Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button


DHgate

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

Electron's 1-D metallic surface state observed: A step for the prediction of electronic properties of extremely-fine metal nanowires in next-generation semiconductors February 9th, 2016

Nanoparticle therapy that uses LDL and fish oil kills liver cancer cells February 9th, 2016

Leading bugs to the death chamber: A kinder face of cholesterol February 8th, 2016

From allergens to anodes: Pollen derived battery electrodes February 8th, 2016

Discoveries

Electron's 1-D metallic surface state observed: A step for the prediction of electronic properties of extremely-fine metal nanowires in next-generation semiconductors February 9th, 2016

Nanoparticle therapy that uses LDL and fish oil kills liver cancer cells February 9th, 2016

Canadian physicists discover new properties of superconductivity February 8th, 2016

Leading bugs to the death chamber: A kinder face of cholesterol February 8th, 2016

Announcements

Electron's 1-D metallic surface state observed: A step for the prediction of electronic properties of extremely-fine metal nanowires in next-generation semiconductors February 9th, 2016

Nanoparticle therapy that uses LDL and fish oil kills liver cancer cells February 9th, 2016

A fast solidification process makes material crackle February 8th, 2016

From allergens to anodes: Pollen derived battery electrodes February 8th, 2016

Photonics/Optics/Lasers

Scientists create laser-activated superconductor February 8th, 2016

Nanoscale cavity strongly links quantum particles: Single photons can quickly modify individual electrons embedded in a semiconductor chip and vice versa February 8th, 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

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

Printing/Lithography/Inkjet/Inks

Teijin to Participate in Nano Tech 2016 January 21st, 2016

New bimetallic alloy nanoparticles for printed electronic circuits: Production of oxidation-resistant copper alloy nanoparticles by electrical explosion of wire for printed electronics January 5th, 2016

Photonic “sintering” may create new solar, electronics manufacturing technologies December 1st, 2015

Screen Printable Functionalised Graphene Ink November 3rd, 2015

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