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Broadening of Cr nanostructures in laser-focused atomic deposition

Chinese Physics B 2010年第12期19卷 168-173页

作者：卢向东李同保马艳 Department of Physics Tongji University

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. A 59 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.

关键词： atom optics laser-focused atomic deposition kinetic Monte Carlo simulation surface growth

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Diffraction of entangled photon pairs by ultrasonic waves

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Frontiers of physics 2012年第2期7卷 239-243页

作者：邓履璧 1. Department of Physics Southeast University Nanjing 210096 China

In this paper, we have presented and established a new theoretical formulation of photon optics based on photon path and Feynman path integral idea. We have used Feynman path integral ap- proach to discuss Fraunhofer, Fresnel diffraction of single photon and entangled photon pairs by ultrasonic wave and obtained the following results： i） quantum state and probability distribution of single photon and entangled photon pairs by Fraunhofer and Fresnel ultrasonic diffraction, ii） oblique incidence Raman-Nath and Bragg diffraction conditions, iii） total correlation state and its probability distribution. Our calculation results are in agreement with the experiment results. Comparing one-photon and two-photon diffraction effects by ultrasonic waves, we have found that two-photon diffraction by ultrasonic waves is also a sub-wavelength diffraction.

关键词： atom optics diffraction and interference path integral

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X-ray fluorescence spectra quantitative analysis based on characteristic spectra optimization of partial least-squares method

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Chinese optics Letters 2014年第A02期12卷 144-148页

作者：章炜段连飞张罗政张玉钧凌六一杨允军 New Star Research Institute of Applied Technology Hefei 230031 China Key Laboratory of Environment optics and Technology Anhui Institute of Optics ~nd Fine Mechanics the Chinese Academy of Sciences Hefei 230031 Chin~

The quantitative analysis of X-ray fluorescence （XRF） spectra is studied using the partial least-squares （PLS） method. The characteristic variables of spectra matrix of PLS are optimized by genetic algorithm. The subset of multi-component characteristic spectra matrix is established which is corresponding to their concentration. The individual fitness is calculated which combines the crossover validation parameters （prediction error square summation） and correlation coefficients （R^2）. The experimental result indicates that the predicated values improve using the PLS model of characteristic spectra optimization. Compared to the nonoptimized XRF spectra, the linear dependence of processed spectra averagely decreases by about 7%, root mean square error of calibration averagely increases by about 79.32, and root mean square error of cross-validation avera^elv increases by about 14.2.

关键词： 300.6560 Spectroscopy, x-ray 020.1335 atom optics

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