Temporal Variation of Nano-Enhanced Laser Induced Plasma Spectroscopy (NELIPS)

The NELIPS acronym stands for Nano-Enhanced Laser Induced Plasma Spectroscopy. Within this framework, the temporal variation of the enhanced plasma emission from pure nanomaterials with respect to corresponding bulk materials was monitored as a function of delay time in the range from 1 to 5-11 ms. Six different materials were employed including silver, zinc, aluminum, titanium, iron and silicon . Radiation from pulsed Nd: YAG laser at wavelength 1064 nm was used to induce the bulk and pure nanomaterial plasmas under similar experimental conditions. Plasma emission from both targets was monitored via optical emission spectroscopy technique (OES). The spectral line intensities (signal-to-noise ratio S/N) from the pure nanomaterial plasma turn out to decline in a constant logarithmic manner but at a slower rate than that from the corresponding bulk material plasma. Consequently, the measured average enhanced emission from different nanomaterials features an increase in an exponential manner with delay time. This trend was accounted for by a mathematical elaboration of enhanced emission based on the measured signal-to-noise data. Both plasma parameters (electron density and temperature) evolution during plasma expansion has been illustrated as well.