[18p-B2-1~15] 4.6 Terahertz Photonics

3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[18p-B2-8] Low and High Spatial Frequency Periodic Surface Structure Formation
under Terahertz Free Electron Laser Irradiation

〇(D)Youwei Wang¹, Zihao Yang¹, Kosaku Kato¹, Verdad C. Agulto¹, Kotaro Makino², Junjii Tominaga², Goro Isoyama³, Makoto Nakajima¹ (1.ILE, Osaka Univ., 2.AIST, 3.SANKEN, Osaka Univ.)

Keywords:

LIPSS,THz-FEL,GST

Our study focused on the formation of laser-induced periodic surface structures (LIPSS) on Ge₂Sb₂Te₅ a phase change recording material, using a terahertz free electron laser with a fluence up to 35 J/cm². Two types of LIPSS emerged: one running parallel and the other perpendicular to the direction of laser polarization. The spacings of the former and of the latter corresponded to approximately 1/4 wavelength and 1/18 wavelength, respectively.