27,28 Therefore, the use of femtosecond lasers in LIBS has shown an increasing trend in recent years. 29,30 In addition, a crater size smaller than the focused-beam spot size can be obtained through adjusting the laser energy threshold for ablation, by taking advantage of the Gaussian spatial distribution of laser beams, 31,32 which makes it possible to obtain submicron craters. 21 Additionally, using a near-field technique to avoid the diffraction limit is also an effective strategy to improve the resolution of LIBS.
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Nanoscale laser-induced breakdown spectroscopy imaging reveals chemical distribution with subcellular resolution.
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