Navigation Links
Needle beam could eliminate signal loss in on-chip optics
Date:9/7/2012

Cambridge, Mass. September 7, 2012 - An international, Harvard-led team of researchers have demonstrated a new type of light beam that propagates without spreading outwards, remaining very narrow and controlled along an unprecedented distance. This "needle beam," as the team calls it, could greatly reduce signal loss for on-chip optical systems and may eventually assist the development of a more powerful class of microprocessors.

Based at the Harvard School of Engineering and Applied Sciences (SEAS) and the Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS, in France, the applied physicists both characterized and created this needle beam, which travels efficiently at the interface of gold and air. Their findings were published online August 31 in the journal Physical Review Letters.

The needle beam arises from a special class of quasiparticles called surface plasmons, which travel in tight confinement with a metal surface. The metallic stripes that carry these surface plasmons have the potential to replace standard copper electrical interconnects in microprocessors, enabling ultrafast on-chip communications.

One of the fundamental problems that has so far hindered the development of such optical interconnects is the fact that all waves naturally spread laterally during propagation, a phenomenon known as diffraction. This reduces the portion of the signal that can actually be detected.

"We have made a major step toward solving this problem by discovering and experimentally confirming the existence of a previously overlooked solution of Maxwell's equations that govern all light phenomena," says principal investigator Federico Capasso, Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering at SEAS. "The solution is a highly localized surface plasmon wave that propagates for a long distance, approximately 80 microns in our experiments, in a straight line without any diffraction."

The so-called needle beam, the technical term for which is a cosine-Gauss plasmon beam, propagates in tight confinement with a nanostructured metal surface. Lead author Jiao Lin, a visiting postdoctoral fellow at SEAS from the Singapore Institute of Manufacturing and Technology, and coauthor Patrice Genevet, a research associate in Capasso's group, found an ingenious way to demonstrate the theorized phenomenon. They sculpted two sets of grooves into a gold film that was plated onto the surface of a glass sheet. These tiny grooves intersect at an angle to form a metallic grating. When illuminated by a laser, the device launches two tilted, plane surface waves which interfere constructively to create the non-diffracting beam.

"Our French colleagues did a beautiful experiment, using an ultrahigh-resolution microscope to image the needle-shaped beam propagating for a long distance across the gold surface," says Genevet.

Capasso's team hopes the finding will assist the development of more energy-efficient and powerful microprocessors.


'/>"/>

Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Source:Eurekalert  

Related biology technology :

1. NxStage Extends Agreement to Supply Streamline Bloodlines, MasterGuard and Buttonhole Needle Technology to B. Braun
2. Breaking Study: ICU Medicals Tego® Needlefree Connector Proves More Cost Effective Than Traditional Central Venous Catheter Locks
3. Protein that helps tumor blood vessels mature could make cancer drugs more effective
4. Botanical compound could prove crucial to healing influenza
5. Gold nanoparticles could treat prostate cancer with fewer side effects than chemotherapy
6. Draper Device Could Help Pave Way Towards “Kidney-On-A-Chip” Development
7. Penn researchers study of phase change materials could lead to better computer memory
8. Research could lead to new drugs for major diseases
9. New twist on old chemical process could boost energy efficiency
10. Armored caterpillar could inspire new body armor
11. Nanocable could be big boon for energy storage
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Needle beam could eliminate signal loss in on-chip optics
(Date:1/19/2017)... ... January 19, 2017 , ... ... development (R&D), today announced the launch of Data Science Services , ... rapidly evolving field of precision medicine. , Data Science Services allows ...
(Date:1/19/2017)... ... January 18, 2017 , ... The ... (NIH) to update its Data Sharing Policy. Specifically, the nation’s leading informatics experts, ... subject to the existing policy. AMIA recommended that NIH earmark funding for researchers ...
(Date:1/19/2017)... 2017  Northwest Biotherapeutics, Inc. (OTCQB: NWBO) ("NW Bio"), ... for operable and inoperable solid tumor cancers, announced today ... of NW Bio, will present at the Phacilitate Immunotherapy ... Hyatt Regency Hotel in Miami, Florida ... entitled "New Therapeutic Approaches – Expanding the Reach of ...
(Date:1/18/2017)... CAMBRIDGE, Mass. , Jan. 18, 2017   ... of novel compounds designed to target cancer stemness pathways, ... lead investigational compound, napabucasin, at the 2017 ASCO Gastrointestinal ... San Francisco . Napabucasin is ... pathways by targeting STAT3. i Cancer stem cells ...
Breaking Biology Technology:
(Date:1/4/2017)...  For the thousands of attendees at this year,s International Consumer Electronics ... and biometric measurement devices and services, will be featuring its new line ... A&D Medical,s special CES Exhibit Suite , the new upper arm ... company,s WellnessConnected product platform.  ... ...
(Date:12/22/2016)... 20, 2016  As part of its longstanding mission to ... genetics company, recently released its latest children,s book, titled ... focuses on the topics of inheritance and variation of traits ... taught in elementary school classrooms in the US. ... illustrator Ariana Killoran , whose previous book with 23andMe, ...
(Date:12/20/2016)... 20, 2016   Valencell , the leading ... STMicroelectronics (NYSE: STM), a global semiconductor leader ... announced today the launch of a new, highly ... that includes ST,s compact SensorTile turnkey ... biometric sensor system. Together, SensorTile and Benchmark deliver ...
Breaking Biology News(10 mins):