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

Making magnets flip like cats at room temperature: Heusler alloy NiMnSb could prove valuable as a new material for digital information processing and storage July 25th, 2016

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Russian physicists discover a new approach for building quantum computers: Physicists find a way of 'bundling together' multiple elements of a quantum computer July 24th, 2016

A 'smart dress' for oil-degrading bacteria July 24th, 2016

Thin films

Cambridge Advanced Imaging Centre praises support film consistency and quality from EM Resolutions July 5th, 2016

Novel capping strategy improves stability of perovskite nanocrystals: Study addresses instability issues with organometal-halide perovskites, a promising class of materials for solar cells, LEDs, and other applications June 13th, 2016

New nanomaterial offers promise in bendable, wearable electronic devices: Electroplated polymer makes transparent, highly conductive, ultrathin film June 13th, 2016

Perovskite solar cells surpass 20 percent efficiency: EPFL researchers are pushing the limits of perovskite solar cell performance by exploring the best way to grow these crystals June 13th, 2016

Possible Futures

Making magnets flip like cats at room temperature: Heusler alloy NiMnSb could prove valuable as a new material for digital information processing and storage July 25th, 2016

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Russian physicists discover a new approach for building quantum computers: Physicists find a way of 'bundling together' multiple elements of a quantum computer July 24th, 2016

A 'smart dress' for oil-degrading bacteria July 24th, 2016

Nanomedicine

New remote-controlled microrobots for medical operations July 23rd, 2016

New superconducting coil improves MRI performance: UH-led research offers higher resolution, shorter scan time July 23rd, 2016

New probe developed for improved high resolution measurement of brain temperature: Improved accuracy could allow researchers to measure brain temperature in times of trauma when small deviations in temperature can lead to additional brain injury July 23rd, 2016

Nanoparticle versus cancer: Scientists have created nanoparticles which cure cancer harmlessly July 22nd, 2016

Nanobiotechnology

New remote-controlled microrobots for medical operations July 23rd, 2016

Nanoparticle versus cancer: Scientists have created nanoparticles which cure cancer harmlessly July 22nd, 2016

New reaction for the synthesis of nanostructures July 21st, 2016

Research examines how to optimize nanoparticles for efficient drug delivery July 21st, 2016

Photonics/Optics/Lasers

RMIT researchers make leap in measuring quantum states July 21st, 2016

The birth of quantum holography: Making holograms of single light particles! July 21st, 2016

Graphene photodetectors: Thinking outside the 2-D box July 21st, 2016

Scientists develop way to upsize nanostructures into light, flexible 3-D printed materials: Virginia Tech, Livermore National Lab researchers develop hierarchical 3-D printed metallic materials July 20th, 2016

Solar/Photovoltaic

An accelerated pipeline to open materials research: ORNL workflow system unites imaging, algorithms, and HPC to advance materials discovery and design July 24th, 2016

Researchers discover key mechanism for producing solar cells: Better understanding of perovskite solar cells could boost widespread use July 21st, 2016

The future of perovskite solar cells has just got brighter -- come rain or shine: Korean researchers at POSTECH have succeeded in developing high-efficiency perovskite solar cells that retain excellent performance over two months in a very humid condition July 21st, 2016

Scientists develop way to upsize nanostructures into light, flexible 3-D printed materials: Virginia Tech, Livermore National Lab researchers develop hierarchical 3-D printed metallic materials July 20th, 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







Car Brands
Buy website traffic