Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Sharpening the plasmon nanofocus

By placing a palladium nanoparticle on the focusing tip of a gold "nanoantenna," they were able to clearly detect changes in the palladium's optical properties upon exposure to hydrogen.
By placing a palladium nanoparticle on the focusing tip of a gold "nanoantenna," they were able to clearly detect changes in the palladium's optical properties upon exposure to hydrogen.

Abstract:
Plasmonics is one of the hottest fields in technology today. Electronic surface waves called plasmons can be generated by confining electromagnetic waves shorter than half the wavelength of incident light, for example at the interface between gold nanostructures and insulating air.

Sharpening the plasmon nanofocus

Berkeley, CA | Posted on June 27th, 2011

If the oscillation frequency of the plasmons and the electromagnetic waves matches, the electromagnetic field can be "nanofocused" within a few hundred cubic nanometers. Nanofocusing can be used with dark-field microscopy to detect low concentrations of biochemical agents, single catalysis in nanoreactors, and other processes. Plasmonic sensing is especially promising for detecting flammable gases like hydrogen, where electrical sensors pose safety issues because of possible sparking.

Researchers with DOE's Lawrence Berkeley National Laboratory in collaboration with colleagues at the University of Stuttgart, Germany, reported the first experimental demonstration of nanofocusing to enhance gas sensing at the single-particle level in the journal Nature Materials. By placing a palladium nanoparticle on the focusing tip of a gold "nanoantenna," they were able to clearly detect changes in the palladium's optical properties upon exposure to hydrogen.

"Metallic nanostructures with sharp corners and edges that form a pointed tip are especially favorable for plasmonic sensing, because the field strengths of the electromagnetic waves are so strongly enhanced over such an extremely small sensing volume," says Laura Na Liu, lead author of the Nature Materials paper, now at Rice University and formerly with the research group of Paul Alivisatos, Berkeley Lab's Director, who led the work.

"We have demonstrated resonant, antenna-enhanced, single-particle hydrogen sensing in the visible region and presented a fabrication approach to the positioning of a single palladium nanoparticle in the nanofocus of a gold nanoantenna," says Alivisatos. "Our concept provides a general blueprint for amplifying plasmonic-sensing signals at the single-particle level and should pave the road for the optical observation of chemical reactions and catalytic activities in nanoreactors and for local biosensing."

####

About Berkeley Lab
Lawrence Berkeley National Laboratory addresses the world’s most urgent scientific challenges by advancing sustainable energy, protecting human health, creating new materials, and revealing the origin and fate of the universe. Founded in 1931, Berkeley Lab’s scientific expertise has been recognized with 12 Nobel prizes. The University of California manages Berkeley Lab for the U.S. Department of Energy’s Office of Science.

For more information, please click here

Contacts:
Paul Preuss
510.486.6249

Copyright © Berkeley Lab

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Strength of hair inspires new materials for body armor January 18th, 2017

Self-assembling particles brighten future of LED lighting January 18th, 2017

Dressing a metal in various colors: DGIST research developed a technology to coat metal with several nanometers of semiconducting materials January 17th, 2017

Nanoparticle exposure can awaken dormant viruses in the lungs January 17th, 2017

Seeing the quantum future... literally: What if big data could help you see the future and prevent your mobile phone from breaking before it happened? January 16th, 2017

Laboratories

Nanoscale view of energy storage January 16th, 2017

Chemistry on the edge: Experiments at Berkeley Lab confirm that structural defects at the periphery are key in catalyst function January 13th, 2017

Recreating conditions inside stars with compact lasers: Scientists offer a new path to creating the extreme conditions found in stars, using ultra-short laser pulses irradiating nanowires January 12th, 2017

Govt.-Legislation/Regulation/Funding/Policy

Strength of hair inspires new materials for body armor January 18th, 2017

Self-assembling particles brighten future of LED lighting January 18th, 2017

Nanoscale view of energy storage January 16th, 2017

Chemistry on the edge: Experiments at Berkeley Lab confirm that structural defects at the periphery are key in catalyst function January 13th, 2017

Sensors

Nanoscale Modifications can be used to Engineer Electrical Contacts for Nanodevices January 13th, 2017

Researchers create practical and versatile microscopic optomechanical device: Trapping light and mechanical waves within a tiny bullseye, design could enable more sensitive motion detection January 11th, 2017

STMicroelectronics Peps Up Booming Social-Fitness Scene with Smart Motion Sensors for Better Accuracy, Longer Battery Life, and Faster Time to Market January 2nd, 2017

Advance in intense pulsed light sintering opens door to improved electronics manufacturing December 23rd, 2016

Discoveries

Strength of hair inspires new materials for body armor January 18th, 2017

Self-assembling particles brighten future of LED lighting January 18th, 2017

Dressing a metal in various colors: DGIST research developed a technology to coat metal with several nanometers of semiconducting materials January 17th, 2017

Nanoparticle exposure can awaken dormant viruses in the lungs January 17th, 2017

Announcements

Strength of hair inspires new materials for body armor January 18th, 2017

Self-assembling particles brighten future of LED lighting January 18th, 2017

Dressing a metal in various colors: DGIST research developed a technology to coat metal with several nanometers of semiconducting materials January 17th, 2017

Nanoparticle exposure can awaken dormant viruses in the lungs January 17th, 2017

Photonics/Optics/Lasers

Recreating conditions inside stars with compact lasers: Scientists offer a new path to creating the extreme conditions found in stars, using ultra-short laser pulses irradiating nanowires January 12th, 2017

New laser based on unusual physics phenomenon could improve telecommunications, computing January 12th, 2017

Researcher's discovery of new crystal structure holds promise for optoelectronic devices January 6th, 2017

The researchers created a tiny laser using nanoparticles January 5th, 2017

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project