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:4/5/2017)... , April 5, 2017 Today ... announcing that the server component of the HYPR platform ... for providing the end-to-end security architecture that empowers biometric ... HYPR has already secured over 15 million users ... including manufacturers of connected home product suites and physical ...
(Date:3/30/2017)... , March 30, 2017  On April 6-7, ... Hack the Genome hackathon at Microsoft,s headquarters ... two-day competition will focus on developing health and wellness ... Hack the Genome is the first ... tremendous. The world,s largest companies in the genomics, tech ...
(Date:3/28/2017)... March 28, 2017 The report ... (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, VMS), ... - Global Forecast to 2022", published by MarketsandMarkets, the ... and is projected to reach USD 75.64 Billion by ... 2022. The base year considered for the study is ...
Breaking Biology News(10 mins):
(Date:4/20/2017)... ... April 20, 2017 , ... Husson University will be ... growing body of knowledge during its Eighth Annual Research and Scholarship Day ... Darling Atrium. During the event, undergraduates, graduate students, and faculty members from all ...
(Date:4/20/2017)... ... April 20, 2017 , ... Parallel6™ , the leader in mClinical™ ... that they were named one of the 2017 Top 10 eClinical Trial Management ... the pharmaceutical industry. , “We take pride in honoring Parallel6 as one of the ...
(Date:4/20/2017)... -- For today, Stock-Callers.com redirects investors, attention to ... clinical research aimed at treating diseases and medical conditions. Under ... Inc. (NASDAQ: KERX), Kite Pharma Inc. (NASDAQ: KITE), and ZIOPHARM ... our complimentary research reports on these stocks now at: ... http://stock-callers.com/registration ...
(Date:4/19/2017)... ... April 18, 2017 , ... Optofluidics today announced ... comes after the company changed focus to making analytical tools for biopharmaceutical quality ... new technology,” says CEO Robert Hart. Founders Bernardo Cordovez, Robert Hart and David ...
Breaking Biology Technology: