July 15, 2023 at 5:14 pmEugene SuSubscriber
In the Lumerical 2023 R1.3 Version 8.29.3401 RCWA simulation, two simulations were performed with the same structure and settings, except for the materials and maximum wavelength.
In the first simulation, the materials and minimum wavelength were 0.24 μm, and the maximum wavelength was 0.44 μm.
In the second simulation, the materials and minimum wavelength were 0.24 μm, and the maximum wavelength was 0.64 μm.
When comparing the Es.Ex data from the RCWAFieldMonitor at a wavelength of 2.4e-07, they are completely different.
Is this correct?
July 17, 2023 at 11:04 pmGuilin SunAnsys Employee
It is most likely due to material fitting. Although RCWA is frequency-domain solver, currently it still uses multi-coefficient model:
so when the wavelength range changes, the fitted result may be different. For the same geometry, different material will lead to different result. So please make sure the fitting wavelength range is the same for the two cases:
Please try and check if the result is about the same, if not exactly the same.
July 18, 2023 at 3:58 amEugene SuSubscriber
Thank you for your response.
Both simulation settings have the option "override materials frequency range" checked.
July 18, 2023 at 4:42 pmGuilin SunAnsys Employee
Then please check if the diffraction angles (theta and phi) are the same. The monitor should give E field for each diffraction order (defined by theta and phi).
July 19, 2023 at 3:30 am
July 19, 2023 at 5:09 am
July 19, 2023 at 10:00 pmGuilin SunAnsys Employee
I tested a dispersive material but could not duplicate this issue when I used:
setnamed("RCWA","use wavelength spacing",1);
and override the material fitting wavelength range to be the same, for exmple 0.4~0.7um, whereas I tested 0.4~0.5um for 6 points,and 0.4~0.6um for 11 points for a silicon slab with air holes (adpoted from online example https://optics.ansys.com/hc/en-us/articles/4414567929235-rcwa-Script-command the script "rcwa" is depreciated now).
Maybe you can choose visualze the max frequency point and see if they agree.
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- “Import optical generation” or “delta generation rate”?
- Why am I getting “process exited without calling finalize”, and how do I fix it?
- Using a license file on a new license server
- Ansys Insight: Diverging Simulations
- Error: addfdtd is not a valid function or a variable name
- Questions about the calculation of the cross-polarization conversion efficiency of metasurface
- Error on Lumerical device
- Ansys Insight: About override mesh in FDTD: its use and settings
- Finding your Ansys (or Lumerical) account number
- Lumerical – error message when trying to open from Linux terminal
© 2023 Copyright ANSYS, Inc. All rights reserved.