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plasmonic frequency divider

Discussion in 'Electronic Design' started by Jamie M, Dec 31, 2012.

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  1. Jamie M

    Jamie M Guest

    Hi,

    I was wondering if something exists to divide the vibration frequency of
    a surface plasmonic wave? Like if there is a light source that
    creates a surface plasmonic wave on a nano-scale metal sheet, is there
    a way to reduce the frequency with some type of frequency divider
    equivalent device?

    cheers,
    Jamie
     
  2. Jamie M

    Jamie M Guest

    Hi,

    Also wondering if anyone has any ideas on how to implement a "plasmonic
    mixer", fed with two light signals (L1 and L2), and having the same
    functionality as an RF mixer in that the output would be L1 + L2 and
    optionally L1 - L2.

    cheers,
    Jamie
     
  3. Sjouke Burry

    Sjouke Burry Guest

    There are some crystals able to do that. I once bought a
    infrared detector, where a crystal layer doubled/triplet the
    frequency of the infraared falling on it.
    It was rather insensetive however, just enough for the laser
    i was experimenting with.
    You might try mixing with that non-linear crystal sheet.
     
  4. Tim Williams

    Tim Williams Guest

    That would be very neat. I could imagine, say, for the utmost accuracy,
    start with a Rb or Cs microwave source, amplify if necessary, then start
    multiplying harmonics out. By the time you get to infrared, you've got
    zillions of channels, phase locked to a highly stable and pure reference
    (depending on how much phase noise adds up in the process, hmm), and the
    same thing on the receiver side can demodulate each band down in parallel
    for slower processing (i.e., gigabits/ch into an FPGA). Downsides
    include, once you get to the 20th harmonic from multipliers and you've no
    power left, how do you amplify the THz without another amp (as such)? But
    then, that's what the parametric mumbo jumbo is for.

    How wide is the average IR "channel"? Say, a few percent out of 300THz is
    a *lot* of bandwidth. And the coherent wideband (or comb spectrum) could
    do very interesting optical interferometry, especially with a phase
    sensitive detector -- correct me if I'm wrong, but that's kind of a holy
    grail among optics, right? :)

    Tim
     
  5. Am 02.01.2013 05:48, schrieb Jamie M:
    I have seen that in action > 10 years ago. Two lasers shining into
    a receiver diode and on the spectrum analyzer one could see the
    beat at 60 or 70 GHz or so. They tuned one of the lasers somewhat
    and the beat frequency moved by 10 or 20 GHz. Nice stunt.

    regards, Gerhard
     
  6. ^^^^
    I put in 1uF, but that didn't work.
    (Well, only a frequency doubler)

    George H.
     
  7. Jamie M

    Jamie M Guest

    Hi,

    That is really neat, what would the best practical efficiency in the
    light absorption stage be? Could you make a plasmonic mixer with
    that stuff (ie with a reference light source as well as the input light
    source)? If you could and also have good quantum efficiency,
    that would be great, I have a feeling that there might be big losses
    in the circuitry though, not sure however, maybe with nano-scale stuff
    the losses disappear too. Really interesting work you've done!

    cheers,
    Jamie
     
  8. I'm not sure if this meets your definition of average but DWDM used for
    communications at (nominally) 1550nm often uses a 100GHz, 50GHz, 25GHz or
    12.5GHz grid.

    The frequency is related to the channel number as
    193.1THz + n * 12.5GHz * 2^M

    where n is the channel number and M is 0, 1, 2, etc. to suit the grid
    size.

    Here's the relevant ITU-T recommendation for DWDM:
    http://www.itu.int/rec/T-REC-G.694.1-201202-I/en

    Regards,
    Allan
     
  9. Googling 'parametric frequency divider', I get lots of hits, but
    nothing that
    explains how it works. (Or its buried behind the publishing 'money'
    wall.)

    George H.
     
  10. Fred Abse

    Fred Abse Guest

    It's those damn Greek mu things again. Not traveling well on Usenet.

    Mine come out as "1/u00b5", when copied and pasted, although they appear
    correctly in the newsreader.

    Character set conflicts. I always check the "convert Greek mu" option,
    some others don't.
     
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