Direct measurement of the oscillation frequency in an optical-tweezers trap by parametric excitation.

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measuring viscoelastic properties of Red Blood Cell using optical tweezers

Efforts have been made to study the behavior of complex materials in micrometer dimensions with various techniques. One of these methods is the use of optical tweezers for biophysical applications. Red blood cells, as the most abundant blood-forming cells, play an important role in the life of living organisms, and their unique mechanical properties are important. In this report, the study of s...

Stabilization of Electrostatically Actuated Micro-pipe Conveying Fluid Using Parametric Excitation

This paper investigates the parametric excitation of a micro-pipe conveying fluid suspended between two symmetric electrodes. Electrostatically actuated micro-pipes may become unstable when the exciting voltage is greater than the pull-in value. It is demonstrated that the parametric excitation of a micro-pipe by periodic (ac) voltages may have a stabilizing effect and permit an increase of the...

Optical control of single neutral atoms

This thesis presents experiments concerning the preparation and manipulation of single neutral atoms in optical traps. The experimental setup as well as the properties of the optical dipole trap are described. The long term goal of this experiment is to use trapped atoms as information carriers in quantum information processing. The examination and control of all trapping parameters and heating...

Interlaced optical force-fluorescence measurements for single molecule biophysics.

Combining optical tweezers with single molecule fluorescence offers a powerful technique to study the biophysical properties of single proteins and molecules. However, such integration into a combined, coincident arrangement has been severely limited by the dramatic reduction in fluorescence longevity of common dyes under simultaneous exposure to trapping and fluorescence excitation beams. We p...