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Chin. Phys. B, 2010, Vol. 19(12): 123201    DOI: 10.1088/1674-1056/19/12/123201

Broadening of Cr nanostructures in laser-focused atomic deposition

Lu Xiang-Dong(卢向东), Li Tong-Bao(李同保), and Ma Yan(马艳)
Department of Physics, Tongji University, Shanghai 200092, China
Abstract  This paper presents the experimental progress of laser-focused Cr atomic deposition and the experimental condition. The result is an accurate array of lines with a periodicity of 212.8±0.2 nm and mean full-width at half maximum as approximately 95 nm. Surface growth in laser-focused Cr atomic deposition is modeled and studied by kinetic Monte Carlo simulation including two events: the one is that atom trajectories in laser standing wave are simulated with the semiclassical equations of motion to obtain the deposition position; the other is that adatom diffuses by considering two major diffusion processes, namely, terrace diffusion and step-edge descending. Comparing with experimental results (Anderson W R, Bradley C C, McClelland J J and Celotta R J 1999 Phys. Rev. A59 2476), it finds that the simulated trend of dependence on feature width is in agreement with the power of standing wave, the other two simulated trends are the same in the initial stage. These results demonstrate that some surface diffusion processes play important role in feature width broadening. Numerical result also shows that high incoming beam flux of atoms deposited redounds to decrease the distance between adatoms which can diffuse to minimize the feature width and enhance the contrast.
Keywords:  atom optics      laser-focused atomic deposition      kinetic Monte Carlo simulation      surface growth  
Received:  29 May 2010      Revised:  22 August 2010      Accepted manuscript online: 
PACS:  42.62.-b (Laser applications)  
  61.46.-w (Structure of nanoscale materials)  
  66.30.Fq (Self-diffusion in metals, semimetals, and alloys)  
  68.35.Fx (Diffusion; interface formation)  
  68.43.Mn (Adsorption kinetics ?)  
Fund: Project supported by the Nanoscience Foundation of Shanghai, China (Grant Nos. 0852nm07000 and 0952nm07000), the National Natural Science Foundation of China (Grant No. 10804084), and the National Science & Technology Support Project (Grant No. 2006BAF06B08).

Cite this article: 

Lu Xiang-Dong(卢向东), Li Tong-Bao(李同保), and Ma Yan(马艳) Broadening of Cr nanostructures in laser-focused atomic deposition 2010 Chin. Phys. B 19 123201

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