Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

QDs Form New Platform for Optical Logic

Photonics.com
Apr 2013
MONTREAL, April 10, 2013 — A new way of controlling light with quantum dots provides a platform for optical logic that could replace electronic transistors with optical ones.

As demand for computing and communication capacity surges, the global communication infrastructure struggles to keep pace: The light signals transmitted through fiber optic lines must still be processed electronically, creating bottlenecks in telecommunications networks.

To get around this problem, scientists have sought to develop optical transistors, but these devices have remained elusive despite years of experiments with various approaches.


McGill University researchers have shown that all-optical modulation and basic Boolean logical functionality can be achieved by using laser-pulse inputs to manipulate the quantum mechanical state of a semiconductor nanocrystal. These nanocrystals can form a completely new platform for optical logic, they said. Courtesy of McGill University.

Now McGill University researchers have made an important discovery that may help make optical transistors a reality. The investigators have shown that all-optical modulation and basic Boolean logical functionality — key steps in the processing and generation of signals — can be achieved using laser-pulse inputs to manipulate the quantum mechanical state of a semiconductor nanocrystal.

“Our findings show that these nanocrystals can form a completely new platform for optical logic,” said Jonathan Saari, a doctoral candidate in the chemistry department. “We’re still at the nascent stages, but this could mark a significant step toward optical transistors.”

Professor Patanjali Kambhampati’s group has found a new use for quantum dots — already used in applications such as photovoltaics, LEDs, lasers and bioimaging — based on the ability of these nanocrystals to modulate light in an optical gating scheme.

“These results demonstrate the proof of the concept,” Kambhampati said. “Now we are working to extend these results to integrated devices, and to generate more complex gates in hopes of making a true optical transistor.”

The findings build on previous research that revealed unobserved light-amplification properties unique to quantum dots. (See: Light Squeezed From QDs)

The research was published in Nano Letters (doi: 10.1021/nl3044053).  

For more information, visit: www.mcgill.ca


GLOSSARY
quantum dots
Also known as QDs. Nanocrystals of semiconductor materials that fluoresce when excited by external light sources, primarily in narrow visible and near-infrared regions; they are commonly used as alternatives to organic dyes.  
Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x We deliver – right to your inbox. Subscribe FREE to our newsletters.