Subscribe free to our newsletters via your
. 24/7 Space News .




Subscribe free to our newsletters via your




















CHIP TECH
Ultrafast tunable semiconductor metamaterial created
by Staff Writers
Moscow, Russia (SPX) May 23, 2017


A semiconductor-based metamaterial tuned by ultrashort laser pulses. Credit Maxim Shcherbakov

An international team of researchers from Moscow State University (Russia), Sandia National Laboratories in Albuquerque (USA), and Friedrich-Schiller University in Jena (Germany) have devised an ultrafast tunable metamaterial based on gallium arsenide nanoparticles, as published by Nature Communications. The new optical metamaterial paves the way to ultrafast information transfer on the nanoscale.

Optical metamaterials are man-made media that acquire unusual optical properties due to nanostructuring. For almost twenty years, researchers have been able to design a plethora of metamaterial-based devices, from those hiding objects to those sensitive to minute concentrations of substances.

However, upon fabrication, metamaterial properties remain fixed. The team of physicists and engineers came up with a way to turn metamaterials "on" and "off," and do it very quickly - more than 100 billion times per second.

Researchers fabricated the metamaterial from a thin gallium arsenide film by electron-beam lithography with subsequent plasma etching. The material consists of an array of semiconductor nanoparticles, which can resonantly concentrate and "hold" light on the nanoscale. In other words, when the light illuminates the metamaterial, it is "trapped" inside the nanoparticles and interacts more efficiently with them.

The working principle of the ultrafast tunable metamaterial lies in generation of electron-hole pairs. In the steady state, the metamaterial is reflective.

Then, researchers illuminate the metamaterial with an ultrashort laser pulse, whose energy is used to generate electrons and electron vacancies - "holes" - in the material. The presence of electrons and holes changes the properties of the material: now, the metamaterial is not reflective anymore.

In a split second, electrons and holes disappear by meeting each other, and the metamaterial is reflective again. This way, it is possible to construct optical logic elements and, in the end of the day, opens the possibility of creating ultrafast optical computers.

In 2015, a part of the same collaboration reported a similar device based on silicon nanostructures. In their new study, gallium arsenide was used instead of silicon, which increased the efficiency of controlling light with light in metamaterials by an order of magnitude.

The work of researchers belongs to photonics, which studies light and ways of using it for various applications. For instance, in electronics signals are transmitted by electric currents, whereas in photonics, light quanta serve this purpose.

Prospectively, the research will allow creating devices for information transfer and processing at speeds of tens and hundreds of terabits per second. The demonstration of highly efficient tunable semiconductor metamaterials is a significant step towards such information processing speeds.

Research paper

CHIP TECH
Managing stress helps transistor performance
Washington DC (SPX) May 22, 2017
Tensile mechanical stress can have a useful effect for some transistors, where the resulting atomic strain allows its current-carrying electron-hole pairs better mobility. However, when that stress is applied to the whole device, as is a popular approach via use of what's called contact etching stop layers (CESLs), the drift region adjacent to the stretched channel is compressed and results in r ... read more

Related Links
Lomonosov Moscow State University
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

CHIP TECH
SoftBank-Saudi high-tech Vision fund raises $93bn

'Stone Age' Trump going back to horse and cart says Schwarzenegger

Saving time in space

SpaceX Dragon to deliver research payloads to Space Station

CHIP TECH
Mining the moon for rocket fuel to get us to Mars

Arianespace launches SES-15 using Soyuz rocket

ULS wins $208Mln for rocket vehicle production services

ISRO to Launch GSLV Mark III, Its Heaviest Rocket Soon

CHIP TECH
HI-SEAS Mission V Mars simulation marks midway point

Deciphering the fluid floorplan of a planet

How hard did it rain on Mars

Mars Rover Opportunity Begins Study of Valley's Origin

CHIP TECH
A cabin on the moon? China hones the lunar lifestyle

China tests 'Lunar Palace' as it eyes moon mission

China to conduct several manned space flights around 2020

Reach for the Stars: China Plans to Ramp Up Space Flight Activity

CHIP TECH
AsiaSat 9 ready for shipment

SES Networks offers new hybrid resiliency service

Allied Minds' portfolio company BridgeSat raises $6 million in Series A financing

AIA report outlines policies needed to boost the US Space Industry competitiveness

CHIP TECH
A new tool for discovering nanoporous materials

One-dimensional crystals for low-temperature thermoelectric cooling

New theory predicts wetted area of droplets colliding with flat surface

Physicists discover mechanism behind granular capillary effect

CHIP TECH
Scientists propose synestia, a new type of planetary object

Kepler Telescope Spies Details of Trappist-1's Outermost Planet

Astronomers Confirm Orbital Details of TRAPPIST-1h

Study shows how radioactive decay could support extraterrestrial life

CHIP TECH
Hubble spots moon around third largest dwarf planet

NASA asks science community for Europa Lander Instruments ideas

Waves of lava seen in Io's largest volcanic crater

Not So Great Anymore: Jupiter's Red Spot Shrinks to Smallest Size Ever




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement