Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Imecís novel strategy to tune plasmon resonances has potential applications in biomolecular detection

Schematic illustration of various shapes of plasmonic nanostructures and (bottom) the corresponding electron microscopy images.
Schematic illustration of various shapes of plasmonic nanostructures and (bottom) the corresponding electron microscopy images.

Abstract:
Researchers at imec have developed an innovative strategy to tune plasmon resonances. They do so by breaking the symmetric geometry of the nanostructures, using a combination of bottom-up and top-down fabrication processes. Such broken symmetry can lead to strongly enhanced local electric fields. A potential application is the detection of biomolecules via surface-enhanced Raman scattering (SERS).

Imecís novel strategy to tune plasmon resonances has potential applications in biomolecular detection

The Netherlands | Posted on April 21st, 2010

Metal-based nanophotonics (plasmonics) is a field concerned with manipulating and focusing light on nanoscale structures that are much smaller than conventional optic components. Plasmonic technology, today still in an experimental stage, has the potential to be used in future applications such as nanoscale optical interconnects for high performance computer chips, highly efficient thin-film solar cells, and extremely sensitive (bio)molecular sensors.

Plasmonic applications can be made from nanostructured (noble) metals. When such nanostructures are illuminated with visible to near-infrared light, the excitation of collective oscillations of conduction electrons - called surface plasmons - generates strong optical resonances, focusing electromagnetic energy in deep-sub-wavelength-scales. The resonance spectra of the metallic nanostructures strongly depend on their geometry. Imec has extensive experience in synthesizing various shapes of nanostructures to tune the resonances from the ultraviolet to the near-infrared region. Examples of such shapes are nanospheres, nanocubes, nanorods, nanoshells, and nanorings.

Recently, researchers at imec have developed an innovative strategy to precisely tune the plasmon resonances. They do so by breaking the symmetric geometry of the nanostructures, using a combination of bottom-up and top-down fabrication processes. This allows making a geometrical transition from nanocubes to nanoplates (see Jian Ye, et al. Nanotechnology, 2008, 19, 325702), from nanoshells to semishells and nanobowls (see Jian Ye, et al. the Journal of Physical Chemistry C, 2009, 113, 3110; Jian Ye, et al. Langmuir, 2009, 25, 1822; Jian Ye, et al. ACS Nano, 2010, 4, 1457), from nanocages to open-nanocages (see Jian Ye, et al. Optics Express, 2009, 17, 23765).

Combining bottom-up and top-down fabrication turns out to be a cost-effective method to obtain large areas covered with engineered metal nanostructures. The nano-dimensions are still set by the bottom-up fabrication procedures, and the geometrical tweaking occurs through well-characterized top-down fabrication techniques such as metal evaporation and ion milling.

Imec has gained a substantial insight in the optical properties of these nanostructures using a combination of electromagnetic simulations and advanced optical spectroscopy. This allows explaining the optical properties using the so-called plasmon hybridization model, where the resonances of complex nanostructures can be described as bonding and anti-bonding arrangements of the parent plasmon resonances of the individual constituents. This paves the way to tweaking the optical properties of metal nanostructures for various applications. More specifically, the broken symmetry can lead to strongly enhanced local electric fields, which show a potential application in surface-enhanced Raman scattering-based bio-molecular detection.

####

About imec
Imec is Europeís largest independent research center in nanoelectronics and nano-technology. Its staff of more than 1,750 people includes over 550 industrial residents and guest researchers. Imecís research is applied in better healthcare, smart electronics, sustainable energy, and safer transport.

For more information, please click here

Copyright © imec

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

A toolkit for transformable materials: How to design materials with reprogrammable shape and function January 20th, 2017

Explaining how 2-D materials break at the atomic level January 20th, 2017

New research helps to meet the challenges of nanotechnology: Research helps to make the most of nanoscale catalytic effects for nanotechnology January 20th, 2017

Ultra-precise chip-scale sensor detects unprecedentedly small changes at the nanoscale January 20th, 2017

Thin films

New material with ferroelectricity and ferromagnetism may lead to better computer memory December 21st, 2016

ANU invention to inspire new night-vision specs December 7th, 2016

Ultra-thin ferroelectric material for next-generation electronics October 12th, 2016

Continuous roll-process technology for transferring and packaging flexible LSI August 29th, 2016

Possible Futures

A toolkit for transformable materials: How to design materials with reprogrammable shape and function January 20th, 2017

Explaining how 2-D materials break at the atomic level January 20th, 2017

New research helps to meet the challenges of nanotechnology: Research helps to make the most of nanoscale catalytic effects for nanotechnology January 20th, 2017

Ultra-precise chip-scale sensor detects unprecedentedly small changes at the nanoscale January 20th, 2017

Nanomedicine

New research helps to meet the challenges of nanotechnology: Research helps to make the most of nanoscale catalytic effects for nanotechnology January 20th, 2017

Chemists Cook up New Nanomaterial and Imaging Method: Nanomaterials can store all kinds of things, including energy, drugs and other cargo January 19th, 2017

'5-D protein fingerprinting' could give insights into Alzheimer's, Parkinson's January 19th, 2017

New active filaments mimic biology to transport nano-cargo: A new design for a fully biocompatible motility engine transports colloidal particles faster than diffusion with active filaments January 11th, 2017

Nanobiotechnology

New research helps to meet the challenges of nanotechnology: Research helps to make the most of nanoscale catalytic effects for nanotechnology January 20th, 2017

Chemists Cook up New Nanomaterial and Imaging Method: Nanomaterials can store all kinds of things, including energy, drugs and other cargo January 19th, 2017

'5-D protein fingerprinting' could give insights into Alzheimer's, Parkinson's January 19th, 2017

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

Solar/Photovoltaic

Chemists Cook up New Nanomaterial and Imaging Method: Nanomaterials can store all kinds of things, including energy, drugs and other cargo January 19th, 2017

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

Stability challenge in perovskite solar cell technology: New research reveals intrinsic instability issues of iodine-containing perovskite solar cells December 26th, 2016

Going green with nanotechnology December 21st, 2016

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