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People say we're running out of energy. That's only true if we stick with these old 19th century technologies. We are awash in energy from sunlight.

 

Ray Kurzweil

 

Metamaterial for Gecko toes

RATE THIS! +1
Posted in Science on 18th Jan, 2012 08:43 PM by APM

On the mesoscopic scale, electromagnetic forces are of fundamental importance to an enormously diverse range of systems, from optical tweezers to the adhesion of gecko toes. Here we show that a strong light-driven force may be generated when a plasmonic metamaterial is illuminated in close proximity to a dielectric or metal surface. This near-field force can exceed radiation pressure and Casimir forces to provide an optically controlled adhesion mechanism mimicking the gecko toe: at illumination intensities of just a (few tens of nW) divided by (μm^2) it is sufficient to overcome the Earth’s gravitational pull.

 


Zhang and co point out some applications. The say, for example, that an optical scanning tip covered with a metamaterial could be used to pick up and place nano-objects or that metmaterials suspended near the surface of a metal could be tuned with incident light to dramatically change the broadband reflectance of the material.

 

Technologyu Review - There's no end of interesting applications. These guys even tease their readers with images of a gecko's toes implying that some kind of spiderman-like adhesion may be possible too.

 


The only outstanding problem is to find this force. Zhang and co clearly outline the conditions under which it ought to be measurable and say: "The near-field electromagnetic force described here should be easy to detect."

 

So it should only be a matter of weeks or months before they reveal the first evidence of it.



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Comments

Author: Guest
Posted: 2015-09-18
+0
Sakshi News Paper and Sakshi News Channel. Sakshi Its Word From Bible Exmples Saksham Cheppu,Sakshi vi. Indirectly its now reached to Tirumala as Bible a Pamplet and slolwy started poluting our Dharma Indirectly Bro Anil Kumar entered as leaf of Sakshi in Tirumala lets protect dharma from this Dramatic people Reply
Author: Guest
Posted: 2016-05-07
+0
Arltcies like this are an example of quick, helpful answers. Reply


 

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