MC Grating

Resonance

Applies to:Modal CrossedC method Crossed

Written by Nikolay M. LyndinLast revised

This documentation was written for releases up to 2018 and is being revised. Some dialogs have changed since. If something does not match what you see, write to mc@mcgrating.com.

  • The resonance search is aimed at searching for anomalies of the reflected and the transmitted waves when the incidence angle is changed in a fixed incidence plane. These anomalies could be caused, for example, by excitation of the waveguide modes the dielectric structure under modeling. The incidence plane is defined in the General page. It looks for the pole parameters (position - angle and width) associated with the reflection (transmission) anomaly (resonance) of the selected polarization (Polarization Output). At the page opening the software automatically estimates the waveguide parameters by calculating the mode effective indexes of the multilayer structure under the assumption of a structure with real refractive indexes, the grating regions being considered as suitably averaged uniform layers. The exact resonance search can then be performed for a defined initial resonance position - angle and width with the button Find and iteratively improved with the same button changed to Repeat. The main resonance parameters are calculated on the basis of the phenomenological resonance response approximation by poles functions using five (single resonance) or seven (double resonance) equidistant angular positions located within an angular range covering four Half Resonance Width symmetrically with respect to the resonance Angle position.
    If the Double Resonance check box is checked two consecutive poles will be calculated. This double resonance search is obligatory in two cases: first under normal incidence, secondly in the case of two neighboring resonances (poles).
  • The full set of poles parameters can be found after the resonance searching in an appropriate page of Analysis dialog.
  • The all fields and controls of this page are rather obvious.

From the in-application help of Modal Crossed, documented through 2018. If you publish results computed with MC Grating, see how to cite it.