, Volume 65, Issue 5, pp 777–786 | Cite as

Optically-driven red blood cell rotor in linearly polarized laser tweezers

  • Manas Khan
  • Samarendra K. Mohanty
  • A. K. Sood


We have constructed a dual trap optical tweezers set-up around an inverted microscope where both the traps can be independently controlled and manipulated in all the three dimensions. Here we report our observations on rotation of red blood cells (RBCs) in a linearly polarized optical trap. Red blood cells deform and become twisted in hypertonic phosphate buffer saline and when trapped, experience an unbalanced radiation pressure force. The torque generated from the unbalanced force causes the trapped RBC to rotate. Addition of Ca++ ions in the solution, keeping the osmolarity same, makes the cell membranes stiffer and the cells deform less. Thus the speed of rotation of the red blood cells can be controlled, as less deformation and in turn less asymmetry in shape produces less torque under the radiation pressure resulting in slower rotation at the same laser power


Rotation of red blood cell optical tweezers dual optical trap 


87.80.Cc 87.83.+a 87.80.Fe 89.20.-a 


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Copyright information

© Indian Academy of Sciences 2005

Authors and Affiliations

  • Manas Khan
    • 1
  • Samarendra K. Mohanty
    • 1
  • A. K. Sood
    • 1
    • 2
  1. 1.Department of PhysicsIndian Institute of ScienceBangaloreIndia
  2. 2.Unit on Nanoscience and Technology-DSTIndian Institute of ScienceBangaloreIndia

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