Deutsch | English | Español | Français | Italiano | Português | Русский | العربية | 日本語 | 简体中文 | 繁體中文 | 한국의 | Türk | Polski
Global B2B portal for electronics and ICT industry
Product / Service Supplier Catalogs & Literature    
home Product News Catalogs Web TV News & Topics Featured Articles Trade Shows Sourcing Help My allitwares
Featured Articles Content
allitwares > Featured Articles > Tunable single-wavelength lasers for communication; nanotwinned copper; superconductors.

Tunable single-wavelength lasers for communication; nanotwinned copper; superconductors.
Author: David Lammers
Source From: Semiconductor Manufacturing & Design Community
Posted Date: 2012-05-09

On-Chip Photonics Advance

France’s III-V Lab said it has developed a tunable laser on silicon. The lab has been working on integrated photonic circuits which combine the active and passive functions of III-V- and silicon-based devices for telecommunications and data transfer.

The III-V lab, near Paris, is working towards fully integrated transceivers.

A joint lab of Alcatel-Lucent Bell Labs France, Thales Research and Technology, and CEA-Leti, the III-V lab said it has demonstrated single-wavelength tunable lasers with a 21mA threshold at 20°C, a 45nm tuning range and side mode suppression ratio larger than 40dB over the tuning range.

CEA-Leti and the III-V lab have been working to integrate on-chip devices, including a fully integrated transmitter working above 10Gb/s, as well as tunable single wavelength lasers. They represent key milestones towards fully integrated transceivers, said the III-V lab, which is located near Paris at two sites, Marcoussis and Palaiseau, and which includes about 100 permanent researchers and 25 PhD students.

ASTAR Simulates Nanotwinned Copper

Singapore’s A*STAR Institute for High Performance Computing has been simulating a form of copper known as nanotwinned copper, which may have semiconductor applications.

Using molecular dynamics simulations, the institute reported in a Science article that nanotwinned polycrystalline copper has been shown to possess “simultaneous ultra-high strength and ductility” with a maximum strength found at a small, finite twin spacing.

The simulations addressed questions arising from previous, unexplained experimental data which indicate that the crystal structure of nanotwinned copper exhibits many closely-spaced interruptions in an otherwise regular atomic array. “These interruptions, despite being termed ‘defects,’ actually increase the metal’s strength without reducing its ductility,” researcher Zhaoxuan Wu and co-workers reported.

Schematic illustrations of the (a) crystallographic orientation between nanotwins and (b) slip systems for nanotwinned grains. (Source: ASTAR)

In 2009, the researchers had observed that the strength of nanotwinned copper reached a maximum when the size of the defects in its crystal structure was about 15 nanometers. When the defects were made smaller or larger, the copper’s strength decreased. This contradicted the classical model, which predicted that the metal’s strength would increase continually as the defect size was reduced.

Wu and co-workers addressed this contradiction by using a very large-scale molecular dynamics simulation to calculate how a nanotwinned copper crystal consisting of more than 60 million atoms deforms under pressure.

Cornell Studies Iron-based Superconductors

Cornell researchers have confirmed some predictions about how iron-based high-temperature superconductors work. According to an article in the British publication, The Engineer, various research teams have discovered compounds of iron, arsenic and other elements which become superconductors at much higher temperatures. Early superconductor research focused on metals cooled to near absolute zero.

The Cornell University team studied electrons that have paired up with twins from adjacent atoms to form ‘Cooper pairs’ that move through the conductor without interference. “It is believed that Cooper pairs form when two electrons with opposite spins join up, analogous to two bar magnets snapping together with their north and south poles meeting,” the article in the U.K. publication said.

Anisotropic energy gaps of LiFeAs superconductors. (Source: Cornell University)

Studying crystals of a compound of lithium, iron and arsenic − LiFeAs − that becomes a superconductor at 15K, the Cornell researchers found three of the five possible electron bands.

‘There are two more pairing gaps that we should have been able to detect, and we don’t know yet why not,’ said team leader Séamus Davis of Cornell University. ‘But finding these three along with the directionality is enough to strongly support the theory, and the measurements give the theorists numbers to plug in to refine and extend their predictions.’

An article on the research appeared in Science magazine, saying that the lab’s measurements “will advance the quantitative theoretical analysis of the mechanism of Cooper pairing in iron-based superconductivity.”


Original Hyperlink:

For more information from this magazine/website? Please click here

Note: The copyright and the ownship of the brand, product names, product numbers, and content mentioned belongs to their repective companies.

comments powered by Disqus
Latest News

This Is What Industry 4.0 Looks Like in 2025

Industry 4.0: The Age of the Machines

8 tips to help you avoid traffic jams

What You Must Know About Software and Robotics Operations

Four Ways to Collect Process Plant Data

Related Catalogs
Featured Pages
5 Axis Machining CenterActuatorsAir ToolsAll-in-One Computers
Aluminum ExtrusionsAntennaAudio Power AmplifierAutomatic Coil Winding Machine
Brushless DC MotorsCable AssembliesCapacitorsCar Drive Recorders
CCTV CameraCircuit BreakersCircular ConnectorsClamp Meters
CNC EDMCNC Precision Machining PartsComputer CaseComputer Cooling Fan
Control ValvesCPU Heat SinksCrystal OscillatorsCustom PCB Manufacture
CylindersD-subminiature ConnectorsData Acquisition BoardDC/DC Converters
Die CastingDigital SignageDimmers and Lighting ControlsEarphone and Headset
Electromagnetic Clutch and BrakeEthernet I/O ModulesFanless Embedded ComputerFlash Memory Device
Gear ReducerGlobal Position SystemGrinding CenterHeating Element
IC SocketsInductorIndustrial Ethernet SwitchesIndustrial Robot
Injection MoldingiPhone/iPad AccessoriesKeyboard & KeypadKVM Switch
LCD ModulesLead FramesLED Driver ICsLED Lights
Machining CenterMetal EnclosuresMetal Stamping MoldsMicroprocessor
Open Frame MonitorOscilloscopesPCB EquipmentPlastic Films
Plastic Housing and PartsPLCsPOS SystemsPower Adapter
Power SupplyPower ToolsRAID ServersRelays
ResistorRF Microwave ConnectorsRFID DevicesSecurity Intercom Systems
ServerServo MotorSingle Board ComputerSmart Phone
SolenoidsSwitching HubTablet PCsTouch Panel Computer
UPSVoIP Gateway and PhoneWireless Networking 
· Home
· Product News
· Catalogs
· Web TV
· News & Topics
· Features Articles
· Trade Show
· Sourcing Help
· My Allitwares
Special Zone
· Directory
· Trade Show Supplement
2014 Hannover
· About Us
· Promote Your Business
· Advertise
· Partner with Us
· Press Release
· Contact Us
· Term of Use
· Privacy Policy
· Starter Program
· Sitemap
B2B Web Portal Alliance
Buy Engineer Sample Kits
OEM Sourcing
· Deutsch
· English
· Español
· Français
· Italiano
· Português
· Русский
· العربية
· 日本語
· 简体中文
· 繁體中文
· 한국의
· Türk
· Polski

Copyrights © 2012 Allitwares Corporation All Rights Reserved. is a Division of Allitwares Corporation is a B2B Trade Portal | B2B Web Portal |B2B Marketplace for Electronics and ICT Industry