Effect of laser parameters and assist gas on spectral response of silicon fibrous nanostructure
- Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3 (Canada)
- Department of Aerospace Engineering, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3 (Canada)
This article report, for the first time, the influence of laser parameters on the spectral response of weblike silicon fibrous nanostructures. These nanostructures are formed by femtosecond laser irradiation at megahertz pulse frequency under atmosphere and nitrogen ambient. The observed decreasing in reflectance is correlated with the density of fibrous nanostructures and the size of the agglomerated nanoparticles. Compared to bulk silicon, Raman spectra of fibrous nanostructures shows a downward shift and asymmetric broadening at the first order phonon peak. The shift and broadening are attributed to phonon confinement of fibrous nanostructure. Polarization and nitrogen gas modify the morphology of generated nanomaterials but does not have effect on light absorptance. Pulsewidth and pulse frequency do not have significant effect on light absorptance.
- OSTI ID:
- 21476616
- Journal Information:
- Journal of Applied Physics, Vol. 108, Issue 9; Other Information: DOI: 10.1063/1.3505755; (c) 2010 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Plasmon Enhanced Photoemission
Hybrid silicon–carbon nanostructures for broadband optical absorption
Related Subjects
36 MATERIALS SCIENCE
ASYMMETRY
LASER RADIATION
MORPHOLOGY
NANOSTRUCTURES
NITROGEN
PHONONS
POLARIZATION
PULSES
RAMAN SPECTRA
REFLECTIVITY
SEMICONDUCTOR LASERS
SILICON
SPECTRAL REFLECTANCE
SPECTRAL RESPONSE
VISIBLE RADIATION
ELECTROMAGNETIC RADIATION
ELEMENTS
LASERS
NONMETALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASI PARTICLES
RADIATIONS
SEMICONDUCTOR DEVICES
SEMIMETALS
SOLID STATE LASERS
SPECTRA
SURFACE PROPERTIES