Rotating Optical Tweezers

Singer, W., Nieminen, T. A., Gibson, Ursula J., Heckenberg, N. R. and Rubinsztein-Dunlop, H. (2005). Rotating Optical Tweezers. In: David L. Andrews, Proceedings of SPIE. SPIE The International Society for Optical Engineering, San Jose California USA, (16-24). 25-26 January, 2005.

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Author Singer, W.
Nieminen, T. A.
Gibson, Ursula J.
Heckenberg, N. R.
Rubinsztein-Dunlop, H.
Title of paper Rotating Optical Tweezers
Conference Paper Type Fully Published Paper
Conference name SPIE The International Society for Optical Engineering
Conference location San Jose California USA
Conference dates 25-26 January, 2005
Proceedings title Proceedings of SPIE
Journal name Nanomanipulation with Light
Editor David L. Andrews
Place published Bellingham USA
Publisher SPIE International Society of Optical Engineering
Publication date 2005
Volume number 5736
ISSN 0277-786X
Start page 16
End page 24
Total pages 9
Collection year 2005
Language eng
Abstract/Summary Several methods to rotate and align microscopic particles controllably have been developed. Control of the orientation of a trapped particle allows full three dimensional manipulation, whereas rotating particles are tools for the development of optically-driven micromachines. It has been shown that the orientation of an object in the laser trap depends on its birefringence as well as on its shape. The effect of shape is often referred to as form-birefringence. We report on the trapping, rotation, and in-situ growth of birefringent tetragonal lysozyme crystals in optical tweezers operating at a wavelength of 1064 nm. Variation of the temperature, pH and lysozyme concentration of the solution during growth was used to alter the size, as well as the length to width ratio of the crystals, and hence their orientation in the tweezers. Thus this system serves as a model to study the relative importance of birefringence versus form-birefringence for particle orientation. Crystals with the optical axis skewed or perpendicular to the trapping-beam axis could be rotated by changing the orientation of linearly polarized light. We observed spontaneous spinning of some asymmetric crystals in the presence of linearly polarized light, due to radiation pressure effects. Addition of protein to the solution in the tweezers permitted real-time observation of crystal growth.
Subjects 240504 Electrostatics and Electrodynamics
240400 Optical Physics
E1
780102 Physical sciences
240499 Optical Physics not elsewhere classified
Keyword optical tweezers
optical rotation
optical angular momentum
lysozyme
Q-Index Code E1
 
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Created: Thu, 05 May 2005, 10:00:00 EST by Timo Nieminen on behalf of School of Mathematics & Physics  -  Detailed History