segawa, Sadashi, Shimizu, Tomoki, Agulto, Verdad C., Mag-usara, Valynn Katrine, Kato, Kosaku, Miyamoto, Katsuhiko, Omatsu, Takashige, Makino, Kotaro, Tominaga, Junji, Isoyama, Goro, Asakawa, Makoto, Nakajima, Makoto
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
COLA 2021/2022
Condensed Matter Physics
Electron beams
Free electron lasers
Laser ablation
Machines
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Phase change materials
Phase plates
Physics
Physics and Astronomy
Processes
S.i. : Cola 2021/2022
Surfaces and Interfaces
Thin Films
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Summary:We have successfully generated a highly efficient terahertz (THz) vortex beam using a THz free-electron laser incident to a spiral phase plate (SPP). The singularity at the center is apparently observed in the image of the transmitted beam after the SPP. We demonstrate the THz vortex beam-induced laser ablation on phase change materials, Ge 2 Sb 2 Te 5 and GeTe/Sb 2 Te 3 . The ablation marks show an annular spatial form and modulated laser-induced periodic surface structures (LIPSS) pattern. These observations can be attributed to the torque of the THz vortex.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-05970-7