Regular Section
Estimation of Surface Waves along a Metal Grating Using an Equivalent Impedance Model
2012 Volume E95.C Issue 4 Pages 717-724
Details
2012 Volume E95.C Issue 4 Pages 717-724
The cause-and-effect relation between plasmon-resonance absorption and surface wave in a sinusoidal metal grating is investigated. By introducing an equivalent impedance model, similar to an equivalent circuit on an electric circuit, which is an impedance boundary value problem on the fictitious surface over the grating, we estimate the surface wave from the eigen field of the model by using the resonance property of the scattered field. Through numerical examples, we illustrate that the absorption in the grating occurs in the condition of exciting the surface wave along the model, and the real part of the surface impedance is negative on about half part of the fictitious surface in the condition.
