Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Empa researchers use electron beams for chemical reactions: Nanostructures stabilise lasers

The principle of the local deposition process which is induced with a focussed electron beam (in short, FEBIP): molecules from a gas-injection system are deposited on the sample surface in a reversible manner. The focussed electron beam dissociates adsorbed gas molecules. The resulting non-volatile compounds remain permanently on the sample.
The principle of the local deposition process which is induced with a focussed electron beam (in short, FEBIP): molecules from a gas-injection system are deposited on the sample surface in a reversible manner. The focussed electron beam dissociates adsorbed gas molecules. The resulting non-volatile compounds remain permanently on the sample.

Abstract:
Electron microscopes use focussed electron beams to make extremely small objects visible. By combining the instrument with a gas-injection system material samples can be manipulated and surface structures measuring only nanometres across can be "written". Empa researchers, together with scientists from EPFL, used this method to improve lasers.

Empa researchers use electron beams for chemical reactions: Nanostructures stabilise lasers

Switzerland | Posted on April 15th, 2011

The vertical cavity surface emitting laser (VCSEL) is a semiconductor laser which is often used in data transmission for short-distance links like Gigabit Ethernet. These lasers are very popular in telecommunications because they consume little energy and can be simply fabricated in volumes of many tens of thousands on a single wafer. However, these VCSELs can exhibit one weakness: Because of the cylindrical structure in which the lasers are built up on the wafer, the polarisation of the emitted light can sometimes change during operation. Polarisation is a property of certain waves, such as light waves, and it describes the direction of oscillation. A stable polarisation is necessary in order to reduce transmission errors and to use VCSELs in future silicon photonics.

The team led by Empa researcher Ivo Utke, together with scientists from the Laboratory of Physics of Nanostructures at EPFL, could provide assistance by using a method called FEBIP (focussed electron beam induced processing). "We've written flat grating structures on the VCSELs with an electron beam," says Utke in describing their solution, "and the gratings were effective in stabilising the polarisation." The study has recently been published in the scientific journal "Nanoscale" as an advanced online publication.

Small, minimally invasive, direct

FEBIP is suitable for prototyping nanocomponents, in order to solve specific questions and problems in applied nanoelectronics, nanophotonics and nanobiology. Suitable gas molecules are injected close to a sample which is already in the microscope's vacuum chamber. These adsorb on the sample in a reversible manner. The focussed electron beam, which normally serves to make objects visible, now instead induces chemical reactions of the adsorbed gas molecules, but only at the spot where the beam strikes the surface. The resulting non-volatile molecular fragments then remain permanently on the sample while the volatile fragments are removed by the vacuum system. "With the help of a precisely positioned electron beam, it's possible to remove or apply surface structures with nanometre precision and in virtually any desired three-dimensional shapes," explains Utke.

"FEBIP could soon become a true nanofabrication platform for rapid prototyping of nanostructures in a minimally invasive way, without necessitating the large investment of a clean room."

Book reference

"Nanofabrication using focused ion and electron beams: principles and applications", Editors I. Utke, S. Moshkalev, P. Russels, Oxford Series in Nanomanufacturing. N.Y., Oxford University Press (Nov 2011,), ISBN 9780199734214

####

About Empa
Empa is an interdisciplinary research and services institution for material sciences and technology development within the ETH Domain. Empa’s research and development activities are oriented to meeting the requirements of industry and the needs of our society, and link together applications-oriented research and the practical implementation of new ideas, science and industry, and science and society.

For more information, please click here

Contacts:
* Dr. Ivo Utke
Laboratory for Mechanics of Materials and Nanostructures
Phone +41 33 228 29 57


Redaktion / Medienkontakte

* Beatrice Huber
Communications
Phone +41 58 765 47 33

Copyright © Empa

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 Links

“Polarisation stabilisation of vertical cavity surface emitting lasers by minimally invasive focused electron beam triggered chemistry”, I. Utke, M. Jenke, C. Roeling, P. H. Thiesen, V. Iakovlev, A. Syrbu, A. Mereuta, A. Caliman, E. Kapon, Nanoscale

Related News Press

News and information

Get ready for NanoDays! March 5th, 2015

American Chemical Society Presidential Symposia: nanoscience, international chemistry March 5th, 2015

CiQUS researchers obtain high-quality perovskites over large areas by a chemical method March 4th, 2015

Arrowhead to Present at 2015 Barclays Global Healthcare Conference March 4th, 2015

Laboratories

American Chemical Society Presidential Symposia: nanoscience, international chemistry March 5th, 2015

New research could lead to more efficient electrical energy storage March 4th, 2015

Researchers turn unzipped nanotubes into possible alternative for platinum: Aerogel catalyst shows promise for fuel cells March 2nd, 2015

Dendrite eraser: New electrolyte rids batteries of short-circuiting fibers: Solution enables a battery with both high efficiency & current density February 24th, 2015

Imaging

Forbidden quantum leaps possible with high-res spectroscopy March 2nd, 2015

International research partnership tricks the light fantastic March 2nd, 2015

Important step towards quantum computing: Metals at atomic scale March 2nd, 2015

Chemistry

Chromium-Centered Cycloparaphenylene Rings as New Tools for Making Functionalized Nanocarbons February 24th, 2015

Stretch and relax! -- Losing 1 electron switches magnetism on in dichromium February 23rd, 2015

A straightforward, rapid and continuous method to protect MOF nanocrystals against water February 9th, 2015

Discoveries

American Chemical Society Presidential Symposia: nanoscience, international chemistry March 5th, 2015

Experiment and theory unite at last in debate over microbial nanowires: New model and experiments settle debate over metallic-like conductivity of microbial nanowires in bacterium March 4th, 2015

Magnetic vortices in nanodisks reveal information: Researchers from Dresden and Jülich use microwaves to read out information from smallest storage devices March 4th, 2015

CiQUS researchers obtain high-quality perovskites over large areas by a chemical method March 4th, 2015

Announcements

Get ready for NanoDays! March 5th, 2015

American Chemical Society Presidential Symposia: nanoscience, international chemistry March 5th, 2015

CiQUS researchers obtain high-quality perovskites over large areas by a chemical method March 4th, 2015

Arrowhead to Present at 2015 Barclays Global Healthcare Conference March 4th, 2015

Tools

Keysight Technologies Shifts to Direct Sales of High-Performance Products in North America March 3rd, 2015

Forbidden quantum leaps possible with high-res spectroscopy March 2nd, 2015

International research partnership tricks the light fantastic March 2nd, 2015

Important step towards quantum computing: Metals at atomic scale March 2nd, 2015

Photonics/Optics/Lasers

Black phosphorus is new 'wonder material' for improving optical communication March 3rd, 2015

Breakthrough in OLED technology March 2nd, 2015

International research partnership tricks the light fantastic March 2nd, 2015

Imec Demonstrates Compact Wavelength-Division Multiplexing CMOS Silicon Photonics Transceiver March 1st, 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







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE