Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Polymerization Inhibition for 3D Nanolithography

Abstract:
Being able to produce arbitrarily complex 3D structures through a simple fabrication method is the ultimate goal in nanostructure pattering. Direct-laser-writing (DLW) optical lithography could be the method of choice. Typically, photoinitiator molecules in a photoresist are excited via two-photon absorption by a tightly focused laser beam, which initiate a polymerization reaction only within the light focus. The polymerized region is then the building block for more complex structures that are usually created by scanning either sample or focus. However, due to the wave nature of light the focal spot cannot be smaller than about 100 nm. Therefore DLW is not yet a true nano-technology.

Polymerization Inhibition for 3D Nanolithography

Germany | Posted on April 5th, 2012

In 2010 Joachim Fischer and Martin Wegener (Karlsruhe Institute of Technology) succeeded in the implementation of diffraction unlimited DLW optical lithography by using a second beam to fully reversibly inhibit the polymerization in a stimulated emission depletion (STED) inspired configuration. Being able to stop the radical formation, which initiate the polymerization, makes it possible to only allow polymerization in a much smaller region than the focal spot rendering real nano-patterning possible.

Now the authors could undoubtfully identify the underling process for polymerization inhibition in a novel photoresist containing a ketocoumarin photoinitiator. Lithography experiments with time-delayed laser pulses of variable wavelengths revealed a slow and a fast component with distinct spectral signatures. The fast component exhibits a time constant of about 1 ns and spectrally follows the anticipated gain spectrum. Thus it can be assigned to stimulated emission. This analysis lays the foundation for systematically optimizing the conditions in next-generation STED-DLW optical lithography.

The research is reported in the first issue of Advanced Optical Materials, the new section in Advanced Materials (2010 IF: 10.880) dedicated to exploring light-matter interactions. The paper, "Ultrafast Polymerization Inhibition by Stimulated Emission Depletion for Three-dimensional Nanolithography", is available for free for Wiley Online Library now.

####

For more information, please click here

Copyright © Wiley-VCH Materials Science Journals

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

Lifeboat Foundation Responds to Largest Ebola Outbreak in History October 2nd, 2014

Iran's Sharif University to Host 4th Conference on Nanostructured Solar Cells October 2nd, 2014

Multifunctional Cotton Fabrics Produced in Iran Using Nanotechnology October 2nd, 2014

Graphene chips are close to significant commercialization October 1st, 2014

Discoveries

Multifunctional Cotton Fabrics Produced in Iran Using Nanotechnology October 2nd, 2014

Platinum meets its match in quantum dots from coal: Rice University's cheap hybrid outperforms rare metal as fuel-cell catalyst October 1st, 2014

Stressed Out: Research Sheds New Light on Why Rechargeable Batteries Fail October 1st, 2014

New Absorber Will Lead to Better Biosensor: Biosensors are more sensitive and able to detect smaller changes in the environment October 1st, 2014

Announcements

Lifeboat Foundation Responds to Largest Ebola Outbreak in History October 2nd, 2014

Iran's Sharif University to Host 4th Conference on Nanostructured Solar Cells October 2nd, 2014

Multifunctional Cotton Fabrics Produced in Iran Using Nanotechnology October 2nd, 2014

Graphene chips are close to significant commercialization October 1st, 2014

Photonics/Optics/Lasers

$18-million NSF investment aims to take flat materials to new heights: 2-D alternatives to graphene may enable exciting advances in electronics, photonics, sensors and other applications October 1st, 2014

New Absorber Will Lead to Better Biosensor: Biosensors are more sensitive and able to detect smaller changes in the environment October 1st, 2014

Speed at its limits September 30th, 2014

'Pixel' engineered electronics have growth potential: Rice, Oak Ridge, Vanderbilt, Penn scientists lead creation of atom-scale semiconducting composites September 29th, 2014

Printing/Lithography/Inkjet/Inks

'Greener,' low-cost transistor heralds advance in flexible electronics September 24th, 2014

RMIT delivers $30m boost to micro and nano-tech August 26th, 2014

SouthWest NanoTechnologies Appoints Matteson-Ridolfi for U.S. Distribution of its SMW™ Specialty Multiwall Carbon Nanotubes August 13th, 2014

An Inkjet-Printed Field-Effect Transistor for Label-Free Biosensing August 11th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE