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Proceedings Article

Experimental characterisation of holographic optical traps for microbubbles

[+] Author Affiliations
Chris Fury, Caroline Harfield, Gianluca Memoli

National Physical Lab. (United Kingdom)

Philip H. Jones

Univ. College London (United Kingdom)

Eleanor Stride

Univ. of Oxford (United Kingdom)

Proc. SPIE 9126, Nanophotonics V, 91263L (May 2, 2014); doi:10.1117/12.2055889
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From Conference Volume 9126

  • Nanophotonics V
  • David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf
  • Brussels, Belgium | April 14, 2014

abstract

In this study microscopic gas bubbles (7-12 μm diameter) suspended in water were optically trapped in a custom-built microfluidic slide using holographically generated Laguerre-Gaussian (‘doughnut’) beam optical tweezers. The optical potential was then characterized as a function of bubble size, trapping laser power and trapping beam diameter (Laguerre-Gaussian beam mode) using the trap spring constant in the plane transverse to the beam propagation direction, obtained from the position fluctuations of the bubble in the trap measured by video microscopy and particle tracking. It was found that microbubbles were held at the equilibrium position of buoyant and optical forces at a distance from the focus of the beam that increased with laser power, and that optical trapping in this configuration was only possible within a specific range of trap and bubble parameters. Furthermore an optimum size of the doughnut beam to microbubble diameter which maximized the transverse spring constant was found . A ray optics model of the optical forces acting on microbubbles in a focused Laguerre-Gaussian beam was used in order to calculate the trap spring constants and equilibrium trapping position as a function of the different parameters, and highlight key physical behaviours. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Chris Fury ; Caroline Harfield ; Philip H. Jones ; Eleanor Stride and Gianluca Memoli
" Experimental characterisation of holographic optical traps for microbubbles ", Proc. SPIE 9126, Nanophotonics V, 91263L (May 2, 2014); doi:10.1117/12.2055889; http://dx.doi.org/10.1117/12.2055889


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