Dr Andrew E. Ekpenyong

Associate Professor of Physics. BPhil (Rome), BD (Rome), MS (Physics, Creighton, USA), PhD (Physics, Cambridge, UK)



Contact

Dr Andrew Edet Ekpenyong

Associate Professor of Physics


Curriculum vitae



Office Phone: +14022802208


Physics

Creighton University

2500 California Plaza,
Omaha,
NE 68178,
USA




Dr Andrew E. Ekpenyong

Associate Professor of Physics. BPhil (Rome), BD (Rome), MS (Physics, Creighton, USA), PhD (Physics, Cambridge, UK)



Office Phone: +14022802208


Physics

Creighton University

2500 California Plaza,
Omaha,
NE 68178,
USA



Dual-beam laser traps in biology and medicine: when one beam is not enough


Journal article


G. Whyte, F. Lautenschläger, M. Kreysing, Lars Boyde, Andrew E. Ekpenyong, U. Delabre, K. Chalut, K. Franze, J. Guck
NanoScience + Engineering, 2010

Semantic Scholar DOI
Cite

Cite

APA   Click to copy
Whyte, G., Lautenschläger, F., Kreysing, M., Boyde, L., Ekpenyong, A. E., Delabre, U., … Guck, J. (2010). Dual-beam laser traps in biology and medicine: when one beam is not enough. NanoScience + Engineering.


Chicago/Turabian   Click to copy
Whyte, G., F. Lautenschläger, M. Kreysing, Lars Boyde, Andrew E. Ekpenyong, U. Delabre, K. Chalut, K. Franze, and J. Guck. “Dual-Beam Laser Traps in Biology and Medicine: When One Beam Is Not Enough.” NanoScience + Engineering (2010).


MLA   Click to copy
Whyte, G., et al. “Dual-Beam Laser Traps in Biology and Medicine: When One Beam Is Not Enough.” NanoScience + Engineering, 2010.


BibTeX   Click to copy

@article{g2010a,
  title = {Dual-beam laser traps in biology and medicine: when one beam is not enough},
  year = {2010},
  journal = {NanoScience + Engineering},
  author = {Whyte, G. and Lautenschläger, F. and Kreysing, M. and Boyde, Lars and Ekpenyong, Andrew E. and Delabre, U. and Chalut, K. and Franze, K. and Guck, J.}
}

Abstract

Optical traps are nowadays quite ubiquitous in biophysical and biological studies. The term is often used synonymously with optical tweezers, one particular incarnation of optical traps. However, there is another kind of optical trap consisting of two non-focused, counter-propagating laser beams. This dual-beam trap predates optical tweezers by almost two decades and currently experiences a renaissance. The advantages of dual-beam traps include lower intensities on the trapped object, decoupling from imaging optics, and the possibility to trap cells and cell clusters up to 100 microns in diameter. When used for deforming cells this trap is referred to as an optical stretcher. I will review several applications of such traps in biology and medicine for the detection of cancer cells, sorting stem cells, testing light guiding properties of retinal cells and the controlled rotation of cells for single cell tomography.


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