Your Obedient Serpent (athelind) wrote,
Your Obedient Serpent

  • Mood:
  • Music:

"Ensign Crusher! Activate the PLASMONIC SHIELD!!"

Engineers Devise Invisibility Shield
Electron effects could stop objects from scattering light.

The key to the concept is to reduce light scattering. We see objects because light bounces off them; if this scattering of light could be prevented (and if the objects didn't absorb any light) they would become invisible. Alù and Engheta's plasmonic screen suppresses scattering by resonating in tune with the illuminating light.

Plasmons are waves of electron density, caused when the electrons on the surface of a metallic material move in rhythm. The researchers say that a shell of plasmonic material will scatter light negligibly if the light's frequency is close to the resonant frequency of the plasmons. The scattering from the shell effectively cancels out the scattering from the object.

For visible-light shielding, says Engheta, nature has already provided suitable plasmonic materials: silver and gold. To reduce the scattering of longer-wavelength radiation such as microwaves, one could make the shield from a 'metamaterial': a large-scale structure with unusual electromagnetic properties, typically constructed from arrays of wire loops and coils.

Alù and Engheta's calculations show that spherical or cylindrical objects coated with such plasmonic shields do indeed produce very little light scattering. It is as though, when lit by light of the right wavelength, the objects become extremely small, so small that they cannot be seen.

My gods! A "plasmonic screen"?? How can you not love a name like that? That is so going in my next SF game.

  • In Which Your Obedient Serpend SHUTS THE TWEET UP

    I have disabled the Twitter Aggregate Post Function on LiveJournal. It has done nothing but spam my archive and make it impossible for me to find…

  • My tweets

    Tue, 12:17: RT @ WIRED: Patch your Chrysler now against a wireless hacking attack Tue, 12:17: RT @ karldegre:…

  • My tweets

    Mon, 14:06: RT @ usclimateplan: California's #climate goals could catapult the state economy forward while setting new global standards.…

  • Post a new comment


    Anonymous comments are disabled in this journal

    default userpic

    Your reply will be screened

    Your IP address will be recorded