Radio Frequency Circuitry for Atomic Force Microscopy up to 100 MHz
作者:
Dai Kobayashi,
Shigeki Kawai,
Hideki Kawakatsu,
期刊:
AIP Conference Proceedings
(AIP Available online 1903)
卷期:
Volume 696,
issue 1
页码: 180-187
ISSN:0094-243X
年代: 1903
DOI:10.1063/1.1639693
出版商: AIP
数据来源: AIP
摘要:
We developed a control circuitry for non‐contact atomic force microscopy which generates a self‐excited vibration in a cantilever with a frequency up to 100 MHz, and detects its frequency modulation by a novel frequency demodulation technique. The circuitry was tested by applying it to an AFM whose tip vibration was parallel to sample surface. While the self‐excitation loop has only a simple superheterodyne configuration, the excited vibration was as stable as we could obtain a topographic image of Si (111)‐(7×7) surface with frequency feedback. The frequency demodulator is based on IQ (in‐phase and quadrature‐phase) direct frequency conversion to zero Hz intermediate frequency and operations including differentiations, multiplications and a subtraction between these signals. It was implemented as an analog circuit. We obtained an atomic step image in graphite by using this demodulator in frequency regulation feedback. © 2003 American Institute of Physics
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