Latest Optical tweezers Stories

Cell Analysis Possible Thanks To Biochip-based Device
2012-05-30 11:04:44

Inexpensive, portable devices that can rapidly screen cells for leukemia or HIV may soon be possible thanks to a chip that can produce three-dimensional focusing of a stream of cells, according to researchers. "HIV is diagnosed based on counting CD4 cells," said Tony Jun Huang, associate professor of engineering science and mechanics, Penn State. "Ninety percent of the diagnoses are done using flow cytometry." Huang and his colleagues designed a mass-producible device that can focus...

2012-02-17 10:22:16

Researchers from the University of York are pioneering the development of electron microscopes which will allow scientists to examine a greater variety of materials in new revolutionary ways. The team, headed by Professor Jun Yuan and Professor Mohamed Babiker, from the University´s Department of Physics has created electron beams with orbital angular momentum — electron vortex beams — which will open the way to many novel applications including the more efficient...

2012-01-12 21:31:48

University of Illinois researchers have shown that by tuning the properties of laser light illuminating arrays of metal nanoantennas, these nano-scale structures allow for dexterous optical tweezing as well as size-sorting of particles. "Nanoantennas are extremely popular right now because they are really good at concentrating optical fields in small areas,” explained Kimani Toussaint, Jr., an assistant professor of mechanical science and engineering at the University of Illinois at...

2011-11-09 22:36:30

Not to pick up electrons, but tweezers made of electrons. A recent paper by researchers from the National Institute of Standards and Technology (NIST) and the University of Virginia (UVA) demonstrates that the beams produced by modern electron microscopes can be used not just to look at nanoscale objects, but to move them around, position them and perhaps even assemble them. Essentially, they say, the tool is an electron version of the laser "optical tweezers" that have become a standard...

Image 1 - NASA Studying Ways To Make 'Tractor Beams' A Reality
2011-11-02 03:30:51

[ Watch the Video ] Tractor beams -- the ability to trap and move objects using laser light -- are the stuff of science fiction, but a team of NASA scientists has won funding to study the concept for remotely capturing planetary or atmospheric particles and delivering them to a robotic rover or orbiting spacecraft for analysis. The NASA Office of the Chief Technologist (OCT) has awarded Principal Investigator Paul Stysley and team members Demetrios Poulios and Barry Coyle at NASA's...

2011-10-12 13:22:32

U.S. Naval Research Laboratory researchers Dr. Sean J. Hart, Dr. Colin G. Hebert and Mr. Alex Terray have developed a laser-based analysis method that can detect optical pressure differences between populations or classes of blood cells that does not rely on prior knowledge, antibodies, or fluorescent labels for discrimination. "Biological analysis systems that rely on labels can be costly, labor intensive and depend upon prior knowledge of the target in question," says Dr. Hart, NRL...

Image 1 - Plasmonic Optical Tweezers Trap Tightly Without Overheating
2011-09-26 09:58:58

   Improved device eliminates a barrier to handling nanoscale particles Engineers at Harvard have created a device that may make it easier to isolate and study tiny particles such as viruses. Their plasmonic nanotweezers, revealed this month in Nature Communications, use light from a laser to trap nanoscale particles. The new device creates strong forces more efficiently than traditional optical tweezers and eliminates a problem that caused earlier setups to overheat....

2011-05-24 06:21:46

Sequencing DNA base pairs "“ the individual molecules that make up DNA "“ is key for medical researchers working toward personalized medicine. Being able to isolate, study and sequence these DNA molecules would allow scientists to tailor diagnostic testing, therapies and treatments based on each patient's individual genetic makeup. But being able to isolate individual molecules like DNA base pairs, which are just two nanometers across "“ or about 1/50,000th the diameter of a...

2011-03-03 09:12:30

Liz Ahlberg, University of Illinois Illinois researchers have combined two molecular imaging technologies to create an instrument with incredible sensitivity that provides new, detailed insight into dynamic molecular processes. Physics professors Taekjip Ha and Yann Chemla and combined their expertise in single-molecule biophysics "“ fluorescence microscopy and optical traps, respectively "“ to study binding and unbinding of individual DNA segments to a larger strand. They and...

2011-03-03 08:55:12

The tractor beam -- a tool popularized in the realm of science fiction -- has been slowly making its way into the realm of reality, where beams of light are used to pull objects back toward the source of the light, BBC News reports. In a paper published online, researchers from Hong Kong and China have analyzed and calculated the conditions required to create a tractor beam, or in reality, a laser-based "pull." Unlike the ones popularized in science fiction -- most notably Star Trek -- the...

Word of the Day
  • Remarkable; prodigious.
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This word is probably from the dialectal 'boldacious,' a blend of 'bold' and 'audacious.'