Figure | Dual-beam cascaded LOTB. (IMAGE)
Caption
Figure | Dual-beam cascaded LOTB. a. Schematic of implementing the dual-beam cascaded LOTB. A strong puncture-beam has a smaller diameter and high-intensity while a relatively weak flattening-beam has a larger diameter and low-intensity, which control the high-temp and low-temp field regions, respectively. b. Simulated temperature distribution (black line) under the irradiation of two Gaussian lasers (green lines), consisting of a puncture-beam (with an intensity of 106.1 mW/µm2 and a spot diameter of 0.3 µm) and a flattening-beam (with an intensity of 1.3 mW/µm2 and a spot diameter of 5 µm). The red and blue regions indicate the high-temp field region and low-temp field region, respectively. c and d are AFM topography images of a 1L-MoS2 sample with nanobubbles before and after the dual-beam cascaded LOTB treatment, respectively. The dashed lines indicate the sacrifice region and flattened region. e. Confocal PL mapping images of the same sample area as that in (d) after laser irradiation. f. Surface roughness statistics of the flattened region before and after LOTB.
Credit
Benfeng Bai et al.
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Credit must be given to the creator.
License
CC BY