September 5, 2022 at 5:31 amkokiabeSubscriber
I'm working on simulation of topological PhC waveguide simulation. I'm trying to observe the power and Electirc field distribution of the propagation.Source is right-cirlular polalized light, reporduced by two Dipoles. For Boundry conditons I'm using PML stabilized (Periodic for Z max), and the structure is big enough to pass through the PML. For propagation power the filed monitor is placed every 1um, and I'm observe Transmission for propagation power. FDTD region is about 10um*7um*2um. Structre itself is 200nm width membrane. Right now simlulation time is 200fs, and if I make this a little longer it will diverge.
What is the appropriate time to observe power and eletctric field distribution? In addition, is this the correct method to observe the power of the propagation?
Thanks in advance.
September 13, 2022 at 6:53 pmTaylor RobertsonAnsys Employee
To analyze the PhC waveguide I would suggest following this article using bandstructure methods. This difficulty here is that there is no easy way of injecting the modes into this type of structure. The modes involved are not 2 dimensional, as they would be with a simple waveguide. So using dipoles to excite the fields and then finding the resonating frequencies should work.
I would suggest trying to look at TE and TM modes separately. You can then consider more complicated polarizations as the superposition of these two.
If the simulation is diverging that is an issue. Perhaps try changing all materials to "object defined dielectric" and PEC, for dielectrics and metals respectively. If this converges check your material fits, and make sure there is no artifical gain in the fitting. This is an example of material divergence. If not try setting BC to metal. If that converges it is PML instabillity. In that case maybe move them further away, or share a screenshot of the set-up.
To get the field profile determine the frequencies. Then set your frequency monitors to this exact frequency. It is best to apodize the signal to eliminate contributions from the initial injection. You can likely determine the loss from the decay of the time signal, assuming it is not too lossy.
October 12, 2022 at 5:43 amkokiabeSubscriber
Thank you for the reply, and I apologize for not responsing earlyer.
>>You can likely determine the loss from the decay of the time signal, assuming it is not too lossy.
Do you mean using time monitor, when obtaining time signal?
- You must be logged in to reply to this topic.
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?
- Error on Lumerical device
- Using a license file on a new license server
- Error: addfdtd is not a valid function or a variable name
- Ansys Insight: Diverging Simulations
- Ansys Insight: Transmission results greater than one
- Ansys Insight: About override mesh in FDTD: its use and settings
- Is there a Lumerical script command to output the Simulation and Memory requirements?
- Ansys Insight: Convergence issues in CHARGE
© 2023 Copyright ANSYS, Inc. All rights reserved.