Improvement of a dynamic scanning force microscope for highest resolution imaging in ultrahigh vacuum

被引:23
作者
Torbruegge, S. [1 ]
Luebbe, J. [1 ]
Troeger, L. [1 ]
Cranney, M. [1 ]
Eguchi, T. [2 ]
Hasegawa, Y. [2 ,3 ]
Reichling, M. [1 ]
机构
[1] Univ Osnabruck, Fachbereich Phys, D-49076 Osnabruck, Germany
[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
[3] Japan Sci & Technol Agcy, PRESTO, Chiyoda Ku, Tokyo 1020075, Japan
关键词
D O I
10.1063/1.2964119
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We report on a modification of a commercial scanning force microscope (Omicron UHV AFM/STM) operated in noncontact mode (NC-AFM) at room temperature in ultrahigh vacuum yielding a decrease in the spectral noise density from 2757 to 272 fm/root Hz. The major part of the noise reduction is achieved by an exchange of the originally installed light emitting diode by a laser diode placed outside the vacuum, where the light is coupled into the ultrahigh vacuum chamber via an optical fiber. The setup is further improved by the use of preamplifiers having a bandpass characteristics tailored to the cantilever resonance frequency. The enhanced signal to noise ratio is demonstrated by a comparison of atomic resolution images on CeO(2)(111) obtained before and after the modification. (C) 2008 American Institute of Physics.
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页数:7
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