Nanostructures synthesis by femtosecond laser ablation of glasses J. Appl. Phys. 112, 073109 (2012); 10.1063/1.4754864 Effect of laser parameters and assist gas on spectral response of silicon fibrous nanostructure Enhancement of silicon nanostructures generation using dual wavelength double pulse femtosecond laser under ambient condition J. Appl. Phys. 107, 044307 (2010); 10.1063/1.3309422 Blackbody emission under laser excitation of silicon nanopowder produced by plasma-enhanced chemicalvapor deposition

This article presents 3-D aluminum micro-nanostructures for enhanced light absorption. Periodic microhole arrays were created by firing a train of femtosecond laser pulses at megahertz pulse frequency onto the surface of an aluminum target at ambient conditions. The laser trains ablated the target surface and created microholes leading to the generation of deposited nanostructures inside and around the microholes. These micro-nanostructures showed enhanced light absorption, which is attributed to surface plasmonics induced by the generation of both nano- and microstructures. These micro-nanostructures may be promising for solar cell applications.

Articles you may be interested inInfluence of catalytic gold and silver metal nanoparticles on structural, optical, and vibrational properties of silicon nanowires synthesized by metal-assisted chemical etching J. Appl. Phys. 112, 073509 (2012); 10.1063/1.4757009 Enhancement of silicon nanostructures generation using dual wavelength double pulse femtosecond laser under ambient condition J. Appl. Phys. 107, 044307 (2010); 10.1063/1.3309422 Enhancement in optical absorption of silicon fibrous nanostructure produced using femtosecond laser ablation Appl. Phys. Lett. 95, 034107 (2009);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.

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