Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

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

Ag/ZnO-Nanorods Schottky diodes based UV-PDs are fabricated and tested May 26th, 2017

New metamaterial-enhanced MRI technique tested on humans May 26th, 2017

Controlling 3-D behavior of biological cells using laser holographic techniques May 26th, 2017

Unveiling the quantum necklace: Researchers simulate quantum necklace-like structures in superfluids May 26th, 2017

Discoveries

Ag/ZnO-Nanorods Schottky diodes based UV-PDs are fabricated and tested May 26th, 2017

New metamaterial-enhanced MRI technique tested on humans May 26th, 2017

Controlling 3-D behavior of biological cells using laser holographic techniques May 26th, 2017

Unveiling the quantum necklace: Researchers simulate quantum necklace-like structures in superfluids May 26th, 2017

Announcements

Ag/ZnO-Nanorods Schottky diodes based UV-PDs are fabricated and tested May 26th, 2017

New metamaterial-enhanced MRI technique tested on humans May 26th, 2017

Controlling 3-D behavior of biological cells using laser holographic techniques May 26th, 2017

Unveiling the quantum necklace: Researchers simulate quantum necklace-like structures in superfluids May 26th, 2017

Photonics/Optics/Lasers

Controlling 3-D behavior of biological cells using laser holographic techniques May 26th, 2017

Researchers find new way to control light with electric fields May 25th, 2017

Zap! Graphene is bad news for bacteria: Rice, Ben-Gurion universities show laser-induced graphene kills bacteria, resists biofouling May 22nd, 2017

Plasmon-powered upconversion nanocrystals for enhanced bioimaging and polarized emission: Plasmonic gold nanorods brighten lanthanide-doped upconversion superdots for improved multiphoton bioimaging contrast and enable polarization-selective nonlinear emissions for novel nanoscal May 19th, 2017

Printing/Lithography/Inkjet/Inks/Bio-printing

Liquid metal nano printing set to revolutionize electronics: Creating integrated circuits just atoms thick February 18th, 2017

New stem cell technique shows promise for bone repair January 25th, 2017

NUS researchers achieve major breakthrough in flexible electronics: New classes of printable electrically conducting polymer materials make better electrodes for plastic electronics and advanced semiconductor devices January 14th, 2017

Nanowire 'inks' enable paper-based printable electronics: Highly conductive films make functional circuits without adding high heat January 4th, 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