Spoof Plasmons / Designer Surface Plasmons

Aim of this article/post: To 1) introduce the concept of Designer surface plasmons or Spoof plasmons and 2) Dispersion relations and Visualization of the fields using MEEP code. (Some of the text/simulations are taken from my paper in the area of DSPs.)

Surface Plasmons are electromagnetic waves that travel at the interface of metals such as Ag/Au (follow Lorentz-Drude dielectric model) and a dielectric. Surface plasmons are not expected in perfect electric conductors (PEC’s) as the electric field inside the metal is zero. However, highly localized surface-bound states appear when the PEC is periodically modulated with arrays of sub-wavelength square or circular holes. Both theoretical and experimental studies suggest that surface-bound states and SPs exhibit similar dispersion relationships. Due to the similarity such surface-bound states are referred to as ‘spoof’ or ‘designer’ surface plasmons (DSPs).

Structured PEC surfaces and the excited DSPs have recently garnered interest within the photonics community, as a new platform to engineer surface-bound states of a wide frequency range.  An important example is the guiding of terahertz-range radiation  in the form of DSPs. This enables the application of terahertz plasmonics to near-field imaging, sensing, and spectroscopy. A prime advantage of DSP is that, unlike conventional SP, the propagation of these waves can be controlled by engineering the material-independent, perceived group index. PEC structures have been engineered to guide DSPs of speci?c terahertz-range frequencies. To know more about DSP’s and relevant references, see references in my paper on DSP’s here.

In the figure below, I show how DSP’s are excited. I also show numerically calculated dispersion curves and fields. These were obtained using freely available finite difference time domain simulation software, MEEP.

Schematic shows the excitation of Designer surface plasmons (DSPS) (left). Inset shows the fields (Ey and Ex). Dispersion relationship of these waves (right))

 

Update on May 2 2013: (Here is my project file)

9 thoughts on “Spoof Plasmons / Designer Surface Plasmons

  1. Hi!
    I’m a graduate student at the federal university of Alagoas in Brazil. I’m study the interaction of the light with plasmonic systems, and I’m use the meep to simulate these systems.
    I wanna know if any body can tell me, where I can find a script on meep for plamonic systems.

    thank you very much

  2. Dear Bala Krishna Juluri,
    I am a PHD in DIT (Dublin Institute of Technology), and I am very interested to get if possible your meep code for SPPs.
    I am really appreciate you mail me the meep code: D10126783@mydit.ie.
    Thanks a lot.

    Yours sincerely,
    Youqiao Ma.

  3. Hi!I’m a graduate stnedut at the federal university of Alagoas in Brazil. I’m study the interaction of the light with plasmonic systems, and I’m use the meep to simulate these systems.I wanna know if any body can tell me, where I can find a script on meep for plamonic systems.thank you very much

  4. Dear Bala:

    Would it be possible that you could share the code for field computation and dispersion relation for the spoof plasmons.

    Thanks

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