Femtosecond and picosecond ablation of aluminum for synthesis of nanoparticles and nanostructures and their optical characterization

Syed Hamad; G. Krishna Podagatlapalli; S. Sreedhar; Surya P. Tewari; S. Venugopal Rao

doi:10.1117/12.906962

16 February 2012 Femtosecond and picosecond ablation of aluminum for synthesis of nanoparticles and nanostructures and their optical characterization

Syed Hamad, G. Krishna Podagatlapalli, S. Sreedhar, Surya P. Tewari, S. Venugopal Rao

Author Affiliations +

Proceedings Volume 8245, Synthesis and Photonics of Nanoscale Materials IX; 82450L (2012) https://doi.org/10.1117/12.906962
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

In this paper we report the fabrication of nanoparticles and nanostructures through the interaction of ultrashort (~40 fs) and short (~2 ps) laser pulses with bulk Aluminum immersed in various liquid media of different polarity [chloroform which is polar, carbon tetrachloride which is non-polar, water which is polar, dichloromethane (DCM) which is polar, and Cyclohexane which is non-polar] using the laser ablation technique. Except water and Cyclohexane, other media showed yellow coloration after ablation took place indicating formation of nanoparticles in the solution in both fs and ps domains. The coloration of the laser exposed portion in the Al substrate was golden yellow and its closer view depicted micro-grating (~1-2 μm) and nano-ripple (period 330 nm) formation depending on the focal conditions. The investigation of polarization dependence on the ablation was performed for water media. Depending on the ablation threshold, we observed micron sized structures and nano-ripples on the surface. As the rate of ablation depends on the position of the focus on the Al substrate and beam waist parameters, we have studied the liquid level dependence of ablation with different water levels on the Al substrate and we compared these patterns obtained below, near, and above the ablation thresholds of the sample. Field Emission-Scanning Electron Microscope (FE-SEM), UV-Vis absorption spectra, Electron Diffraction Pattern and Transmission Electron Microscope (TEM) were used for the characterization and comparison of products in both domains.

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Syed Hamad, G. Krishna Podagatlapalli, S. Sreedhar, Surya P. Tewari, and S. Venugopal Rao "Femtosecond and picosecond ablation of aluminum for synthesis of nanoparticles and nanostructures and their optical characterization", Proc. SPIE 8245, Synthesis and Photonics of Nanoscale Materials IX, 82450L (16 February 2012); https://doi.org/10.1117/12.906962

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