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Invisibility Shields Planned By Engineers

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  • Light Eye
    Dear Friends, http://news.nationalgeographic.com/news/2005/02/0228_050228_invisibility.html Love and Light. David Invisibility Shields Planned by Engineers
    Message 1 of 2 , Mar 1, 2005
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      Dear Friends,

      http://news.nationalgeographic.com/news/2005/02/0228_050228_invisibility.html

      Love and Light.

      David


      Invisibility Shields Planned by Engineers
      James Owen in London
      for National Geographic News

      February 28, 2005

      In popular science fiction, the power of invisibility is readily apparent. Star Trek fans, for example, know that the devious Romulans could make their spaceships suddenly disappear.
      But is the idea really so implausible? Not according to new findings by scientists who say they have come up with a way to create cloaking device.



      Electronic engineers at the University of Pennsylvania in Philadelphia are researching a device they say could make objects "nearly invisible to an observer." The contrivance works by preventing light from bouncing off the surface of an object, causing the object to appear so small it all but disappears.
      The concept was reported today by the science news Web site news@.... It says the proposed cloaking device would not require any peripheral attachments (such as antennas or computer networks) and would reduce visibility no matter what angle an object is viewed at.
      Sir John Pendry, a physicist at Imperial College, London, said the concept potentially holds several important applications "in stealth technology and camouflage."
      While types of invisibility shielding have been developed before, the phenomenon described by Andrea Alú and Nader Engheta sounds like something that might have been witnessed from the bridge of science fiction's starship Enterprise.
      The concept is based on a "plasmonic cover," which is a means to prevent light from scattering. (It is light bouncing off an object that makes it visible to an observer).
      The cover would stop light from scattering by resonating at the same frequency as the light striking it. If such a device could cope with different wavelengths of electromagnetic radiation (including visible light), in theory, the object would vanish into thin air.
      Plasmonic Covers
      Alú and Engheta investigated experimental plasmonic covers that incorporated metals, such as gold and silver, to hide visible light.
      When light strikes a metallic material, waves of electrons, called plasmons, are generated. The engineers found that when the frequency of the light striking the material matched the frequency of the plasmons, the two frequencies act to cancel each other out.
      Under such conditions, the metallic object scattered only negligible amounts of light.
      The researchers' studies show that spherical and cylindrical objects coated with plasmonic shielding material produce very little light scattering. These objects, when hit by the right wavelength of light, were seen to become so small that they were almost invisible.
      The study is supported by the U.S. Defense Advanced Research Projects Agency, which researches and develops cutting edge military technology.
      Some experts note, however, that cloaking devices that could enable military vehicles and aircraft, let alone spaceships, to become completely invisible to the enemy are likely to remain elusive for the foreseeable future.
      John Pendry, the Imperial College physicist, said that light-shielding covers would have to be customized to match the properties of each and every object they hide.
      It would be still more difficult to devise shields that could cope with all wavelengths of the visible spectrum—from red to violet light—and not just a single color.
      Types of invisibility shielding previously proposed by scientists depend on advanced camouflage systems, rather than objects being made to look undetectably tiny. Such systems involve light sensors that create a mirror image of the background scene on the concealed object.
      Don't Miss a Discovery
      Sign up our free newsletter. Every two weeks we'll send you our top news by e-mail (see sample).
      Despite the exciting possibilities raised by the new research, it may take us some time before science is able to catch up with those evasive Romulans.




      [Non-text portions of this message have been removed]
    • Jahnets
      Do you really think this information would be out if they didn t have it already??? ... From: Light Eye [mailto:universal_heartbeat2012@yahoo.no] Sent:
      Message 2 of 2 , Mar 1, 2005
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        Do you really think this information would be out if they didn't have it
        already???



        -----Original Message-----
        From: Light Eye [mailto:universal_heartbeat2012@...]
        Sent: Tuesday, March 01, 2005 2:08 AM
        To: Global_Rumblings@...; SpeakIt@...;
        SkyOpen@yahoogroups.com; ufodiscussion@yahoogroups.com;
        changingplanetgroup@yahoogroups.com
        Subject: [ufodiscussion] Invisibility Shields Planned By Engineers



        Dear Friends,

        http://news.nationalgeographic.com/news/2005/02/0228_050228_invisibility.htm
        l

        Love and Light.

        David


        Invisibility Shields Planned by Engineers
        James Owen in London
        for National Geographic News

        February 28, 2005

        In popular science fiction, the power of invisibility is readily apparent.
        Star Trek fans, for example, know that the devious Romulans could make their
        spaceships suddenly disappear.
        But is the idea really so implausible? Not according to new findings by
        scientists who say they have come up with a way to create cloaking device.



        Electronic engineers at the University of Pennsylvania in Philadelphia are
        researching a device they say could make objects "nearly invisible to an
        observer." The contrivance works by preventing light from bouncing off the
        surface of an object, causing the object to appear so small it all but
        disappears.
        The concept was reported today by the science news Web site news@....
        It says the proposed cloaking device would not require any peripheral
        attachments (such as antennas or computer networks) and would reduce
        visibility no matter what angle an object is viewed at.
        Sir John Pendry, a physicist at Imperial College, London, said the concept
        potentially holds several important applications "in stealth technology and
        camouflage."
        While types of invisibility shielding have been developed before, the
        phenomenon described by Andrea Alú and Nader Engheta sounds like something
        that might have been witnessed from the bridge of science fiction's starship
        Enterprise.
        The concept is based on a "plasmonic cover," which is a means to prevent
        light from scattering. (It is light bouncing off an object that makes it
        visible to an observer).
        The cover would stop light from scattering by resonating at the same
        frequency as the light striking it. If such a device could cope with
        different wavelengths of electromagnetic radiation (including visible
        light), in theory, the object would vanish into thin air.
        Plasmonic Covers
        Alú and Engheta investigated experimental plasmonic covers that incorporated
        metals, such as gold and silver, to hide visible light.
        When light strikes a metallic material, waves of electrons, called plasmons,
        are generated. The engineers found that when the frequency of the light
        striking the material matched the frequency of the plasmons, the two
        frequencies act to cancel each other out.
        Under such conditions, the metallic object scattered only negligible amounts
        of light.
        The researchers' studies show that spherical and cylindrical objects coated
        with plasmonic shielding material produce very little light scattering.
        These objects, when hit by the right wavelength of light, were seen to
        become so small that they were almost invisible.
        The study is supported by the U.S. Defense Advanced Research Projects
        Agency, which researches and develops cutting edge military technology.
        Some experts note, however, that cloaking devices that could enable military
        vehicles and aircraft, let alone spaceships, to become completely invisible
        to the enemy are likely to remain elusive for the foreseeable future.
        John Pendry, the Imperial College physicist, said that light-shielding
        covers would have to be customized to match the properties of each and every
        object they hide.
        It would be still more difficult to devise shields that could cope with all
        wavelengths of the visible spectrum—from red to violet light—and not just a
        single color.
        Types of invisibility shielding previously proposed by scientists depend on
        advanced camouflage systems, rather than objects being made to look
        undetectably tiny. Such systems involve light sensors that create a mirror
        image of the background scene on the concealed object.
        Don't Miss a Discovery
        Sign up our free newsletter. Every two weeks we'll send you our top news by
        e-mail (see sample).
        Despite the exciting possibilities raised by the new research, it may take
        us some time before science is able to catch up with those evasive Romulans.




        [Non-text portions of this message have been removed]





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