ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
We present a nonoptical shear-force feedback method to regulate tip–sample distance for near-field scanning optical microscopy. In the shear force setup, the dither piezo and the attached fiber tip form an electromechanical system, whose power dissipation on resonance is sensitive to the change in damping force as the tip approaches and interacts with the sample. At the frequencies of interest (∼10–100 kHz), the change in power dissipation is conveniently manifested as a change in the electrical impedance of the dither piezo. We demonstrate that tip–sample distance feedback control can be achieved by measuring this change in dither piezo impedance. The sensitivity is currently ∼0.5 A(ring). This new technique is compared to other methods currently used for distance control in near-field scanning optical microscopy. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1145547
Permalink