Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

Home > Press > Unavoidable disorder used to build nanolaser

The nanolaser is based on the disorder in the pattern of holes in the photonic crystal. The light source is built into the photonic crystal itself, which is clear as glass and when the light hits a hole it is reflected and is channeled into the so-called waveguide, the crystal's middle lane. But the light is thrown back and forth in the photonic crystal and due to imperfections is intensified and spontaneously turns into laser light.

Credit: Quantum Photonics, Niels Bohr Institute
The nanolaser is based on the disorder in the pattern of holes in the photonic crystal. The light source is built into the photonic crystal itself, which is clear as glass and when the light hits a hole it is reflected and is channeled into the so-called waveguide, the crystal's middle lane. But the light is thrown back and forth in the photonic crystal and due to imperfections is intensified and spontaneously turns into laser light.

Credit: Quantum Photonics, Niels Bohr Institute

Abstract:
Researchers the world round are working to develop optical chips, where light can be controlled with nanostructures. These could be used for future circuits based on light (photons) instead of electron - that is photonics instead of electronics. But it has proved to be impossible to achieve perfect photonic nanostructures: they are inevitably a little bit imperfect. Now researchers at the Niels Bohr Institute in collaboration with DTU have discovered that imperfect nanostructures can offer entirely new functionalities. They have shown that imperfect optical chips can be used to produce 'nanolasers', which is an ultimately compact and energy-efficient light source. The results are published in the scientific journal Nature Nanotechnology.

Unavoidable disorder used to build nanolaser

Copenhagen, Denmark | Posted on March 25th, 2014

The researchers are working with extremely small photonic crystal membranes - the width of the membrane is 25 micrometer (1 micrometer is one thousandth of a millimeter), and the thickness is 340 nanometers (1 nanometer is one thousandth of a micrometer). The crystals are made of the semiconducting material gallium arsenide (GaAs). A pattern of holes are etched into the material at a regular distance of 380 nanometers. The holes have the function of acting as built-in mirrors that reflect the light and can thus be used to control the spread of the light in the optical chip. The researchers have therefore tried to achieve as perfect a regular structure of holes as possible to control the light in certain optical circuit.

Unavoidable disorder exploited

But in practice it is impossible to avoid small irregularities during the manufacture of the optical chips and this can be a big problem, as it can result in the loss of light and therefore reduced functionality. Researchers at the Niels Bohr Institute have now turned the problem of imperfections into an advantage.

"It turns out that the imperfect optical chips are extremely well suited for capturing light. When the light is sent into the imperfect chip, it will hit the many small irregular holes, which reflect the light in random directions. Due to the frequent reflections, the light is spontaneously captured in the nanostructure and cannot escape. This allows the light to be amplified, resulting in surprisingly good conditions for creating highly efficient and compact lasers," explains Peter Lodahl, professor and head of the Quantum Photonic research group at the Niels Bohr Institute at the University of Copenhagen.

Experiment with built-in light

The researchers in Quantum Photonics at the Niels Bohr Institute, led by Professor Peter Lodahl and Associate Professor Søren Stobbe, designed the photonic crystal and carried out the experimental studies in the research group's laboratories.

The light source is integrated into the photonic crystal itself and is comprised of a layer of artificial atoms that emit light (the basic component of light is photons). The photons are sent through the crystal, which is clear as glass and has a pattern of tiny holes. When a photon hits a hole it is reflected and channeled into the so-called waveguide, which is a 'photon track' that can be used to guide the photons through the photonic crystal. However, due to the imperfect holes the light will be thrown back and forth in the waveguide of the photonic crystal, intensifying it and turning it into laser light.

The result is laser light on a nanometer scale and the researchers see great potential in this.

The dream of a quantum Internet

"The fact that we can control the light and produce laser light on a nanometer scale can be used to create circuits based on photons instead of electrons, thus paving the way for optical quantum communication technology in the future. With built-in laser sources, we will be able to integrate optical components and it allows for the building of complex functionalities. Our ultimate dream is to build a 'quantum internet', where the informations is coded in individual photons," explain Peter Lodahl and Søren Stobbe, who are excited about the results, which show that the unavoidable disorder in optical chip is not a limitation and can even be exploited under the right conditions.

####

For more information, please click here

Contacts:
Gertie Skaarup

45-28-75-06-20

Peter Lodahl
Professor
Quantum Photonics
Niels Bohr Institute
University of Copenhagen
+45 2056-5303

http://www.quantum-photonics.dk

Søren Stobbe
Associate Professor
Quantum Photonics
Niels Bohr Institute
University of Copenhagen
+45 3532-5216

http://www.quantum-photonics.dk

Copyright © University of Copenhagen - Niels Bohr Institute

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

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Nanometrics Reports Second Quarter 2016 Financial Results July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

Display technology/LEDs/SS Lighting/OLEDs

Researchers develop faster, precise silica coating process for quantum dot nanorods July 12th, 2016

Integrated trio of 2-D nanomaterials unlocks graphene electronics applications: Voltage-controlled oscillator developed at UC Riverside could be used in thousands of applications from computers to wearable technologies July 7th, 2016

GraphExeter illuminates bright new future for flexible lighting devices June 23rd, 2016

New nanomaterial offers promise in bendable, wearable electronic devices: Electroplated polymer makes transparent, highly conductive, ultrathin film June 13th, 2016

Chip Technology

Nanometrics Reports Second Quarter 2016 Financial Results July 26th, 2016

Attosecond physics: Mapping electromagnetic waveforms July 25th, 2016

Borrowing from pastry chefs, engineers create nanolayered composites: Method to stack hundreds of nanoscale layers could open new vistas in materials science July 25th, 2016

Integration of novel materials with silicon chips makes new 'smart' devices possible July 25th, 2016

Optical computing/Photonic computing

Attosecond physics: Mapping electromagnetic waveforms July 25th, 2016

The birth of quantum holography: Making holograms of single light particles! July 21st, 2016

Researchers develop faster, precise silica coating process for quantum dot nanorods July 12th, 2016

A little impurity makes nanolasers shine: ANU media release July 6th, 2016

Discoveries

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

The NanoWizard® AFM from JPK is applied for interdisciplinary research at the University of South Australia for applications including smart wound healing and how plants can protect themselves from toxins July 26th, 2016

Announcements

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Nanometrics Reports Second Quarter 2016 Financial Results July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

New lithium-oxygen battery greatly improves energy efficiency, longevity: New chemistry could overcome key drawbacks of lithium-air batteries July 26th, 2016

Scientists test nanoparticle drug delivery in dogs with osteosarcoma July 26th, 2016

Ultrasensitive sensor using N-doped graphene July 26th, 2016

The NanoWizard® AFM from JPK is applied for interdisciplinary research at the University of South Australia for applications including smart wound healing and how plants can protect themselves from toxins July 26th, 2016

Photonics/Optics/Lasers

Attosecond physics: Mapping electromagnetic waveforms July 25th, 2016

RMIT researchers make leap in measuring quantum states July 21st, 2016

The birth of quantum holography: Making holograms of single light particles! July 21st, 2016

Graphene photodetectors: Thinking outside the 2-D box July 21st, 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