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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 4, Iss. 8 — Aug. 1, 2013
  • pp: 1442–1450

Micro-ultrasonic cleaving of cell clusters by laser-generated focused ultrasound and its mechanisms

Hyoung Won Baac, Taehwa Lee, and L. Jay Guo  »View Author Affiliations


Biomedical Optics Express, Vol. 4, Issue 8, pp. 1442-1450 (2013)
http://dx.doi.org/10.1364/BOE.4.001442


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Abstract

Laser-generated focused ultrasound (LGFU) is a unique modality that can produce single-pulsed cavitation and strong local disturbances on a tight focal spot (<100 μm). We utilize LGFU as a non-contact, non-thermal, high-precision tool to fractionate and cleave cell clusters cultured on glass substrates. Fractionation processes are investigated in detail, which confirms distinct cell behaviors in the focal center and the periphery of LGFU spot. For better understanding of local disturbances under LGFU, we use a high-speed laser-flash shadowgraphy technique and then fully visualize instantaneous microscopic processes from the ultrasound wave focusing to the micro-bubble collapse. Based on these visual evidences, we discuss possible mechanisms responsible for the focal and peripheral disruptions, such as a liquid jet-induced wall shear stress and shock emissions due to bubble collapse. The ultrasonic micro-fractionation is readily available for in vitro cell patterning and harvesting. Moreover, it is significant as a preliminary step towards high-precision surgery applications in future.

© 2013 OSA

OCIS Codes
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.7170) Medical optics and biotechnology : Ultrasound

ToC Category:
Cell Studies

History
Original Manuscript: March 25, 2013
Revised Manuscript: July 3, 2013
Manuscript Accepted: July 10, 2013
Published: July 26, 2013

Citation
Hyoung Won Baac, Taehwa Lee, and L. Jay Guo, "Micro-ultrasonic cleaving of cell clusters by laser-generated focused ultrasound and its mechanisms," Biomed. Opt. Express 4, 1442-1450 (2013)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-4-8-1442


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