Navigation Links
Tiny rulers to measure nanoscale structures
Date:8/31/2010

This release is also available in Chinese on EurekAlert! Chinese.

College Park, MD (August 31, 2010) -- With the advent of nanometer-sized machines, there is considerable demand for stable, precise tools to measure absolute distances and distance changes. One way to do this is with a plasmon ruler. In physics jargon, a "plasmon" is the quasiparticle resulting from the quantization of plasma oscillation; it's essentially the collective oscillations of the free electron gas at a metallic surface, often at optical frequencies.

A noble metallic dimer (a molecule that results from combining two entities of the same species) has been used as a plasmon ruler to make absolute distance and distance change measurements.

Physicists at China's Wuhan University discovered that nanospheres combined with a nanorod dimer could be used to solve the problem of measurement sensitivity. They provide details about their findings in the American Institute of Physics' Journal of Applied Physics.

Shao-Ding Liu and Mu-Tian Cheng used a nanostructure as a linear plasmon ruler. Nanospheres were used to modify surface plasmon coupling of a nanorod dimer. They found that the resonance wavelength shift increases approximately linearly with the increasing of a nanosphere's interparticle separations -- resulting in a structure that's useful as a plasmon ruler with homogenous measurement sensitivity.

"A nanoparticle dimer plasmon ruler possesses many advantages because its measurement sensitivity is homogeneous, it can operate in the near-infrared region, and the structure's size and nanorod aspect ratio can be modified freely to get the desired measurement range and sensitivity," notes Liu.

Applications for the linear plasmon ruler extend beyond studies of optical properties of metallic nanostructures to single-molecule microscopy, surface-enhanced Raman spectroscopy, waveguiding and biosensing.


'/>"/>

Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert  

Related biology news :

1. Lollipops and ice fishing: Molecular rulers used to probe nanopores
2. NIAID announces 25 new awards to develop radiation countermeasures
3. UI researchers help to improve carbon measurements in global climate studies
4. A model to measure soil health in the era of bioenergy
5. Light pollution offers new global measure of coral reef health
6. ESA tests laser to measure atmospheric carbon dioxide
7. Scientists use lasers to measure changes to tropical forests
8. Researchers unzip molecules to measure interactions keeping DNA packed in cells
9. Ecologists report quantifiable measures of natures services to humans
10. Carbon accounting from atmospheric measurements -- the aircraft perspective
11. Fattysaurus or thinnysaurus? How dinosaurs measure up with laser imaging
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Tiny rulers to measure nanoscale structures
(Date:4/11/2017)... April 11, 2017 NXT-ID, Inc. (NASDAQ: ... company, announces the appointment of independent Directors Mr. Robin ... its Board of Directors, furthering the company,s corporate governance and ... Gino Pereira ... look forward to their guidance and benefiting from their considerable ...
(Date:4/4/2017)... 2017   EyeLock LLC , a leader of ... States Patent and Trademark Office (USPTO) has issued U.S. ... of an iris image with a face image acquired ... company,s 45 th issued patent. ... given the multi-modal biometric capabilities that have recently come ...
(Date:3/29/2017)... March 29, 2017  higi, the health IT company ... North America , today announced a Series ... acquisition of EveryMove. The new investment and acquisition accelerates ... tools to transform population health activities through the collection ... higi collects and secures data today on ...
Breaking Biology News(10 mins):
(Date:7/24/2017)... Intralytix, Inc. announced that it received $17.5 million in ... This investment marks the beginning of a close collaboration ... for various benefits in human health and in other ... As a global key player in yeasts ... for baking, food taste & pleasure, health care, and ...
(Date:7/24/2017)... FL (PRWEB) , ... July ... ... Strategic Analyst, Kenny Soulstring, today announced that the stock market news outlet ... in risk assessment diagnostic testing that screens and identifies exposure, progression and ...
(Date:7/20/2017)... ... July 20, 2017 , ... ... leading radiology and imaging centers around the U.S. that offer MR Elastography for ... alternative to needle biopsy for staging liver fibrosis assessment. , “MRE:connect was ...
(Date:7/20/2017)... ... July 20, 2017 , ... Litmus Health ... announced its full advisory board. The board comprises leaders spanning business, technology, academia, ... PhD, former VP of Engineering, to Chief Technology Officer. Crooks will lead strategy ...
Breaking Biology Technology: