Photonics

Photonics

Absorption monitor issue – plasmonic nanograting

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    • fbk
      Subscriber

      Dear all,

      I am trying to simulate a 1D metallic grating of Silver, over a double layers of silicon nitride and oxide, 11 nm and 5 nm, respectevely. The metallic nano grating is embedded in a PMMA passivation to avoid silver oxidation and the device is placed on 3um of Si. Schematic rapresentation of the strcuture in figure 1.

    • Kyle
      Ansys Employee
      nThe fields will vary rapidly near the surfaces or corners of metals, so very high mesh density is often required in these areas. I would recommend that you use convergence testing to see if the results (A, R and T) are changing as you reduce the mesh size. While these are high field values, they don't cover a large area so it's possible they won't drastically affect the results. You should also use an integer number of mesh cells over the metal object to ensure the mesh cells overlap with the metals.nAlternatively, you could use the DGTD solver for this simulation. It is well suited for plasmonic simulations like this. You might also consider replacing the metal rectangle with a rectangle with rounded corners. This should be more accurate, as the actual device won't have perfectly sharp corners.nPlease try that and let me know if it helps.n
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