Evolution of Laser-Induced Specific Nanostructures on SiGe Compounds via Laser Irradiation Intensity Tuning

IEEE Photonics Journal

Songyan Chen¹  Dongfeng Qi¹  Peng Wang¹  Hongkai Lai¹  Wei Huang¹  Kai Huang¹  Xin Li¹  Cheng Li¹ 

[1] Department of Physics, Xiamen University, Xiamen, China;

关键词: Laser processing;    optical interference;    microstructure;    nanocrystalline materials;   

DOI  :  10.1109/JPHOT.2013.2294631

来源: DOAJ

【 摘 要 】

We have presented the mechanisms of nanosecond laser-induced specific nanostructures on a SiGe film by changing laser irradiation intensities. Our experimental results show that the types of the formed nanostructures were sensitive to the laser intensity because the structures such as cone-like protrusions, islands, and droplet-like ripples upon the irradiated SiGe film successively transform to ripple structures as the irradiation intensity decreases. Moreover, we obtain the threshold of the laser intensity for each nanostructure. Further studies give compelling evidence that the laser irradiation undergoes a transition from an initial thermal effect to an optical interference, which results in the evolution of SiGe nanostructures.

【 授权许可】

Unknown