MC Grating

Options

This topic for:Modal 1DModal CrossedC method 1DC 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.

  • If the Save Settings box is checked then all Scanning, Fields and Options parameters will be saved in the structure file in addition to the parameters from the General and Layers pages. The part of the structure text file with settings is hidden for the user but accessible with any external text redactor.
  • The check box Background calculation disables the output to the result editor window during the calculation process.
  • If the Number of Modes Correction box is checked, then if necessary the software will automatically increase the values of Number of Orders to the adequate number of Cover and Substrate X and Y diffraction orders.
  • Check box Advanced Options is visible if the structure contains sections of Advanced Options. If the Advanced Options check box is not checked, the software ignores the Advanced Options sections in the structure.
  • If the Favor Memory Consumption box is checked the software utilizes minimum possible memory to complete calculation. This option is incompatible with the field calculation.
  • Calculation Direction option is useful for calculation of structures with a uniform layers stack. Calculation is faster if it starts from this stack section.
  • For the Field calculation and to activate the page Fields the box Field Calculation should be checked at that the page Scanning becomes inactive. The Autoselect check box allows enabling/disabling of a conformation dialog appearance while the user enters the Fields or Scanning disabled pages. The fields are calculated in two steps: calculation of the structure for the fixed parameters followed by the field distribution calculation in accordance to the page Fields settings.
  • If the Automatically Start Second Stage box is not checked, then the calculation will be stopped after the first step and the user should press Run to proceed with the second step. This option is useful to check the intermediate results in the editor window. Changes in page Fields do not activate the first step.
  • For a reasonable response of the other windows applications it is not recommended to increase the Calculation Priority greater than Idle.
  • In the case of the TM polarization and a binary highly conductive metal grating the truncation of Fourier representation of Maxwell's equations generates spurious plasmon-like modes. These modes have anomalously high effective refractive indexes and are responsible for the so called numerical instabilities. They do not present in the real lamellar structure (TMM) modes spectrum. If the Neff Filter Level box is checked the software considers the modes with effective refractive index above the specified level as no propagating in the layers. These modes are still used at the interfaces field matching. This option may be used to suppress so called numerical instabilities. For more details see Ref.7 in the Introduction.
  • If Using NV Field box is checked the NV Field Method is applied (Ref. 4-6 in the Introduction) and the Smoothing NV Field option can be applied with the corresponding smoothing parameters. The resulting Normal Vector Field can be checked with the tools of NV Field panel.

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