[8p-S5-1~9] 3.6 Laser processing

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8p-S5-3] Femtosecond-Laser Control of Crystal Orientation in Tellurium Thin Films

〇(M2)Takuto Hiraoka¹, Haruyuki Sakurai^1,2, Yuta Kobayashi¹, Arata Mitsuzuka¹, Mizuho Matoba², Masashi Kawaguchi¹, Arata Tsukamoto³, Kuniaki Konishi^1,2, Masamitsu Hayashi¹ (1.Dept. Phys., Univ. Tokyo, 2.IPST, Univ. Tokyo, 3.Nihon Univ.)

Keywords:

tellurium,optical anisotropy,pulsed laser

Tellurium exhibits strong anisotropy in optical absorption and electrical conduction owing to its unique helical-chain crystal structure. Recent studies have shown that the crystal-axis orientation of polycrystalline Te thin films can be controlled after deposition by irradiation with linearly polarized pulsed laser light. In this study, aiming at device applications, we irradiate Te thin films with linearly polarized femtosecond laser pulses and quantitatively evaluate the crystal-axis orientation and surface roughness. By comparing the conditions for orientation change and surface damage, we seek an irradiation window that enables anisotropy control while suppressing surface roughening, providing guidelines for optical and electronic functionality design.