Laser-Induced Periodic Surface Structures on Ge2Sb2Te5 Irradiated by Terahertz Free-Electron Laser Vortex Beam
- Resource Type
- Conference
- Authors
- Wang, Youwei; Segawa, Sadashi; Shimizu, Tomoki; Ota, Masato; Agulto, Verdad C.; Mag-Usara, Valynn Katrine; Miyamoto, Katsuhiko; Omatsu, Takashige; Makino, Kotaro; Tominaga, Junji; Isoyama, Goro; Asakawa, Makoto; Nakajima, Makoto
- Source
- 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) Infrared, Millimeter and Terahertz Waves (IRMMW-THz),2022 47th International Conference on. :1-2 Aug, 2022
- Subject
- Aerospace
Bioengineering
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Signal Processing and Analysis
Spirals
Free electron lasers
Surface structures
Laser ablation
Laser beams
- Language
- ISSN
- 2162-2035
Laser-induced ablation of Ge2Sb2Te2 using terahertz vortex beam was investigated. Intense terahertz pulses from a free-electron laser were made to pass through a Tsurupica spiral phase plate to generate the vortex beam. Laser-induced periodic surface structures (LIPSS) were formed with a period quarter of the wavelength and an orientation parallel to the beam polarization. Due to the singularity of the vortex beam, LIPSS formation was not observed at the center of the irradiated spot.