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

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8p-S5-4] Mechanism of the quench-rate dependence of femtosecond-laser energy absorption in amorphous Si

〇Eiyu Gushiken¹, Tomohito Otobe^1,2, Arqum Hashmi¹, Mizuki Tani^1,2, Shunsuke Yamada², Kenichi L. Ishikawa¹ (1.UTokyo, 2.KPSI)

Keywords:

Ablation,Time-Dependent Density Functional Theory (TDDFT),Amorphous silicon

Amorphous silicon (a-Si) layers formed by femtosecond laser processing can influence the absorption of subsequent laser pulses. In this study, we performed first-principles calculations based on time-dependent density functional theory (TDDFT) for 512-atom a-Si models prepared with different cooling rates and investigated the relationship between structural distortion and optical energy absorption. The results show that the absorbed energy depends more strongly on network-scale structural features, such as bond-angle distortion, than on the concentration of coordination defects.