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Photon manipulation

  1. Apr 7, 2004 #1
    1.) Is it posible to somehow create some FIELD that redirects light when passing thorough?
    2.) I heard that there were some experiments with photon teleportation - is there some method to teleport photons from random place (any place; without apparature placed there; only apparature is the one with reciever)?
     
  2. jcsd
  3. Apr 7, 2004 #2

    chroot

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    By "field," I assume you mean "anything except matter." In that sense, no, there is no known way to bend or alter the motion of light without matter in the way.

    And no, quantum teleportation deals with the teleportation of the state of particles, not actual particles themselves.

    - Warren
     
  4. Apr 7, 2004 #3
    I assume you are talking about entanglement.

    Paden Roder
     
  5. Apr 7, 2004 #4

    chroot

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    No, I'm talking about teleportation.

    - Warren
     
  6. Apr 7, 2004 #5
    Yes, but the phenomenon of particles being able to simultaneously correlate states, as if they were interacting with each other, over any distance, is called entanglement. I presume you are using this phenomenon when you explain teleportation of states.

    Or am I way off base here? Because if I am, I'm done. :smile:

    Paden Roder
     
  7. Apr 7, 2004 #6

    chroot

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    Well, true, quantum teleportation is based upon entanglement.

    - Warren
     
  8. Apr 7, 2004 #7

    Kurdt

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    Photons are influenced by a gravitational field. But obviously this is a very small effect and is a lot harder to do than creating an E or B field.
     
  9. Apr 7, 2004 #8

    chroot

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    Heh, how could I have forgotten gravity? Eek!

    - Warren
     
  10. Apr 7, 2004 #9
    Yeah, I was actually thinking about this. I remembered seeing something on how if you can bend light enough using mirrors, you can somehow send information back in time. I don't know exactly how it works,... thus the reason I never put it down in the first place. Although, I don't know for sure what this has to do with teleportation. More like time travel.

    Which makes me wonder why I just posted this....

    Paden Roder
     
  11. Apr 7, 2004 #10
    Ah...are you sure about that? It would seem to violate SR to me. :confused:
     
  12. Apr 8, 2004 #11
    I had to quote my entire quesions...

    Having in mind that matter (like glass (typical example...)) bends light because of intermolecular forces I thought that it might be possible to use that fact to SOMEHOW mimic a field codition which does that... I don't know... - long ago people thought that magnetic field can come only from magnet (wow: "in some magic ways?!?"), but later we discovered that it can also be created by electricity passing thoroug a ...wire for example... Of course that it would be harder to mimic field that can bend light without acual matter in place - but supposed generator of that field should be a replacment for actual matter - just like wire substitutes magnet!..
    Crucial sentence ---> IT'S REALLY HARD TO BELIEVE THAT WE CANNOT REPLICATE SUCH SIMPLE NATURE'S EFFECT THAT SOROUND'S US EVERYWHERE!..
    (don't think that I forgot that that field would atract molecules, and also full implications of that mechanism!.. (you know what I mean))

    YES. I had entanglement mechanism in mind (I don't fully understand it, but I suppose that it has something to do with mechanism that something imitates the state of something else somewhere else). Yes I understud that it doesn't actulaly teleport photon - but it doesn't matter (it's not of the essence). My point is:
    For example: Imagine that there is some mechanism to project (with two directing aparatures which take the state of the photon on place where their imaginary directing lines intersect in space) where from you want to take the present state of the photon in existance on that place - thus replicating state of that photon at our apparature... Latter we'll think about the fact that thorough that point in space could pass infinite (?) numbers of photons...
     
  13. Apr 8, 2004 #12

    Kurdt

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    The only reason matter effects the path of light is because the speed is different in that matter than in normal space or a vacuum I should say rather. This is because the constant of the permitivity of a material is different than that of free space which determies the speed according to Maxwell's equations (which I derived in another thread; can't remember which). a magnetic field has no effect on the permitivity of a substance neither does an electric field.
     
  14. Apr 8, 2004 #13
    "magnetic field has no effect on the permitivity of a substance neither does an electric field."
    really? Some ferroelectrics change their dielectric permitivity when a voltage is applied.
    I remember reading somewhere that strong magnetic field has been used to deflect laser in attempts to design TVs using lasers, though effect was too small for being useful. not true?

    Field that redirects light must be field of varying permittivity or permeability. Can this be done to vacuum? Casimir vacuum?
     
  15. Apr 8, 2004 #14

    Kurdt

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    Yes well i the context of this thread the effect is so small it can be ignored unless the worlds most powerful electromagnet has been discovered and is being used for scientific research.
     
  16. Apr 9, 2004 #15
    1.) Ah! And have you ever asked yourself what is that in the matter that does this? Light goes on one speed in one matter, and on other speed in other matter - something slows it down, man(!) isn't it obvious!?! It must be some field - else: it would be absorbed!

    2.) "Constant of permitivity" is something that we (humans) invented to make it easy to calculate our equasions - it doesn't explain the core of the phenomenon.

    3.) I mentioned Magnet JUST as an example (a relation) for what I was talking about - you know:
    Magnet <---> Elctromagnet
    IS SAME AS
    Light-Bending-Matter <---> Light-Bending-Field-Generator
     
  17. Apr 9, 2004 #16
    Matter is our abstraction. What is it fundamentally? Isn't it electromagnetic phenomena?
     
  18. Apr 9, 2004 #17

    Integral

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    Bingo! We have a winner! Light travels slower through a material because it is adsorbed..Then emitted, in a very nearly random direction. I would recommend that you find a copy of QED by Richard Feynman.

    While man has become very good at utilizing our knowledge of the universe, we have never changed the way it works. Light is adsorbed and emitted, those are fundamental facts that we cannot change.
     
  19. Apr 10, 2004 #18
    Note that adsorbed is different than absorbed, and I think the conclusion of QED is that when discussing the slowing of light, the re-emission is not in a random direction. If it was, a material could not be transparent and have an index that appreciably varied from 1.
     
  20. Apr 10, 2004 #19

    FZ+

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    Er... Yes it is in a random direction, but the probabilities of it taking different paths ae not uniform. It is random, but its randomness still obeys some laws.
     
  21. Apr 10, 2004 #20
    OK then... While we're still here - a qustion related to something I've said in some post before...

    OK - you explained that the process of aDsorbtion is the thing that does the slowing-of-the-light bussines; but while I was thinking wrong (that intermolecular forces do that) I mentioned that (if it (intermolecular force) is to be used to bend light) it would atract matter too.
    Question: Is it posible to mimic intermolecular force (what is it?)?

    (Oh; also don't forget the other question (about teleportation of the state of photon from a random place...))
     
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