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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 4645–4652

Optical trapping in an absorbing medium: from optical tweezing to thermal tweezing

Poonam Kumari, J. A. Dharmadhikari, A. K. Dharmadhikari, H. Basu, S. Sharma, and D. Mathur  »View Author Affiliations


Optics Express, Vol. 20, Issue 4, pp. 4645-4652 (2012)
http://dx.doi.org/10.1364/OE.20.004645


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Abstract

We report on optical trapping in a weakly absorbing medium, hemin, an iron-containing porphyrin that is an important component of hemoglobin. By altering the hemin concentration we are able to control the amount of optical energy that is absorbed; changing the hemin concentration from <12 mg/ml to >45 mg/ml enables the onset of thermal trapping to be observed. By estimating the trap strength using two different methods we are readily able to differentiate between the optical trapping and thermal trapping regimes. We also deduce the rise in temperature that occurs within the laser focal volume: temperature changes of 5-24 K are observed for laser power values of 10-90 mW for hemin concentrations of 0-50 mg/ml.

© 2012 OSA

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(140.7010) Lasers and laser optics : Laser trapping
(350.5340) Other areas of optics : Photothermal effects
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: December 7, 2011
Revised Manuscript: February 3, 2012
Manuscript Accepted: February 3, 2012
Published: February 9, 2012

Virtual Issues
Vol. 7, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Poonam Kumari, J. A. Dharmadhikari, A. K. Dharmadhikari, H. Basu, S. Sharma, and D. Mathur, "Optical trapping in an absorbing medium: from optical tweezing to thermal tweezing," Opt. Express 20, 4645-4652 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-4-4645


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