Photothermal excitation of microcantilevers in liquids

@article{Ramos2006PhotothermalEO,
  title={Photothermal excitation of microcantilevers in liquids},
  author={Daniel Ramos and Javier Tamayo and Johann Mertens and Montserrat Calleja},
  journal={Journal of Applied Physics},
  year={2006},
  volume={99},
  pages={124904}
}
We report the selective excitation of the flexural modes of microcantilevers in aqueous solutions, by applying the photothermal excitation technique. The experiments show that a particular vibration mode can be efficiently excited by focusing the intensity-modulated laser beam on regions of high curvature of the vibration shape. In addition, the resulting resonant peaks in liquid appear distorted by an amplitude component that decreases with the frequency. This distortion produces a shift of… 

Figures from this paper

Photothermal excitation of microcantilevers in liquid: effect of the excitation laser position on temperature and vibrational amplitude

Demands to improve the sensitivity and measurement speed of dynamic scanning force microscopy and cantilever sensing applications necessitate the development of smaller cantilever sensors. As a

High efficiency laser photothermal excitation of microcantilever vibrations in air and liquids.

It is shown that by simply changing from a probe with a rectangular cross-section to one with a trapezoidal cross- section, the photothermal efficiency of an uncoated silicon cantilever can be increased by more than a order of magnitude, and the efficiency of a coated cantilevers can be increase by a factor of 2.

Continuously tuning the resonant characteristics of microcantilevers by a laser induced photothermal effect

Microcantilever sensors are ultrasensitive devices with miniaturized size and fast responding capability. However, they are generally designed to operate in a very narrow frequency range, which has

Photothermal excitation of a single-crystalline silicon cantilever for higher vibration modes in liquid

The authors analyze photothermal excitation of a single-crystalline silicon cantilever for higher vibration modes in liquid. The cantilever is bent by thermal stress generated by thermal diffusion in

Dynamics of photothermally driven VO2-coated microcantilevers

The dynamic response of VO2-coated silicon microcantilevers thermally driven over the film’s insulator-to-metal transition was studied using laser light pulses directly incident on the cantilevers.

Photothermal Study of Free and Forced Elastic Vibrations of Microcantilevers

Dynamic free (spontaneous) and forced (optically excited) elastic vibration spectra of a cantilever (CL) were studied. The amplitude and phase elastic displacements of silicon CLs were measured as a

Photothermal excitation and laser Doppler velocimetry of higher cantilever vibration modes for dynamic atomic force microscopy in liquid.

By reducing the tip oscillation amplitude using higher modes, the average tip-sample force gradient due to chemical bonds is effectively increased to achieve high-spatial-resolution imaging in liquid.

Photothermal Plasmonic Actuation of Micromechanical Cantilever Beams

Oscillations of charge carriers in plasmonic metal nanoparticles activated by resonant absorption of light are accompanied by local temperature increase due to nonradiative plasma damping. The

Shedding light on axial stress effect on resonance frequencies of nanocantilevers.

The results indicate that to achieve the ultimate detection limits with nanomechanical resonators one must consider the uncertainty due to the detection back-action, and the found phenomenology is intimately connected to the old unsolved problem about the effect of surface stress on the resonance frequency of singly clamped beams.
...

References

SHOWING 1-10 OF 36 REFERENCES

Optical excitation of nanoelectromechanical oscillators

We report a method of optical excitation of nanomechanical cantilever-type oscillators. The periodic driving signal with a controlled modulation amplitude was provided by a 415 nm diode laser,

Temperature and pressure dependence of resonance in multi-layer microcantilevers

The resonance frequency of the fundamental and four higher order modes of a silicon dioxide microcantilever is measured. The effect on these modes of depositing a 400 nm gold coating is investigated

Nonlinear dynamics of microcantilevers in tapping mode atomic force microscopy: A comparison between theory and experiment

The nonlinear dynamic response of atomic force microscopy cantilevers tapping on a sample is discussed through theoretical, computational, and experimental analysis. Experimental measurements are

Femtogram mass detection using photothermally actuated nanomechanical resonators

Nanomechanical devices with very small mass and size have the potential for mass sensing at the level of individual molecules. In the present study, we designed nanomechanical mass sensors,

Harmonic response of near‐contact scanning force microscopy

One‐dimensional harmonic oscillator theory was used to model tapping‐mode atomic force microscope (TMAFM) operation in the near‐contact region in the presence of gases and liquids. The force

A magnetically driven oscillating probe microscope for operation in liquids

Oscillating probe atomic force microscopy in fluids is simplified when an oscillating force is applied directly to a magnetized cantilever using a solenoid. The response of the detector is simpler

Studies of vibrating atomic force microscope cantilevers in liquid

An atomic force microscope (AFM) design providing a focused spot of order 7 μm in diameter was used to analyze the motion of vibrating cantilevers in liquid. Picking an operating frequency for

Ultrasensitive nanoelectromechanical mass detection

We describe the application of nanoelectromechanical systems (NEMS) to ultrasensitive mass detection. In these experiments, a modulated flux of atoms was adsorbed upon the surface of a 32.8 MHz NEMS