scholarly journals Excitation of Vibrational Eigenstates of Coupled Microcantilevers Using Ultrasound Radiation Force

2008 ◽  
Author(s):  
Thomas M. Huber ◽  
Eric T. Ofstad ◽  
Samuel M. Barthell ◽  
Arvind Raman ◽  
Matthew Spletzer
Keyword(s):  
Scanning Probe Microscopy ◽  
Focused Ultrasound ◽  
Laser Doppler Vibrometer ◽  
Radiation Force ◽  
Transverse Mode ◽  
Scanning Probe ◽  
Ultrasound Transducer ◽  
Resonance Frequencies ◽  
Ultrasound Radiation ◽  
The Difference

A coupled pair of 500 μm length microcantilevers was excited using the ultrasound radiation force. The excitation was produced using the difference frequency between the two sidebands of a double-sideband suppressed carrier AM (DSB-SC-AM) waveform centered on 500 kHz that was emitted by a focused ultrasound transducer. A laser Doppler vibrometer measured the frequency response and deflection shapes of the cantilever pair. The measured frequencies of the symmetric and antisymmetric eigenstates of the first transverse mode at 10 kHz excited using the ultrasound radiation force were consistent with frequencies measured using a scanning-probe microscopy system. The ultrasound radiation force was also used to excite the symmetric and antisymmetric eigenstates of the 60 kHz second transverse and 86 kHz first torsional modes. These results demonstrate the capability of using the ultrasound radiation force for excitation of structures in air that are significantly smaller, and with higher resonance frequencies, than in any previous study.

Modeling and estimation of focused ultrasound radiation force for modal excitation

2017 ◽  
Vol 141 (5) ◽  
pp. 3575-3575 ◽  
Author(s):  
Songmao Chen ◽  
Christopher Niezrecki ◽  
Alessandro Sabato ◽  
Peter Avitabile
Keyword(s):  
Focused Ultrasound ◽  
Radiation Force ◽  
Ultrasound Radiation

scholarly journals The use of reference marks for precise tip positioning in scanning probe microscopy

2020 ◽  
Vol 44 (3) ◽  
pp. 420-426
Author(s):  
P.V. Gulyaev
Keyword(s):  
Correlation Coefficient ◽  
Scanning Probe Microscopy ◽  
Recognition Algorithm ◽  
Image Correlation ◽  
Scanning Probe ◽  
Precise Positioning ◽  
Probe Microscopy ◽  
Local Maxima ◽  
The Difference ◽  
Special Points

The article discusses techniques for the precise positioning of a probe tip on the surface under study in scanning probe microscopy. The precise tip positioning is of high importance when studying the same sample with various microscopes, probes, in various environments and conditions. It is offered that the precise positioning should be done by applying on the surface equidistant reference marks with a nanoindentor along a straight line. The article describes a procedure for shifting the microscope’s field of view for detecting the reference marks and subsequently moving the probe along the marks line. A reference marks recognition algorithm is presented. The algorithm is based on the image correlation analysis using a master mark image and the subsequent extraction of special points (at local maxima of the correlation coefficient). A descriptor of mutual distances between the special points and the Pearson coefficient (аs a quantitative criterion of recognition) are used for recognition. Three types of reference marks are considered: a circle, a circle with gradient filling, and a circle with continuous filling. It is shown that the number of the allocated special points can be significantly larger than that of the reference marks. A method for filtering special points is offered. The method is based on the threshold filtering of special points using values of the correlation coefficient. The filtering consists in excluding those special points in whose neighborhood the difference of the maximum and minimum of the correlation coefficient does not exceed a preset threshold. Results confirming the effectiveness of the offered filtering method are presented. Recommendations for choosing the parameters of the recognition and filtering algorithms are given.

Thermal Conductivity Measurement of a Sb2Te3 Phase Change Nanowire

2014 ◽  
Vol 95 ◽  
pp. 120-125
Author(s):  
Abdelhak Saci ◽  
Jean Luc Battaglia ◽  
Andrzej Kusiak ◽  
Indrayush De ◽  
Roberto Fallica ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Contact Resistance ◽  
Phase Change ◽  
Spatial Resolution ◽  
Scanning Probe Microscopy ◽  
Conductivity Measurement ◽  
Thermal Conductivity Measurement ◽  
Scanning Probe ◽  
The Difference

In this work we present the measurements of thermal conductivity of nanowire Sb2Te3 phase change. These measurements are made using a thermal scanning probe microscopy (SThM) operating in regime modulated type 3ω. The spatial resolution of the probe is of the order of 100 nm. The measurement of amplitude and phase are used to identify unknown radius of contact between the nanowire and the sensor parameters, the contact resistance at the interface probe and nanowire and the thermal conductivity of the nanowire. An identification method is used which minimizes the difference between the measured values and those from a simulated model of heat transfer in the materials. This model uses a matched model heat transfer in the probe

scholarly journals Contact resonance frequencies and their harmonics in scanning probe microscopy

2021 ◽  
Author(s):  
Eduardo A. Murillo‐Bracamontes ◽  
Juan J. Gervacio‐Arciniega ◽  
Edgar Cruz‐Valeriano ◽  
Christian I. Enríquez‐Flores ◽  
Martha A. Palomino‐Ovando ◽  
...  
Keyword(s):  
Scanning Probe Microscopy ◽  
Scanning Probe ◽  
Probe Microscopy ◽  
Resonance Frequencies ◽  
Contact Resonance

Imaging molecules adsorbed onto electrodes under potential control by scanning probe microscopy

1991 ◽  
Vol 49 ◽  
pp. 376-377 ◽  
Author(s):  
N.J. Tao ◽  
J.A. DeRose ◽  
P.I. Oden ◽  
S.M. Lindsay
Keyword(s):  
Surface Charge ◽  
Environmental Effects ◽  
Scanning Probe Microscopy ◽  
Statistical Significance ◽  
Electrochemical Methods ◽  
Surface Structures ◽  
Scanning Probe ◽  
Potential Control ◽  
Afm Imaging ◽  
Special Circumstances

Clemmer and Beebe have pointed out that surface structures on graphite substrates can be misinterpreted as biopolymer images in STM experiments. We have been using electrochemical methods to react DNA fragments onto gold electrodes for STM and AFM imaging. The adsorbates produced in this way are only homogeneous in special circumstances. Searching an inhomogeneous substrate for ‘desired’ images limits the value of the data. Here, we report on a reversible method for imaging adsorbates. The molecules can be lifted onto and off the substrate during imaging. This leaves no doubt about the validity or statistical significance of the images. Furthermore, environmental effects (such as changes in electrolyte or surface charge) can be investigated easily.

The Role of Scanning Probe Microscopy in Drug Delivery Research

1996 ◽  
Vol 13 (3-4) ◽  
pp. 225-256 ◽  
Author(s):  
Kevin M. Shakesheff ◽  
Martyn C. Davies ◽  
Clive J. Roberts ◽  
Saul J. B. Tendler ◽  
Philip M. Williams
Keyword(s):  
Drug Delivery ◽  
Scanning Probe Microscopy ◽  
Scanning Probe ◽  
Probe Microscopy
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