Surface birefringence of self-assembly periodic nanostructures induced on 6H-SiC surface by femtosecond laser
| Autor: | Jianrong Qiu, Guohong Ma, Quanzhong Zhao, Min Gong, Juan Song, Wenjun Tao, Ye Dai |
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| Rok vydání: | 2016 |
| Předmět: |
Nanostructure
Materials science Scanning electron microscope General Physics and Astronomy 02 engineering and technology 01 natural sciences law.invention symbols.namesake Optics law 0103 physical sciences Irradiation 010302 applied physics Polarized light microscopy Birefringence business.industry Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Laser Surfaces Coatings and Films Femtosecond symbols Optoelectronics 0210 nano-technology business Raman spectroscopy |
| Zdroj: | Applied Surface Science. 363:664-669 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2015.12.096 |
| Popis: | In this paper, we report the birefringence effect of surface self-assembly periodic nanostructures induced on 6H-SiC by femtosecond laser irradiation. Birefringence characteristic (e.g. cross-polarized image), measured by cross polarized microscopy, was found to be controlled by both single pulse energy and scanning velocity. Comparing birefringence measurement results of nanostructures and morphology characterization by Scanning electron microscopy, it is shown that ∼200 nm-period deep-subwavelength periodic ripples (DSWR) plays a dominating role in the birefringence effect. Raman spectra show that the change of retardance with pulse energy and scanning velocity is most possibly caused by the thickness variation of DSWR. Finally, a light attenuator based on a single layer of DSWR structure on 6H-SiC surface was constructed and tested by light source of 800 nm to have a tunable attenuating ratio of 69–100%. |
| Databáze: | OpenAIRE |
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