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      CommentAuthorTrim
    • CommentTimeOct 15th 2009 edited
     
    Source=New Scientist

    It looks like the CURLiTRON has got a serious rival or it could have a CURLiTRON at the centre.

    First black hole for light created on Earth
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      CommentAuthorAngus
    • CommentTimeOct 15th 2009
     
    Posted By: TrimSource=New Scientist

    It looks like the CURLiTRON has got a serious rival or it could have a CURLiTRON at the centre.

    First black hole for light created on Earth


    Impedance-matching, with publicity.
  1.  
    Fabricating a device that captures optical wavelengths in the same way will not be easy, as visible light has a wavelength orders of magnitude smaller than that of microwave radiation. This will require the etched structures to be correspondingly smaller.


    Then fabricate for a slightly longer wavelength, say infrared, the earth releases a considerable amount of blackbody? radiation in the evening, this technique seems like a good way to capture it and concentrate it to heat water perhaps.
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      CommentAuthorAngus
    • CommentTimeOct 15th 2009
     
    Posted By: RunningBare
    Fabricating a device that captures optical wavelengths in the same way will not be easy, as visible light has a wavelength orders of magnitude smaller than that of microwave radiation. This will require the etched structures to be correspondingly smaller.


    Then fabricate for a slightly longer wavelength, say infrared, the earth releases a considerable amount of blackbody? radiation in the evening, this technique seems like a good way to capture it and concentrate it to heat water perhaps.


    What? These are usually microfabricated resonant structures on a substrate. Works over a fairly narrow band. Hard to couple into. Lousy way to heat anything.
  2.  
    Posted By: Angus

    What? These are usually microfabricated resonant structures on a substrate. Works over a fairly narrow band. Hard to couple into. Lousy way to heat anything.


    I'm open to ideas for anything that can convert radiation at night into usable energy, don't know if these guys have overcome the problem of conversion yet, but the technique is sound http://www.engadget.com/2008/02/02/infrared-solar-panels-even-work-at-night-but-cant-output-energ/, someone else has just come up with the first molecular diode, unfortunately I cannot presently find the article, I'm curious as to whether these diodes would be fast enough to convert the incoming frequency to a useful DC voltage.
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      CommentAuthorAngus
    • CommentTimeOct 15th 2009
     
    Posted By: RunningBare
    Posted By: Angus

    What? These are usually microfabricated resonant structures on a substrate. Works over a fairly narrow band. Hard to couple into. Lousy way to heat anything.


    I'm open to ideas for anything that can convert radiation at night into usable energy.


    Easy: Bonfires or breathing. Just keep emitting CO2, it stops the heat getting out.
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      CommentAuthorTrim
    • CommentTimeOct 16th 2009
     
    Posted By: RunningBaresomeone else has just come up with the first molecular diode, unfortunately I cannot presently find the article, I'm curious as to whether these diodes would be fast enough to convert the incoming frequency to a useful DC voltage.


    Is this the one RB

    from Physorg Researchers create molecular diode

    (found it on my please thread)
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      CommentAuthorAngus
    • CommentTimeOct 16th 2009 edited
     
    Posted By: Trim
    Posted By: RunningBaresomeone else has just come up with the first molecular diode, unfortunately I cannot presently find the article, I'm curious as to whether these diodes would be fast enough to convert the incoming frequency to a useful DC voltage.


    Is this the one RB

    from PhysorgResearchers create molecular diode

    (found it on my please thread)


    Infrared runs from about 300GHz to 300 THz. You can get to 2.5 THz with one of these;

    Terahertz rectifier
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      CommentAuthorTrim
    • CommentTimeOct 16th 2009
     
    Thanks Angus nice link.
    • CommentAuthorjoshs
    • CommentTimeOct 16th 2009
     
    Posted By: TrimSource=New Scientist

    It looks like the CURLiTRON has got a serious rival or it could have a CURLiTRON at the centre.

    First black hole for light created on Earth
    It's an ideally terminated antenna. It does not suck anything in. It simply very effectively absorbs what impinges it without reflection.
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      CommentAuthorAngus
    • CommentTimeOct 16th 2009
     
    Posted By: joshs
    Posted By: TrimSource=New Scientist

    It looks like the CURLiTRON has got a serious rival or it could have a CURLiTRON at the centre.

    First black hole for light created on Earth
    It's an ideally terminated antenna. It does not suck anything in. It simply very effectively absorbs what impinges it without reflection.


    Impedance-matching, with publicity (II)
    • CommentAuthorjoshs
    • CommentTimeOct 16th 2009 edited
     
    Posted By: Angus
    Posted By: joshs
    Posted By: TrimSource=New Scientist

    It looks like the CURLiTRON has got a serious rival or it could have a CURLiTRON at the centre.

    First black hole for light created on Earth
    It's an ideally terminated antenna. It does not suck anything in. It simply very effectively absorbs what impinges it without reflection.

    Impedance-matching, with publicity (II)
    That's what an ideally terminated structure does: present the conjugate impedance of the transmission medium. Conversely, there is no better energy absorbing material than an infinite transmission line.
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      CommentAuthorAngus
    • CommentTimeOct 16th 2009
     
    Posted By: joshs
    Posted By: Angus
    Posted By: joshs
    Posted By: TrimSource=New Scientist

    It looks like the CURLiTRON has got a serious rival or it could have a CURLiTRON at the centre.

    First black hole for light created on Earth
    It's an ideally terminated antenna. It does not suck anything in. It simply very effectively absorbs what impinges it without reflection.

    Impedance-matching, with publicity (II)
    That's what an ideally terminated structure does: present the conjugate impedance of the transmission medium. Conversely, there is no better energy absorbing material than an infinite transmission line.


    We're having a violent agreement
    • CommentAuthorjoshs
    • CommentTimeOct 16th 2009
     
    Oh no we're not! We're agreeing violently!
  3.  
    I actually did some work on structures very similar to this; photonic crystals. They're interesting but whoever called it a 'black hole' was fishing for publicity and grant money.
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      CommentAuthorTrim
    • CommentTimeOct 16th 2009
     
    Very good PR though.
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    Definitely. Nothing wrong with that!