APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

12 Mar 2001

Volume 78, Issue 11, pp. 1463-1639

Return to All Sections
back to top
RSS Feeds

Actuation and characterization of atomic force microscope cantilevers in fluids by acoustic radiation pressure

F. L. Degertekin, B. Hadimioglu, T. Sulchek, and C. F. Quate

Appl. Phys. Lett. 78, 1628 (2001); http://dx.doi.org/10.1063/1.1354157 (3 pages) | Cited 20 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An actuation method for atomic force microscope (AFM) cantilevers in fluids is reported. The radiation pressure generated by a focused acoustic transducer at radio frequency (rf) (100–300 MHz) exerts a localized force of controlled amplitude at a desired location on the AFM cantilever. This force can be used to measure the spring constant and other dynamic properties of the cantilever. Furthermore, by amplitude modulating the rf signal input to the acoustic transducer, the cantilever is actuated in the dc–MHz frequency range. This provides a broadband actuation and characterization method for AFM cantilevers with arbitrary geometry. The technique is demonstrated on AFM cantilevers with spring constants in the 0.01–10 N/m range using a micromachined acoustic transducer/Fresnel lens structure operating at 179 MHz in water. © 2001 American Institute of Physics.
Show PACS
07.79.Lh Atomic force microscopes
07.10.Cm Micromechanical devices and systems
43.30.Yj Transducers and transducer arrays for underwater sound; transducer calibration
43.25.Qp Radiation pressure
43.38.Pf Hydroacoustic and hydraulic transducers

Laser ablation of bicomponent systems: A probe of molecular ejection mechanisms

Yaroslava G. Yingling, Leonid V. Zhigilei, Barbara J. Garrison, Antonis Koubenakis, John Labrakis, and Savas Georgiou

Appl. Phys. Lett. 78, 1631 (2001); http://dx.doi.org/10.1063/1.1353816 (3 pages) | Cited 16 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A combined experimental and molecular dynamics simulation study of laser ablation of a model bicomponent system with solutes of different volatility provides a consistent picture of the mechanisms of material ejection. The comparison of the ejection yields shows that there are two distinct regimes of molecular ejection, desorption at low laser fluences, and a collective ejection of a volume of material or ablation at higher fluences. Ejection of volatile solutes dominates in the desorption regime, whereas nonvolatile solutes are ejected only in the ablation regime. © 2001 American Institute of Physics.
Show PACS
79.20.Ds Laser-beam impact phenomena
68.43.Tj Photon stimulated desorption
68.43.Hn Structure of assemblies of adsorbates (two- and three-dimensional clustering)
79.20.La Photon- and electron-stimulated desorption

High-frequency eddy-current technique for thickness measurement of micron-thick conducting layers

F. Sakran, M. Golosovsky, H. Goldberger, D. Davidov, and A. Frenkel

Appl. Phys. Lett. 78, 1634 (2001); http://dx.doi.org/10.1063/1.1355298 (3 pages) | Cited 1 time

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate a reflection-mode eddy-current technique operating in the 100 MHz to 5 GHz range. It allows contactless measurement of the thickness of conducting layers (Ag, Al, Cu, W, etc.) 0.1–1 μm thick with the spatial resolution of 1–2 mm. © 2001 American Institute of Physics.
Show PACS
06.30.Bp Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)
85.40.Ls Metallization, contacts, interconnects; device isolation
81.70.Ex Nondestructive testing: electromagnetic testing, eddy-current testing

Manipulation and controlled amplification of Brownian motion of microcantilever sensors

Adosh Mehta, Suman Cherian, David Hedden, and Thomas Thundat

Appl. Phys. Lett. 78, 1637 (2001); http://dx.doi.org/10.1063/1.1355001 (3 pages) | Cited 36 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Microcantilevers, such as those used in atomic force microscopy, undergo Brownian motion due to mechanical thermal noise. The root mean square amplitude of the Brownian motion of a cantilever typically ranges from 0.01–0.1 nm, which limits its use in practical applications. Here we describe a technique by which the Brownian amplitude and the Q factor in air and water can be amplified by three and two orders of magnitude, respectively. This technique is similar to a positive feedback oscillator, wherein the Brownian motion of the vibrating cantilever controls the frequency output of the oscillator. This technique can be exploited to improve sensitivity of microcantilever-based chemical and biological sensors, especially for sensors in liquid environments. © 2001 American Institute of Physics.
Show PACS
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.10.Cm Micromechanical devices and systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.79.Lh Atomic force microscopes
47.85.Np Fluidics
87.85.Va Micromachining
05.40.Jc Brownian motion
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close