# Modes Interference

Modes Interference — MC Grating documentation for Modal Crossed. This window can only be opened from the Modes page for structures with a single layer…

Canonical: https://mcgrating.com/docs/modal-crossed/modes-interference.html


Written by Nikolay M. LyndinLast revised 2018-01-14

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](mailto:mc@mcgrating.com).

This window can only be opened from the Modes page for structures with a single layer containing the grating. This window provides the user with the possibility to calculate the dependence of the reflection and transmission parameters of the zero diffraction order on the thickness of the layer for the selected group of grating modes, and also to study the dependence on the same parameter the mean value over the layer depth the modulus of the selected grating mode. The averaging of modes module is carried out over the thickness of the grating layer. This averaging and direction of mode propagation – “up” and “down” is only meaningful for modes with decreasing of amplitude module.
 The user can select a group of modes either by specifying two selection criterion parameters, or simply by listing the global indexes of the modes group. The numbering of modes on this window is considering as “local”. The term "global" refers to the numbering of the modes on the Modes page.
 The refresh button initializes the selection and fills all the necessary vectors and matrices with the correct values from Modes page. The format for displaying data is also inherited from this page.
 The user has the opportunity to inspect these values or to proceed to the investigation of the dependencies on the thickness of the layer.
 The scan results of the main code and of the Interference dialog are displayed in the same window. So, the user can compare these scanning.

**Note 1 **Description of the calculation method is in the ***[Appendix](https://mcgrating.com/docs/modal-crossed/appendix.html)***.

From the in-application help of Modal Crossed, documented through 2018. If you publish results computed with MC Grating, see [how to cite it](https://mcgrating.com/references.html#cite).