Effective sensor properties and sensitivity considerations of a dynamic co-resonantly coupled cantilever sensor

• Julia Körner

Beilstein J. Nanotechnol. 2018, 9, 2546–2560, doi:10.3762/bjnano.9.237

• Julia Korner University of Utah, 50 S. Central Campus Dr #2110, Salt Lake City, Utah, 84112, USA 10.3762/bjnano.9.237 Abstract Background: Co-resonant coupling of a micro- and a nanocantilever can be introduced to significantly enhance the sensitivity of dynamic-mode cantilever sensors while

• contribute towards extending and completing the already established theoretical basics of this novel co-resonant sensor concept and open up new ways of studying the coupled system’s behaviour. Keywords: cantilever sensor; co-resonant coupling; effective sensor properties; sensor sensitivity; Introduction

• using Equation 4 for each resonance peak based on the derived expressions for effective sensor properties. That furthermore allows to analyze the sensitivity gain induced by the co-resonant coupling in comparison to an individual cantilever sensor. For the exemplary values given in Table 1, the minimal

Signal enhancement in cantilever magnetometry based on a co-resonantly coupled sensor

• Julia Körner,
• Christopher F. Reiche,
• Thomas Gemming,
• Bernd Büchner,
• Gerald Gerlach and
• Thomas Mühl

Beilstein J. Nanotechnol. 2016, 7, 1033–1043, doi:10.3762/bjnano.7.96

• technique. Ultrathin and slender cantilevers can address this challenge but lead to increased complexity of detection. We present an approach based on the co-resonant coupling of a micro- and a nanometer-sized cantilever. Via matching of the resonance frequencies of the two subsystems we induce a strong

• signal even with very small magnetic samples. On the other hand, detection becomes increasingly difficult when the size of the cantilever is reduced to dimensions on the nanoscale. Our recently introduced sensor concept addresses these difficulties by co-resonant coupling of a micro- and a nanocantilever

• the co-resonant coupling this changes the resonance frequencies of the coupled system and can be detected at the cantilever. Small interactions result in rather large frequency shifts due to the low stiffness, i.e., high sensitivity of the nanoscale oscillator, and can be measured with a rather