Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Altering organic molecules' interaction with light: MIT researchers discover a new platform that provides simple means to manipulate organic molecules' emission, and may have important implications to organic light emitting devices and molecular biosensors

Pictured is a representation of organic molecules (shown as yellow spheres) suspended on a photonic crystal slab (shown as a grey substrate) supporting macroscopic resonances. Bo Zhen et al. found that when molecules are brought to within 100 nm from the slab surface, they no longer send out light isotropically in all directions, but instead send light of the same wavelengths into specific directions, as depicted by the light cones. This dramatic modified emission compared to the molecules' emission without the crystal slab's presence could have important implications for organic light emitting devices and molecular sensing.

Credit: Image courtesy of Yan Liang (l2xy2.com) and Bo Zhen.
Pictured is a representation of organic molecules (shown as yellow spheres) suspended on a photonic crystal slab (shown as a grey substrate) supporting macroscopic resonances. Bo Zhen et al. found that when molecules are brought to within 100 nm from the slab surface, they no longer send out light isotropically in all directions, but instead send light of the same wavelengths into specific directions, as depicted by the light cones. This dramatic modified emission compared to the molecules' emission without the crystal slab's presence could have important implications for organic light emitting devices and molecular sensing.

Credit: Image courtesy of Yan Liang (l2xy2.com) and Bo Zhen.

Abstract:
Enhancing and manipulating the light emission of organic molecules is at heart of many important technological and scientific advances, including in the fields of organic light emitting devices, bio-imaging, bio-molecular detection. Researchers at MIT have now discovered a new platform that enables dramatic manipulation of the emission of organic molecules when simply suspended on top of a carefully designed planar slab with a periodic array of holes: so-called photonic crystal surface.

Altering organic molecules' interaction with light: MIT researchers discover a new platform that provides simple means to manipulate organic molecules' emission, and may have important implications to organic light emitting devices and molecular biosensors

Cambridge, MA | Posted on August 8th, 2013

Influenced by the fast and directional emission channels (called 'resonances') provided by the photonic crystal surface, molecules in the solution that are suspended on top of the surface no longer behave in their usual fashion: instead of sending light isotropically into all directions, they rather send light into specific directions.

The researchers say that this platform could also be applied to enhance other type of interactions of light with matter, such as Raman scattering. Furthermore, this process applies to any other nano-emitters as well, such as quantum dots.

Physics Professors Marin Soljacic and John Joannopoulos, Associate Professor of Applied Mathematics Steven Johnson, Research scientist Dr. Ofer Shapira, Postdocs Dr. Alejandro Rodriguez, Dr. Xiangdong Liang, and graduate students Bo Zhen, Song-Liang Chua, Jeongwon Lee report this discovery as featured in Proceedings of the National Academy of Sciences.

"Most fluorescing molecules are like faint light bulbs uniformly emitting light into all directions," says Soljacic. Researchers have often sought to enhance this emission by incorporating organic emitters into sub-wavelength structured cavities that are usually made out of inorganic materials. However, the challenge lies in an inherent incompatibility in the fabrication of cavities for such hybrid systems.

Zhen et al present a simple and direct methodology to incorporate the organic emitters into their structures. By introducing a microfluidic channel on top of the photonic crystal surface, organic molecules in solution are delivered to the active region where interaction with light is enhanced. Each molecule then absorbs and emits significantly more energy with an emission pattern that can be designed to be highly directional. "Now we can turn molecules from being simple light bulbs to powerful flashlights that are thousands of times stronger and can all be aligned towards the same direction," says Shapira, the senior author of the paper.

This discovery lends itself to a number of practical applications. "During normal blood tests, for example," adds Shapira, "cells and proteins are labeled with antibodies and fluorescing molecules that allow their recognition and detection. Their detection limit could be significantly improved using such a system due to the enhanced directional emission from the molecules."

The researchers also demonstrated that the directional emission can be turned into organic lasers with low input powers. "This lasing demonstration truly highlights the novelty of this system," says the first author Zhen. For almost any lasing system to work there is a barrier on the input power level, named the lasing threshold, below which lasing will not happen. Naturally, the lower the threshold, the less power it takes to turn on this laser. Exploring the enhancement mechanisms present in the current platform, lasing was observed with a substantially lower barrier than before: the measured threshold in this new system is at least an order of magnitude lower than any previously reported results using the same molecules.

###

This work was supported by MIT S3TEC Center, Institute for Soldier Nanotechnologies, Materials Research Science and National Science Foundation, Defense Advanced Research Projects Agency, and Air Force Office of Scientific Research Multidisciplinary Research Program.

####

For more information, please click here

Contacts:
Bo Zhen

617-852-7541

Copyright © MIT, Institute for Soldier Nanotechnologies

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

Nanobiotix: The Independent Data Monitoring Committee Recommends the Continuation of the Ongoing Phase II/III Trial of NBTXR3 in Soft Tissue Sarcoma March 23rd, 2017

Leti Presents Advances in Propagation Modeling and Antenna Design for mmWave Spectrum: Paper Is One of 15 that Leti Presented at European Conference on Antennas and Propagation March 19-24 March 23rd, 2017

Rice U. refines filters for greener natural gas: New study defines best materials for carbon capture, methane selectivity March 23rd, 2017

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Imaging

Caught on camera -- chemical reactions 'filmed' at the single-molecule level March 22nd, 2017

Next-gen steel under the microscope March 18th, 2017

Novel nozzle saves crystals: Double flow concept widens spectrum for protein crystallography March 17th, 2017

JPK’s NanoWizard® AFM systems are used at the University of Sheffield to understand soft matter and biological systems at the molecular scale March 7th, 2017

Display technology/LEDs/SS Lighting/OLEDs

UC researchers use gold coating to control luminescence of nanowires: University of Cincinnati physicists manipulate nanowire semiconductors in pursuit of making electronics smaller, faster and cheaper March 17th, 2017

Perovskite edges can be tuned for optoelectronic performance: Layered 2D material improves efficiency for solar cells and LEDs March 10th, 2017

Govt.-Legislation/Regulation/Funding/Policy

Nanobiotix: The Independent Data Monitoring Committee Recommends the Continuation of the Ongoing Phase II/III Trial of NBTXR3 in Soft Tissue Sarcoma March 23rd, 2017

Rice U. refines filters for greener natural gas: New study defines best materials for carbon capture, methane selectivity March 23rd, 2017

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Scientists discover new 'boat' form of promising semiconductor: GeSe Uncommon form attenuates semiconductor's band gap size March 23rd, 2017

Discoveries

Rice U. refines filters for greener natural gas: New study defines best materials for carbon capture, methane selectivity March 23rd, 2017

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Scientists discover new 'boat' form of promising semiconductor: GeSe Uncommon form attenuates semiconductor's band gap size March 23rd, 2017

Caught on camera -- chemical reactions 'filmed' at the single-molecule level March 22nd, 2017

Announcements

Nanobiotix: The Independent Data Monitoring Committee Recommends the Continuation of the Ongoing Phase II/III Trial of NBTXR3 in Soft Tissue Sarcoma March 23rd, 2017

Leti Presents Advances in Propagation Modeling and Antenna Design for mmWave Spectrum: Paper Is One of 15 that Leti Presented at European Conference on Antennas and Propagation March 19-24 March 23rd, 2017

Rice U. refines filters for greener natural gas: New study defines best materials for carbon capture, methane selectivity March 23rd, 2017

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Military

Graphene sheets capture cells efficiently: New method could enable pinpoint diagnostics on individual blood cells March 3rd, 2017

Bioinspired process makes materials light, robust, programmable at nano- to macro-scale: Ultralight web of silk nano fibers withstands load 4,000 times its weight February 28th, 2017

'Lossless' metamaterial could boost efficiency of lasers and other light-based devices February 20th, 2017

Engineers shrink microscope to dime-sized device February 17th, 2017

Photonics/Optics/Lasers

Electro-optical switch transmits data at record-low temperatures: Operating at temperatures near absolute zero, switch could enable significantly faster data processing with lower power consumption March 20th, 2017

AIM Photonics Welcomes Coventor as Newest Member: US-Backed Initiative Taps Process Modeling Specialist to Enable Manufacturing of High-Yield, High-Performance Integrated Photonic Designs March 16th, 2017

Optical fingerprint can reveal pollutants in the air: Researchers at Chalmers University of Technology have proposed a new, sophisticated method of detecting molecules with sensors based on ultra-thin nanomaterials March 15th, 2017

MIPT physicists predict the existence of unusual optical composites March 10th, 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