Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

Home > Press > Penn Researchers Make First All-optical Nanowire Switch

Laser light is emitted from the end of a cadmium sulfide nanowire.
Laser light is emitted from the end of a cadmium sulfide nanowire.

Abstract:
Computers may be getting faster every year, but those advances in computer speed could be dwarfed if their 1's and 0's were represented by bursts of light, instead of electricity.

Penn Researchers Make First All-optical Nanowire Switch

Philadelphia, PA | Posted on September 10th, 2012

Researchers at the University of Pennsylvania have made an important advance in this frontier of photonics, fashioning the first all-optical photonic switch out of cadmium sulfide nanowires. Moreover, they combined these photonic switches into a logic gate, a fundamental component of computer chips that process information.

The research was conducted by associate professor Ritesh Agarwal and graduate student Brian Piccione of the Department of Materials Science and Engineering in Penn's School of Engineering and Applied Science. Post-doctoral fellows Chang-Hee Cho and Lambert van Vugt, also of the Materials Science Department, contributed to the study.

It was published in the journal Nature Nanotechnology.

The research team's innovation built upon their earlier research, which showed that their cadmium sulfide nanowires exhibited extremely strong light-matter coupling, making them especially efficient at manipulating light. This quality is crucial for the development of nanoscale photonic circuits, as existing mechanisms for controlling the flow of light are bulkier and require more energy than their electronic analogs.

"The biggest challenge for photonic structures on the nanoscale is getting the light in, manipulating it once it's there and then getting it out," Agarwal said. "Our major innovation was how we solved the first problem, in that it allowed us to use the nanowires themselves for an on-chip light source."

The research team began by precisely cutting a gap into a nanowire. They then pumped enough energy into the first nanowire segment that it began to emit laser light from its end and through the gap. Because the researchers started with a single nanowire, the two segment ends were perfectly matched, allowing the second segment to efficiently absorb and transmit the light down its length.

"Once we have the light in the second segment, we shine another light through the structure and turn off what is being transported through that wire," Agarwal said. "That's what makes it a switch."

The researchers were able to measure the intensity of the light coming out of the end of the second nanowire and to show that the switch could effectively represent the binary states used in logic devices.

"Putting switches together lets you make logic gates, and assembling logic gates allows you to do computation," Piccione said. "We used these optical switches to construct a NAND gate, which is a fundamental building block of modern computer processing."

A NAND gate, which stands for "not and," returns a "0" output when all its inputs are "1." It was constructed by the researchers by combining two nanowire switches into a Y-shaped configuration. NAND gates are important for computation because they are "functionally complete," which means that, when put in the right sequence, they can do any kind of logical operation and thus form the basis for general-purpose computer processors.

"We see a future where ‘consumer electronics' become ‘consumer photonics'," Agarwal said. "And this study shows that is possible."

The research was supported by the U.S. Army Research Office and the National Institutes of Health's New Innovator Award Program.

####

For more information, please click here

Contacts:
Evan Lerner

215-573-6604

Copyright © University of Pennsylvania

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

Govt.-Legislation/Regulation/Funding/Policy

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

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

Military

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

Ultra-flat circuits will have unique properties: Rice University lab studies 2-D hybrids to see how they differ from common electronics 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

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