Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Sound gives nanocavity a twist

Abstract:
Researchers from Augsburg, Munich and Santa Barbara (California) successfully combined the worlds of nanophotonics and nanomechanical systems. The scientists work for the cluster of excellence Nanosystems Initiative Munich (NIM), the Center for Nanoscience (CeNS), the Augsburg Center for Innovative Technologies (ACIT) and for the California NanoSystems Institute (CNSI) at Santa Barbara.

Sound gives nanocavity a twist

Munich, Germany and Santa Barbara, CA | Posted on October 21st, 2011

NIM graduate student Daniel Fuhrmann and his supervisor Hubert Krenner demonstrate in the latest issue of Nature Photonics that a sound wave can be used to control a photonic crystal. Quantum effects within the crystal lead to an fast and very efficient generation and modulation of single photons, the quanta of light. Hubert Krenner recently established a prestigious Emmy Noether Junior Research Group at the Chair of Achim Wixforth at Augsburg University.

For their experiments the team fabricated a freestanding nanomembrane of semiconducting material. Into the membrane they drilled a large periodic array of tiny holes using cleanroom nanofabrication. In this structure, a photonic crystal, they trapped light of a well-defined wavelength or color inside a region where they skipped three holes. As light emitters they placed so-called quantum dots inside of this nanocavity. These quantum dots are often called artificial atoms because they - just like real atoms - emit light at sharp spectral lines and as single quanta (photons).

Until now the key challenge in this system was to overlap the wavelength of the light trapped in the nanocavity and the light emitted by the quantum dot. When the two wavelengths are in resonance the quantum mechanical Purcell effect leads to a dramatic increase of the light extraction efficiency. The NIM-CNSI research team solved this problem very elegantly: the scientists used a nanoquake, so-called surface acoustic waves. These waves periodically stretch and compress the thin membrane and its precisely ordered array of holes. The nanoquakes deform the photonic crystal at radio frequency and the wavelength of the light inside the nanocavity oscillates back and forth in less than a third of a nanosecond. This is more than ten times faster than any other approach worldwide.

NIM-graduate student Daniel Fuhrmann is excited about the success of his experiments: "The idea of an acoustically modulated photonic crystal existed in our lab for quite a long time. After all the hard work it made me really proud to actually see the wavelength of the nanocavity oscillating with the shaking of the nanoquake. I am also very happy that we again have shown that surface acoustic waves, our special tool in Augsburg, lead to surprising results and outstanding research also in the field of nanophotonics"

The Augsburg group is renowned for their pioneering work and application of surface acoustic waves. They apply these to various types of nanosystems ranging from biological and biophysical systems over microfluidics to fundamental physical effect such as the Quantum Hall Effect. All these experiments have attracted large attention worldwide and built the outstanding reputation of their research using their nanoquakes on a chip.

The experiment by Daniel Fuhrmann and his colleagues from Bavaria and California is an excellent example for a successful international collaboration between the two high-tech states on both sides of the Atlantic Ocean. Hubert Krenner and Achim Wixforth both spent a long time at UC Santa Barbara and frequently visit their Californian colleagues. The project was seed-funded by the Bavarian-Californian Technology Center (BaCaTeC) and carried out supported by NIM within a PhD student scholarship of the Bayerische Forschungsstiftung (BFS).

Based on these groundbreaking experiments researchers expect that a highly efficient, acoustically triggered "single photon source" will be realized. Such a device is crucially required for inherently secure quantum-cryptography and the optical quantum computer.

####

For more information, please click here

Contacts:
Dr. Birgit Gebauer
Outreach Manager
Nanosystems Initiative Munich
Schellingstraße 4
80799 München, Germany
Phone: +49 (89) 2180 5091
Fax: +49 (89) 2180 5649
birgit.gebauer(at)lmu.de

Copyright © Nanosystems Initiative Munich

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

Paper: D. A. Fuhrmann, Susanna M. Thon, H. Kim, D. Bouwmeester, P. M. Petroff, A. Wixforth, H. J. Krenner, Nature Photonics 5, 605–609 (2011). doi:10.1038/nphoton.2011.208

Related News Press

News and information

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Quantum Computing

Nanoscale cavity strongly links quantum particles: Single photons can quickly modify individual electrons embedded in a semiconductor chip and vice versa February 8th, 2016

Chiral magnetic effect generates quantum current: Separating left- and right-handed particles in a semi-metallic material produces anomalously high conductivity February 8th, 2016

New invention revolutionizes heat transport February 1st, 2016

A new quantum approach to big data January 25th, 2016

Optical computing/ Photonic computing

Silicon chip with integrated laser: Light from a nanowire: Nanolaser for information technology February 12th, 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

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

Silicon-based metamaterials could bring photonic circuits February 1st, 2016

Discoveries

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Announcements

Graphene leans on glass to advance electronics: Scientists' use of common glass to optimize graphene's electronic properties could improve technologies from flat screens to solar cells February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Photonics/Optics/Lasers

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Silicon chip with integrated laser: Light from a nanowire: Nanolaser for information technology February 12th, 2016

Scientists take nanoparticle snapshots February 10th, 2016

Scientists create laser-activated superconductor February 8th, 2016

Research partnerships

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Research reveals carbon films can give microchips energy storage capability: International team from Drexel University and Paul Sabatier University reveals versatility of carbon films February 11th, 2016

SLAC X-ray laser turns crystal imperfections into better images of important biomolecules: New method could remove major obstacles to studying structures of complex biological machines February 11th, 2016

Quantum nanoscience

Nanoscale cavity strongly links quantum particles: Single photons can quickly modify individual electrons embedded in a semiconductor chip and vice versa February 8th, 2016

The iron stepping stones to better wearable tech without semiconductors February 8th, 2016

Spin dynamics in an atomically thin semi-conductor February 1st, 2016

New record in nanoelectronics at ultralow temperatures January 28th, 2016

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