CST for plasmon-polariton directional coupler

Hi!

I am trying to simulate an optical directional coupler using CST microwave studio. The device consists of two air slits of width equal to 100 nm embedded in gold. The operating wavelength is 1.55 um and the distance between the slits is 120 nm. Wich boundary conditions and background material might I use? How can I setup the waveguide ports?

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