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

Renishaw receives Queen's Award for spectroscopy developments November 25th, 2014

JPK reports on the use of AFM and the CellHesion module to study plant cells at the University of Queensland November 25th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Discoveries

Lawrence Livermore researchers develop efficient method to produce nanoporous metals November 25th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Blu-ray disc can be used to improve solar cell performance: Data storage pattern transferred to solar cell increases light absorption November 25th, 2014

Announcements

Renishaw receives Queen's Award for spectroscopy developments November 25th, 2014

JPK reports on the use of AFM and the CellHesion module to study plant cells at the University of Queensland November 25th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Photonics/Optics/Lasers

NRL Scientists Discover Novel Metamaterial Properties within Hexagonal Boron Nitride November 20th, 2014

Penn engineers efficiently 'mix' light at the nanoscale November 17th, 2014

'Direct writing' of diamond patterns from graphite a potential technological leap November 5th, 2014

Outsmarting Thermodynamics in Self-assembly of Nanostructures: Berkeley Lab reports method for symmetry-breaking in feedback-driven self-assembly of optical metamaterials November 4th, 2014

Printing/Lithography/Inkjet/Inks

Canatu Launches CNB In-Mold Film for Transparent Touch on 3D Surfaces –in Cars, Household Appliances, Wearables, Portables November 20th, 2014

SouthWest NanoTechnologies to Demonstrate 3D Capacitive Touch Sensor Featuring Transparent, Thermoformed Carbon Nanotube Ink at Printed Electronics USA 2014 (Booth J25) -- “Conductive and Semiconducting Single-Wall Carbon Nanotube Inks” will be Topic of Company Presentation November 10th, 2014

Longhorn beetle inspires ink to fight counterfeiting November 5th, 2014

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 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