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Title: Electrostatically actuated encased cantilevers

Abstract

Background: Encased cantilevers are novel force sensors that overcome major limitations of liquid scanning probe microscopy. By trapping air inside an encasement around the cantilever, they provide low damping and maintain high resonance frequencies for exquisitely low tip-sample interaction forces even when immersed in a viscous fluid. Quantitative measurements of stiffness, energy dissipation and tip-sample interactions using dynamic force sensors remain challenging due to spurious resonances of the system. Results: We demonstrate for the first time electrostatic actuation with a built-in electrode. Solely actuating the cantilever results in a frequency response free of spurious peaks. We analyze static, harmonic, and sub-harmonic actuation modes. Sub-harmonic mode results in stable amplitudes unaffected by potential offsets or fluctuations of the electrical surface potential. Here in this paper, we present a simple plate capacitor model to describe the electrostatic actuation. The predicted deflection and amplitudes match experimental results within a few percent. Consequently, target amplitudes can be set by the drive voltage without requiring calibration of optical lever sensitivity. Furthermore, the excitation bandwidth outperforms most other excitation methods. Conclusion: Compatible with any instrument using optical beam deflection detection electrostatic actuation in encased cantilevers combines ultra-low force noise with clean and stable excitation well-suited formore » quantitative measurements in liquid, compatible with air, or vacuum environments.« less

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry; Scuba Probe Technologies LLC, Alameda, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Scuba Probe Technologies LLC, Almeda, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1460304
Alternate Identifier(s):
OSTI ID: 1460613
Grant/Contract Number:  
AC02-05CH11231; SC0013212
Resource Type:
Accepted Manuscript
Journal Name:
Beilstein Journal of Nanotechnology
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2190-4286
Publisher:
Beilstein Institute
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 47 OTHER INSTRUMENTATION; amplitude calibration; atomic force microscopy; electrostatic excitation; encased cantilevers; liquid AFM; 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Desbiolles, Benoit X. E., Furlan, Gabriela, Schwartzberg, Adam M., Ashby, Paul D., and Ziegler, Dominik. Electrostatically actuated encased cantilevers. United States: N. p., 2018. Web. doi:10.3762/bjnano.9.130.
Desbiolles, Benoit X. E., Furlan, Gabriela, Schwartzberg, Adam M., Ashby, Paul D., & Ziegler, Dominik. Electrostatically actuated encased cantilevers. United States. doi:10.3762/bjnano.9.130.
Desbiolles, Benoit X. E., Furlan, Gabriela, Schwartzberg, Adam M., Ashby, Paul D., and Ziegler, Dominik. Tue . "Electrostatically actuated encased cantilevers". United States. doi:10.3762/bjnano.9.130. https://www.osti.gov/servlets/purl/1460304.
@article{osti_1460304,
title = {Electrostatically actuated encased cantilevers},
author = {Desbiolles, Benoit X. E. and Furlan, Gabriela and Schwartzberg, Adam M. and Ashby, Paul D. and Ziegler, Dominik},
abstractNote = {Background: Encased cantilevers are novel force sensors that overcome major limitations of liquid scanning probe microscopy. By trapping air inside an encasement around the cantilever, they provide low damping and maintain high resonance frequencies for exquisitely low tip-sample interaction forces even when immersed in a viscous fluid. Quantitative measurements of stiffness, energy dissipation and tip-sample interactions using dynamic force sensors remain challenging due to spurious resonances of the system. Results: We demonstrate for the first time electrostatic actuation with a built-in electrode. Solely actuating the cantilever results in a frequency response free of spurious peaks. We analyze static, harmonic, and sub-harmonic actuation modes. Sub-harmonic mode results in stable amplitudes unaffected by potential offsets or fluctuations of the electrical surface potential. Here in this paper, we present a simple plate capacitor model to describe the electrostatic actuation. The predicted deflection and amplitudes match experimental results within a few percent. Consequently, target amplitudes can be set by the drive voltage without requiring calibration of optical lever sensitivity. Furthermore, the excitation bandwidth outperforms most other excitation methods. Conclusion: Compatible with any instrument using optical beam deflection detection electrostatic actuation in encased cantilevers combines ultra-low force noise with clean and stable excitation well-suited for quantitative measurements in liquid, compatible with air, or vacuum environments.},
doi = {10.3762/bjnano.9.130},
journal = {Beilstein Journal of Nanotechnology},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {5}
}

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