Title
Suitability of AFM cantilevers as wideband acoustic point receivers for the characterization of acoustic sources
Author
Quesson, B.A.J.
van Neer, P.L.M.J.
Es, M.
M.H. van,
Piras, D.
Hatakeyama, K.
Mohtashami, A.
van der Lans, M.J.
Publication year
2020
Abstract
In Subsurface Scanning Probe Microscopy (SSPM), Atomic Force Microscopy (AFM) is combined with ultrasound. The AFM cantilever is used as a receiver. At low frequencies (O(MHz)) the method can be used to measure the stiffness contrast in a sample and at high frequencies (O(GHz)) to measure scattering based contrast. Both variants use modulated excitation signals in combination with the nonlinear tip-sample interaction to downmix the sample top surface displacement close to the resonance frequency of the cantilever. This concept has three advantages: 1) the resonance of the cantilever is used to boost the sensitivity, 2) the downmixing allows the system to record signals in an extremely wide range of carrier frequencies (kHz – GHz), and 3) the cantilever tipsample contact diameter is usually much smaller than 10 nm. The latter implies that spatial averaging effects are negligible up to 100 GHz. Said advantages mean that AFM cantilevers could be useful to characterize acoustic sources. Here, we investigate the suitability of AFM cantilevers as acoustic point receivers to characterize acoustic sources. Investigation with an AFM setup and two sources - one O(MHz) and one O(GHz) – show a good match between the measured response, KLM simulations and the transducers bandwidth, which are promising results for the use of a cantilever as a wideband receiver for high resolution acoustic (transducer) characterization.
Subject
Atomic force microscopy
Scanning probe microscopy
Transducer characterization
Wideband
Defence, Safety and Security
To reference this document use:
http://resolver.tudelft.nl/uuid:4eaee954-80fc-47c4-b9d6-87f42cfdd2d7
TNO identifier
885080
Publisher
IEEE
Source
IEEE International Ultrasonics Symposium (IUS)
Document type
conference paper