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- Title
Ablation phenomena by intense terahertz vortex beam.
- 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
- Abstract
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, Ge2Sb2Te5 and GeTe/Sb2Te3. 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.
- Publication
Applied Physics A: Materials Science & Processing, 2022, Vol 128, Issue 9, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-022-05970-7