Damping behavior of bent fiber NSOM probes in water

The damping behavior of bent fiber near-field scanning optical microscopy (NSOM) probes operating in tapping mode oscillation is investigated in air and water. We show that the significant drop in probe quality factor Q, which occurs at the air-water interface, is due to meniscus damping. As the probe is immersed in water viscous damping adds to the meniscus damping. Damping effects which lead to a progressive drop in the peak tapping mode resonance frequency are accounted for by additional torsional modes of probe vibration. Understanding the damping processes should lead to the design of high sensitivity NSOM probes for scanning soft biological samples under liquid.


Published in:
Journal of Applied Physics, 107, 043526
Year:
2010
Publisher:
American Institute of Physics
ISSN:
0021-8979
Keywords:
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 Record created 2010-08-20, last modified 2018-03-18

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