Transmission through periodic nano array

Hello all,

I am trying to simulate the transmission through the periodic array which is fabricated on ITO coated substrate. According to the theory, this system should give us two peaks one corresponds for plasmon and other for waveguide mode. But I am not getting any type of signal. The transmission signal is very noisy and random.

Also, my model is showing some error.

I am posting my model. Can anyone help me in this regard?

Thanks