Tiny whispering gallery: Sensor can detect a single nanoparticle and take its measurement
The sensor on a chip can both detect and measure single particles smaller than a single virus Forget all the nanotechnology devoted to fighting cancer, and just consider that nanoparticles have invaded makeup, anti-odor socks, sunscreen, plastic beer bottles and home pregnancy tests. Now scientists have developed a way to assess the health and environmental impact of such nanoparticles: a tiny microresonator that can detect and measure individual particles smaller than a single virus. The microresonator is a lab-on-a-chip that harnesses the "whispering gallery" concept that's displayed by buildings such as St. Paul's Cathedral in London. The cathedral's domed gallery can carry whispers easily across to the other side, but normal-volume voices end up garbled after bouncing around the dome multiple times. Similarly, microresonators can bounce laser light many times around a circular "waveguide," such as a glass ring. A laser frequency must perfectly fit the circumference of a ring to achieve thi
"This quality factor gives the sensor a resonance as beautiful as the pure tone form the finest musical instrument," says Jiangang Zhu, a graduate student in Yang's lab.
"Size is a key parameter that significantly affects the physical and chemical properties of nanoparticles," says Yang. "It plays a crucial role in the applications of nanoparticles both in science and in industry, all of which will benefit from the ability to measure these particles accurately."
Nanotechnology has already made it to the shelves of your local pharmacy and grocery: nanoparticles are found in anti-odor socks, makeup, makeup remover, sunscreen, anti-graffiti paint, home ...
Fri 18 Dec 09 from Phys.org
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The sensor on a chip can both detect and measure single particles smaller than a single virus Forget all the nanotechnology devoted to fighting cancer, and just consider that nanoparticles have ...
Fri 18 Dec 09 from Popular Science
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How safe are nanotechnology products that spill out of labs across the world? A group of researchers at Washington Univ. is devising instruments and protocols to assess the impact of nanoparticles ...
Tue 22 Dec 09 from R&D Mag
A tiny sensor that exploits the same physics as the whispering gallery will help make nanotechnology safer.
Mon 21 Dec 09 from ScienceDaily
Whispering galleriesThe sensor belongs to a class of devices charmingly called whispering-gallery-mode resonators.One famous whispering gallery is St. Paul's Cathedral in London. If you stand ...
Fri 18 Dec 09 from RedOrbit
A tiny sensor that exploits the same physics as the whispering gallery in St. Paul's Cathedral in London will help make nanotechnology safer.
Fri 18 Dec 09 from Eurekalert
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