Needle Beam Propagates Without Spreading

A new type of light beam called a "needle beam" has been discovered by Harvard-led researchers. The needle beam apparently propagates without spreading outward, moving along a specially-prepared surface.


(Federico Capasso (left) and Patrice Genevet demo 'needle beam' tech)

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...

The idea of a form of electromagnetic communication that does not spread out is mentioned by EE 'Doc' Smith in his 1930 novel Skylark Three (see the article on tight-beam communication).

However, a closer match is probably the similarly-named needlecast from Richard Morgan's 2003 novel Altered Carbon:

"...How regular is the update?”

Bancroft smiled. "Every 48 hours." He tapped the back of his neck. "Direct needlecast from here into a shielded stack over at the PsychaSec installation at Alcatraz."

Via Harvard.

Scroll down for more stories in the same category. (Story submitted 9/8/2012)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 0 )

Related News Stories - (" Communications ")

Researchers Make You Say Anything in Videos
'[It] caused his televised image... to mouth the vowels and consonants beautifully.' - Ray Bradbury, 1953.

Face2Face Is Bradbury's Spot-Wavex Scrambler
'A special spot-wavex scrambler also caused his televised image... to mouth the vowels and consonants beautifully.' - Ray Bradbury, 1953.

Tony Stark's Transparent Phone Possible With Graphene?
A nearly unbreakable smartphone - based on graphene.

Needle Beam Propagates Without Spreading
'Direct needlecast from here into a shielded stack...'

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

Zephyr Solar-Electric Stratospheric Drone
'The planes flew continuously, twenty-four hours a day...'

Robot Hummingbird Hovers Biomimetically
'With a buzz... it started out on its journey.'

Harvest Water From Air With Sunlight
'The atmosphere yielded its moisture with reluctance.'

Capitalist Big Brother Co-Opts Regular Big Brother
'It was even conceivable that they watched everybody all the time.'

A Floating Cosmodrome
'...a single perfectly level platform, which rose so high above the water that it was not splashed by the waves.'

First Artificial Memory Formed In Animals
'Is an extra-factual memory that convincing?' Quail asked.

Maintain Your Megastructure
Megastructures have repair robots, which have repair robots, ad infinitum.

Venezuelans Teaching Your Self-Driving Car
‘She wouldn't stop until Antar had told her everything he knew...’

Robothread Robotic Worms Crawling Through Your Brain
Perfect for clot-busting in the human brain. No Raquel Welch and no lasers, though.

Vantablack BMW X6 Is Douglas Adams Approved
'It's so... black!' said Ford Prefect.

Humanoid Robot's Muscles Biomimic Ours
'It is remarkable that the long leverages of their machines are in most cases actuated by a sort of sham musculature...'

Animatronic Robotic Baby Exposed
'The birth of Machine, my robot child...'

Beijing HaiDiLao Robotic Hotpot Restaurant Now Flavored By Artificial Intelligence
'Kantos Kan led me to one of these gorgeous eating places where we were served entirely by mechanical apparatus.'

Plants of the Future - What Should They Be Like
'He almost choked in his astonishment. Mashed potatoes and brown gravy!'

China Deploys Robot Traffic Police
'The robot came up smooth and fast as a rocket...'

Better Than Dune Chromoplastic? This Guy Might Have Done It
'But when Old Father Sun departs, the chromoplastic reverts to transparency in the dark.'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.