Navigation Links
Stanford engineers use nanophotonics to reshape on-chip computer data transmission
Date:11/15/2011

A team at Stanford's School of Engineering has demonstrated an ultrafast nanoscale light emitting diode (LED) that is orders of magnitude lower in power consumption than today's laser-based systems and able to transmit data at 10 billion bits per second. The researchers say it is a major step forward in providing a practical ultrafast, low-power light sources for on-chip computer data transmission.

Stanford's Jelena Vuckovic, an associate professor of electrical engineering and the study's senior author, and first author Gary Shambat, a doctoral candidate in electrical engineering, announced their device in paper to be published November 15 in the journal Nature Communications.

Vuckovic had earlier this year produced a nanoscale laser that was similarly efficient and fast, but that device operated only at temperatures below 150 Kelvin, about 190 degrees below zero Fahrenheit, making them impractical for commercial use. The new device operates at room temperature and could, therefore, represent an important step toward next-generation computer processors.

"Low-power, electrically controlled light sources are vital for next generation optical systems to meet the growing energy demands of the computer industry," said Vuckovic. "This moves us in that direction significantly."

Single-Mode Light

The LED in question is a "single-mode LED," a special type of diode that emits light more or less at a single wavelength, very similar to a laser.

"Traditionally, engineers have thought only lasers can communicate at high data rates and ultralow power," said Shambat. "Our nanophotonic, single-mode LED can perform all the same tasks as lasers, but at much lower power."

Nanophotonics is key to the technology. In the heart of their device, the engineers have inserted little islands of the material indium arsenide, which, when pulsed with electricity, produce light. These islands are surrounded by photonic crystal an array of tiny holes etched in a semiconductor. The photonic crystal serves as a mirror that bounces the light toward the center of the device, confining it inside the LED and forcing it to resonate at a single frequency.

"In other words, the light becomes single-mode," said Shambat.

"Without these nanophotonic ingredients the 'quantum dots' and the photonic crystal it is impossible to make an LED efficient, single-mode and fast all at the same time," said Vuckovic.

Engineering Ingenuity

The new device includes a bit of engineering ingenuity, too. Existing devices are actually two devices, a laser coupled with an external modulator. Both devices require electricity. Vuckovic's diode combines light emission and modulation functions into one device that drastically reduces energy consumption.

On average, the new LED device transmits data at 0.25 femto-Joules per bit of data. By comparison, today's typical 'low' power laser device requires about 500 femto-Joules to transmit a single bit. Some technologies consume as much as one pico-Joule per bit.

"Our device is 2000 to 4000 times more energy efficient than best devices in use today" said Vuckovic.

Stanford Professor James Harris, former PhD student Bryan Ellis, and doctoral candidates Arka Majumdar, Jan Petykiewicz and Tomas Sarmiento also contributed to this research.


'/>"/>

Contact: Andrew Myers
admyers@stanford.edu
650-736-2241
Stanford School of Engineering
Source:Eurekalert  

Related biology technology :

1. Stanford engineers create nanoscale nonlinear light source
2. Stanford and SanBio Announce a Clinical Trial of Cell Therapy for Stroke Disability
3. Stanford researchers use river water and salty ocean water to generate electricity
4. Auxogyn Licenses Non-invasive Embryo Assessment Technology From Stanford University
5. Univfy and Stanford Scientists Develop the First Personalized Prognostic Test to Predict Live Birth Outcomes with In Vitro Fertilization
6. Stanford scientists develop new way to grow adult stem cells in culture
7. New technique reinforces immune cells that seek and destroy cancer, says Stanford researcher
8. LASIK Expert Edward Manche, M.D., of the Stanford Eye Laser Center Joins Top Surgeons Listed at the Trusted LASIK Surgeons Directory
9. Eiger BioPharmaceuticals Acquires Exclusive License to Novel Hepatitis C Virus (HCV) Technology From Stanford University
10. Stanford researchers find a quicker, cheaper way to sort isotopes
11. Kornberg Associates Architects Selected to Develop Design for New Stanford University Imaging Center
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Stanford engineers use nanophotonics to reshape on-chip computer data transmission
(Date:2/5/2016)... 5, 2016 Australian-US drug discovery and development company, ... appointment of a new Chairman, Mr John O,Connor , ... immediately. James Garner , has also been ... former Acting CEO, Mr Iain Ross , will resume ... --> James Garner , has also been formally appointed ...
(Date:2/4/2016)... ... February 04, 2016 , ... Shimadzu Scientific Instruments will showcase ... demos and poster sessions, and present on the analysis of mycotoxins and medical ... 6 to 10 at the Georgia World Congress Center in Atlanta, Georgia. ...
(Date:2/4/2016)... PARK, Calif. , Feb. 4, 2016   DelMar ... biopharmaceutical company focused on the development and commercialization of new ... 18 th Annual BIO CEO & Investor Conference ... in New York, NY . ... an update on the ongoing clinical trial of VAL-083 ...
(Date:2/4/2016)... , Feb. 4, 2016 Sinovac Biotech Ltd. ... leading provider of biopharmaceutical products in China ... its board of directors received on February 4, 2016 ... from a consortium comprised of PKU V-Ming ( ... Co., Ltd., CICC Qianhai Development ( Shenzhen ...
Breaking Biology Technology:
(Date:1/25/2016)... , Jan. 25, 2016  Glencoe Software, the world-leading ... and publication industries, will provide the data management solution ... (NPSC). ... Phenotypic analysis measures the ... organisms, allowing comparisons between states such as health and ...
(Date:1/20/2016)...   MedNet Solutions , an innovative SaaS-based eClinical ... research, is pleased to announce the attainment of record-setting ... result of the company,s laser focus on (and growing ... it,s comprehensive, easy-to-use and highly affordable cloud-based technology platform. ... MedNet growth achievements in 2015 include: , ...
(Date:1/13/2016)... , January 13, 2016 ... the addition of the  "India Biometrics ... & Forecast (2015-2020)"  report to ... ) has announced the addition of ... Market - Estimation & Forecast (2015-2020)" ...
Breaking Biology News(10 mins):