scholarly journals Multipoint viscosity measurements in microfluidic channels using optical tweezers

Lab on a Chip ◽  
2009 ◽  
Vol 9 (14) ◽  
pp. 2059 ◽  
Author(s):  
Stephen Keen ◽  
Alison Yao ◽  
Jonathan Leach ◽  
Roberto Di Leonardo ◽  
Chris Saunter ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Microfluidic Channels ◽  
Viscosity Measurements

Optical Manipulation of Inorganic and Organic Objects in Soft Microfluidic Devices

2000 ◽  
Vol 657 ◽  
Author(s):  
Cengiz S. Ozkan ◽  
Erhan Ata ◽  
Mihrimah Ozkan ◽  
Sadik C. Esener
Keyword(s):  
Optical Tweezers ◽  
Cell Sorting ◽  
Cell Biology ◽  
Microfluidic Devices ◽  
Optical Manipulation ◽  
Microfluidic Channels ◽  
Negative Photoresist ◽  
Pdms Elastomer ◽  
Biology Research ◽  
Inorganic And Organic

ABSTRACTWe describe a technique for trapping and manipulation of inorganic and organic objects in microfluidic channels, based on photonic momentum transfer using an optical tweezers arrangement. Microfluidic devices have been fabricated by polydimethylsiloxane (PDMS) elastomer molding of patterns lithographically defined on a thick negative photoresist. Polystyrene microspheres dispersed in water were transferred into the fluidic channels using a syringe pump. Microspheres and live biological cells are trapped and redirected by optical manipulation within the fluidic channels. Optical trapping and patterning will have applications in creation of active cellular arrays for cell biology research, tissue engineering, cell sorting and drug discovery.

scholarly journals Micro-Dumbbells—A Versatile Tool for Optical Tweezers

2018 ◽  
Author(s):  
Weronika Lamperska ◽  
Sławomir Drobczyński ◽  
Michał Nawrot ◽  
Piotr Wasylczyk ◽  
Jan Masajada
Keyword(s):  
Laser Beam ◽  
Optical Tweezers ◽  
Optical Trapping ◽  
Viscosity Measurements ◽  
Two Photon ◽  
Vibration Detection ◽  
Holographic Optical Tweezers ◽  
Versatile Tool ◽  
Micro Tool

Manipulation of micro- and nano-sized objects with optical tweezers is a well established, albeit still evolving technique. While many objects can be trapped directly with focused laser beam(s), for some applications indirect manipulation with tweezers-operated tools is preferred. We introduce a simple, versatile micro-tool operated with holographic optical tweezers. The 40 µm long dumbbell-shaped tool, fabricated with two-photon laser 3D photolithography has two beads for efficient optical trapping and a probing spike on one end. We demonstrate fluids viscosity measurements and vibration detection as examples of possible applications.

Viscosity measurements on micron-size scale using optical tweezers

2005 ◽  
Vol 76 (11) ◽  
pp. 115105 ◽  
Author(s):  
G. Pesce ◽  
A. Sasso ◽  
S. Fusco
Keyword(s):  
Optical Tweezers ◽  
Size Scale ◽  
Viscosity Measurements ◽  
Micron Size

scholarly journals Optical Assembling of Micro-Particles at a Glass–Water Interface with Diffraction Patterns Caused by the Limited Aperture of Objective

2018 ◽  
Vol 8 (9) ◽  
pp. 1522 ◽  
Author(s):  
Min-Cheng Zhong ◽  
Ai-Yin Liu ◽  
Rong Zhu
Keyword(s):  
Optical Tweezers ◽  
Bottom Surface ◽  
Microfluidic Channels ◽  
Compact Structure ◽  
Particle Distributions ◽  
Micro Particles ◽  
Polarized Beam ◽  
Linearly Polarized ◽  
Ring Structures ◽  
Diffraction Patterns

Optical tweezers can manipulate micro-particles, which have been widely used in various applications. Here, we experimentally demonstrate that optical tweezers can assemble the micro-particles to form stable structures at the glass–solution interface in this paper. Firstly, the particles are driven by the optical forces originated from the diffraction fringes, which of the trapping beam passing through an objective with limited aperture. The particles form stable ring structures when the trapping beam is a linearly polarized beam. The particle distributions in the transverse plane are affected by the particle size and concentration. Secondly, the particles form an incompact structure as two fan-shaped after the azimuthally polarized beam passing through a linear polarizer. Furthermore, the particles form a compact structure when a radially polarized beam is used for trapping. Thirdly, the particle patterns can be printed steady at the glass surface in the salt solution. At last, the disadvantage of diffraction traps is discussed in application of optical tweezers. The aggregation of particles at the interfaces seriously affects the flowing of particles in microfluidic channels, and a total reflector as the bottom surface of sample cell can avoid the optical tweezers induced particle patterns at the interface. The optical trapping study utilizing the diffraction gives an interesting method for binding and assembling microparticles, which is helpful to understand the principle of optical tweezers.

Application of vertical-cavity laser-based optical tweezers for particle manipulation in microfluidic channels

2008 ◽  
Author(s):  
Andrea Kroner ◽  
Carolin Schneck ◽  
Fernando Rinaldi ◽  
Rudolf Rösch ◽  
Rainer Michalzik
Keyword(s):  
Optical Tweezers ◽  
Microfluidic Channels ◽  
Particle Manipulation ◽  
Cavity Laser ◽  
Vertical Cavity

Defining the trapping limits of holographical optical tweezers

2004 ◽  
Vol 51 (3) ◽  
pp. 409-414 ◽  
Author(s):  
P. Jordan ◽  
J. Leach ◽  
M. J. Padgett ◽  
J. Cooper ◽  
G. Sinclair
Keyword(s):  
Optical Tweezers

JOULE HEATING INDUCED HEAT TRANSFER IN ELECTROKINETIC FLOW THROUGH MICROFLUIDIC CHANNELS

Equipment ◽  
2006 ◽  
Author(s):  
C. Yang ◽  
G. Y. Tang ◽  
D. G. Yan ◽  
H. Q. Gong ◽  
John C. Chai ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Joule Heating ◽  
Microfluidic Channels ◽  
Electrokinetic Flow ◽  
Flow Through
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