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원자제어 저차원 전자계 연구단
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Postprocessing Algorithm for Driving Conventional Scanning Tunneling Microscope at Fast Scan Rates

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Title
Postprocessing Algorithm for Driving Conventional Scanning Tunneling Microscope at Fast Scan Rates
Author(s)
Hao Zhang; Xianqi Li; Yunmei Chen; Jewook Park; An-Ping Li; X.-G. Zhang
Publication Date
2017-11
Journal
SCANNING, v.2017, no., pp.1097142 -
Publisher
WILEY-BLACKWELL
Abstract
We present an image postprocessing framework for Scanning Tunneling Microscope (STM) to reduce the strong spurious oscillations and scan line noise at fast scan rates and preserve the features, allowing an order of magnitude increase in the scan rate without upgrading the hardware.The proposed method consists of two steps for large scale images and four steps for atomic scale images. For large scale images, we first apply for each line an image registration method to align the forward and backward scans of the same line. In the second step we apply a “rubber band” model which is solved by a novel Constrained Adaptive and Iterative Filtering Algorithm (CIAFA). The numerical results on measurement from copper(111) surface indicate the processed images are comparable in accuracy to data obtained with a slow scan rate, but are free of the scan drift error commonly seen in slow scan data. For atomic scale images, an additional first step to remove line-by-line strong background fluctuations and a fourth step of replacing the postprocessed image by its ranking map as the final atomic resolution image are required.The resulting image restores the lattice image that is nearly undetectable in the original fast scan data. 1. Introduction © 2017 Hao Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
URI
http://pr.ibs.re.kr/handle/8788114/4164
DOI
/10.1155/2017/1097142
ISSN
0161-0457
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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