Shear force interaction in the viscous damping regime studied at 100 pN force resolution

Schmidt, Jochen; Bergander, H.; Eng, Lukas M.

doi:10.1063/1.372306

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…To avoid the perturbation caused by water vibration and any other instability, acquisition at each point was repeated 35 times and the values obtained then averaged. The set point for the engaged tip oscillation amplitude was chosen at about 96% of the maximum so that the SNOM could operate in non‐contact mode (Schmidt et al ., 2000).…”

Section: Resultsmentioning

confidence: 99%

Shear force near‐field optical microscope based on Q‐controlled bimorph sensor for biological imaging in liquid

Lei

Angiboust

Qiao

et al. 2004

Journal of Microscopy

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Key words. Biological imaging in liquid, Q -enhancement, scanning near-field optical microscopy (SNOM), sensitivity improvement, shear force detection. SummaryShear force near-field microscopy on biological samples in their physiological environment loses considerable sensitivity and resolution as a result of liquid viscous damping. Using a bimorph-based cantilever sensor incorporating force feedback, as recently developed by us, gives an alternative force detection scheme for biological imaging in liquid. The dynamics and sensitivity of this sensor were theoretically and experimentally discussed. Driving the bimorph cantilever close to its resonance frequency with appropriate force feedback allows us to obtain a quality factor ( Q -factor) of up to 10 3 in water, without changing its intrinsic resonance frequency and spring constant. Thus, the force detection sensitivity is improved. Shear force imaging on mouse brain sections and human skin tissues in liquid with an enhanced Q -factor of 410 have shown a high sensitivity and stability. A resolution of about 50 nm has been obtained. The experimental results suggest that the system is reliable and particularly suitable for biological cell imaging in a liquid environment.

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Section: Resultsmentioning

confidence: 99%

Shear force near‐field optical microscope based on Q‐controlled bimorph sensor for biological imaging in liquid

Lei

Angiboust

Qiao

et al. 2004

Journal of Microscopy

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“…Changes in amplitude and/or phase of the oscillation are used as a feedback signal to control the probe-sample distance for shear force imaging. The detection of the changes is generally realised by attaching the probe to a mechanical oscillator, such as a tuning fork (Karrai & Grober, 1995;Schmidt et al, 2000), piezoelectric tube (Hsu et al, 1995;Lee et al, 1996) and bimorph (Shang et al, 2004;Shang et al, 2005;Lei et al, 2006), forming a shear force sensor. By contrast with the optical detection of cantilever deflection in SFM, remarkable advantage of such shear force sensors is their self-sensing principle of operation, which dispenses with the need for laser deflection or external excitation, and readily enables the integration of ShFM system into SEMs (Bercu et al, 2016) and scanning electrochemical microscopy (Etienne et al, 2016) .…”

Section: Introductionmentioning

confidence: 99%

Direct manipulation of metallic nanosheets by shear force microscopy

Cai

Wang

et al. 2018

Journal of Microscopy

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Micro/nanomanipulation is a rapidly growing technology and holds promising applications in various fields, including photonic/electronic devices, chemical/biosensors etc. In this work, we present that shear force microscopy (ShFM) can be exploited to manipulate metallic nanosheets besides imaging. The manipulation is realized via controlling the shear force sensor probe position and shear force magnitude based on our homemade ShFM system under an optical microscopy for in situ observation. The main feature of the ShFM system is usage of a piezoelectric bimorph sensor, which has the ability of self-excitation and detection. Moreover, the shear force magnitude as a function of the spring constant of the sensor and setpoint is obtained, which indicates that operation modes can be switched between imaging and manipulation through designing the spring constant before experiment and changing the setpoint during manipulation process, respectively. We believe that this alternative manipulation technique could be used to assemble other nanostructures with different shapes, sizes and compositions for new properties and wider applications.

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“…In previous studies, researchers adopted the single degree of freedom vibration theory or the Euler–Bernoulli beam theory to analyze the dynamic behavior of the TF-probe [ 17 , 22 , 23 ], and concluded that the shear force mechanism was induced by the lateral interaction between the probe and the sample. Meanwhile, various experiments have also been implemented to investigate the shear force mechanism of the TF-probe.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, some numerical methods have also been employed to analyze the dynamic performance of the TF-probe. For example, Schmidt et al [ 22 ] initiated a finite element method (FEM) to model a complete TF setup and estimated the damping force between a fiber apex and the hydrophilic samples. Additionally, Lee et al [ 36 ] analyzed the resonance frequency of quartz TF crystal with FEM and fabricated a TF using photolithography.…”

Section: Introductionmentioning

confidence: 99%

Research on the Sensing Performance of the Tuning Fork-Probe as a Micro Interaction Sensor

Gao

2015

Sensors

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The shear force position system has been widely used in scanning near-field optical microscopy (SNOM) and recently extended into the force sensing area. The dynamic properties of a tuning fork (TF), the core component of this system, directly determine the sensing performance of the shear positioning system. Here, we combine experimental results and finite element method (FEM) analysis to investigate the dynamic behavior of the TF probe assembled structure (TF-probe). Results from experiments under varying atmospheric pressures illustrate that the oscillation amplitude of the TF-probe is linearly related to the quality factor, suggesting that decreasing the pressure will dramatically increase the quality factor. The results from FEM analysis reveal the influences of various parameters on the resonant performance of the TF-probe. We compared numerical results of the frequency spectrum with the experimental data collected by our recently developed laser Doppler vibrometer system. Then, we investigated the parameters affecting spatial resolution of the SNOM and the dynamic response of the TF-probe under longitudinal and transverse interactions. It is found that the interactions in transverse direction is much more sensitive than that in the longitudinal direction. Finally, the TF-probe was used to measure the friction coefficient of a silica–silica interface.

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Shear force interaction in the viscous damping regime studied at 100 pN force resolution

Abstract: A novel digital feedback scheme of shear-force control in near-field scanning optical microscopy Rev.

Cited by 19 publications

References 16 publications

Shear force near‐field optical microscope based on Q‐controlled bimorph sensor for biological imaging in liquid

Shear force near‐field optical microscope based on Q‐controlled bimorph sensor for biological imaging in liquid

Direct manipulation of metallic nanosheets by shear force microscopy

Research on the Sensing Performance of the Tuning Fork-Probe as a Micro Interaction Sensor

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