Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Long-wavelength laser will be able to take medicine fingerprints

Cross-section of a prototype pFEL, with the free electron source on the right and the photonic crystal inside the red part.
Cross-section of a prototype pFEL, with the free electron source on the right and the photonic crystal inside the red part.

Abstract:
A laser capable of working in the terahertz range - that of long-wavelength light from the far infrared to 1 millimetre - enables the ‘fingerprint' of, say, a drug to be examined better than can be done using chemical analysis. To achieve this, PhD student Thomas Denis of the University of Twente's MESA+ Institute for Nanotechnology has combined the best of two worlds, a free electron source and photonic crystals. The result: greater flexibility and a compact laser.

Long-wavelength laser will be able to take medicine fingerprints

Enschede, Netherlands | Posted on December 20th, 2012

A terahertz laser is capable of showing the molecular structure of, say, a drug, because the laser beam it produces is at wavelengths suitable for examining molecular and atomic bonds. This enables more spatial information to be obtained than from chemical analysis, a detailed fingerprint. To date, however, the limitation has been that lasers of this type are restricted to particular wavelengths, e.g. because the source of the laser light is a semiconductor, in which electrons can only take on fixed energy states, hence only a limited number of ‘colours' of light can be produced.

Free electrons

In a free electron laser the electrons are not restricted to fixed states, as are electrons in a classic cathode ray tube. So Denis thought, why not combine a free electron source with a ‘photonic crystal'? This is a structure with lot of tiny ‘posts' that together slow down the incident light and turn it into a coherent beam. Photonic crystals can be created at micro level, e.g. for a lab-on-a-chip, or on a much larger scale. The dimensions and shape of the crystal determine the rough wavelength region, and the precise wavelength can be set and adjusted by changing the speed of the electrons being fired at it. This combination is known as a ‘photonic free-electron laser' or pFEL.

Looking inside the crystal

Existing terahertz lasers also have the disadvantage that they are very large, big enough to fill a room. Thanks to the use of photonic crystals the pFEL that Denis has designed is not much bigger than a domestic microwave oven and can still provide high power despite its small size. He has also found a special way of ‘looking' inside a photonic crystal - something that is not normally possible. By interfering slightly with the wavelength pattern in the crystal using a tiny metal ball the actual pattern can be measured.

Thomas Denis (Ahaus, 1981) received his PhD on 14 December for his thesis Theory and Design of Microwave Photonic Free-Electron Lasers. He carried out his research in Prof. Klaus Boller's Laser Physics and Non-linear Optics Group. The thesis, or the summary, is available in digital form on request.

####

For more information, please click here

Contacts:
P.O. Box 217
7500 AE Enschede, Netherlands
053-489 9111
053-489 2000


Wiebe van der Veen
+31612185692

Copyright © AlphaGalileo

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

Lithium battery catalyst found to harm key soil microorganism February 7th, 2016

Scientists take key step toward custom-made nanoscale chemical factories: Berkeley Lab researchers part of team that creates new function in tiny protein shell structures February 6th, 2016

Discovery of the specific properties of graphite-based carbon materials February 6th, 2016

Hepatitis virus-like particles as potential cancer treatment February 5th, 2016

Nanomedicine

Scientists take key step toward custom-made nanoscale chemical factories: Berkeley Lab researchers part of team that creates new function in tiny protein shell structures February 6th, 2016

Study reveals how herpes virus tricks the immune system February 5th, 2016

Hepatitis virus-like particles as potential cancer treatment February 5th, 2016

Researchers discover new phase of boron nitride and a new way to create pure c-BN February 5th, 2016

Discoveries

Lithium battery catalyst found to harm key soil microorganism February 7th, 2016

Scientists take key step toward custom-made nanoscale chemical factories: Berkeley Lab researchers part of team that creates new function in tiny protein shell structures February 6th, 2016

Discovery of the specific properties of graphite-based carbon materials February 6th, 2016

Hepatitis virus-like particles as potential cancer treatment February 5th, 2016

Announcements

Lithium battery catalyst found to harm key soil microorganism February 7th, 2016

Scientists take key step toward custom-made nanoscale chemical factories: Berkeley Lab researchers part of team that creates new function in tiny protein shell structures February 6th, 2016

Discovery of the specific properties of graphite-based carbon materials February 6th, 2016

Organic crystals allow creating flexible electronic devices: The researchers from the Faculty of Physics of the Moscow State University have grown organic crystals that allow creating flexible electronic devices February 5th, 2016

Tools

Researchers discover new phase of boron nitride and a new way to create pure c-BN February 5th, 2016

Cornell researchers create first self-assembled superconductor February 1st, 2016

New record in nanoelectronics at ultralow temperatures January 28th, 2016

LC.300 Series Nanopositioning Controller from nPoint January 28th, 2016

Photonics/Optics/Lasers

Organic crystals allow creating flexible electronic devices: The researchers from the Faculty of Physics of the Moscow State University have grown organic crystals that allow creating flexible electronic devices February 5th, 2016

Scientists guide gold nanoparticles to form 'diamond' superlattices: DNA scaffolds cage and coax nanoparticles into position to form crystalline arrangements that mimic the atomic structure of diamond February 4th, 2016

Nature Materials: Smallest lattice structure worldwide: 3-D lattice with glassy carbon struts and braces of less than 200 nm in diameter has higher specific strength than most solids February 3rd, 2016

Silicon-based metamaterials could bring photonic circuits February 1st, 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