Forum Replies Created

    #48978
    Damian Marek
    Moderator

    Make sure when you export the spectrum you use the proper format.

    In OptiGrating Tools->Export Complex Spectrum…
    Make sure to choose OptiSys as the format.

    #48884
    Damian Marek
    Moderator

    The 32 bit version of OptiFDTD is an older version and does not have a project browser. You can use our tutorials on our website or the ones found in your installation directory in the “docs” folder.

    Introduction

    #48883
    Damian Marek
    Moderator

    I suggest you start by looking at our tutorial on using the Photonic Crystal tool:

    Photonic Crystal and Photonic Band Gap Introduction

    #48871
    Damian Marek
    Moderator

    The number of time steps is most likely not large enough for the optical signal to reach the detector. Place an Observation Point at the same distance and view the time domain signal. The gaussian pulse should be completely recorded, if not increase the number of time steps in the simulation settings to allow the simulation to run longer.

    Damian

    #48866
    Damian Marek
    Moderator

    Technically this is possible, but in practice I am not so sure. You could script the generation of numerous Observation Areas, that are all offset by 1 mesh point. This would capture the slices of the volume in different observation areas, which you could then export the fields using the scripting language as well.

    However, if you are measuring the absorption of a waveguide you would probably be fine with only having a couple observation areas and interpolating the data in between the areas. If you are exciting propagating modes then the field distribution should be changing very slowly over the length of the waveguide.

    Damian

    #48625
    Damian Marek
    Moderator

    You cannot export the electrode part only the response of the optical signal. You will only be able to export the Scattering Matrix for a single operating voltage.

    #48624
    Damian Marek
    Moderator

    You can use Observation Areas to detect the amount of power flow through each arm in a coupler and compare that to the input power. See our TE planar waveguide coupler splitter tutorial in the OptiFDTD installation folder.

    #47860
    Damian Marek
    Moderator

    Keivan,

    As this question is FDTD-based, I can help you with it. OptiFDTD can be used to simulate nonlinear materials with 2-order, 3-order responses as well as the Raman effect.

    These nonlinear effects are limited to 2D simulations.

    Damian

    #45462
    Damian Marek
    Moderator

    Yes you can. If you apply the same voltage to both arms both optical signals will accumulate a phase shift proportional to the applied voltage. If the voltage varies in time you will have a phase modulated signal.

    +1
    #45094
    Damian Marek
    Moderator

    Can you attach the file as a Zip?

    #45092
    Damian Marek
    Moderator

    I am not familiar with OTSB, but I think you are talking about Optical Dual Sideband Suppressed carrier and Optical Single Sideband Suppressed Carrier. We have a sample of ODSB found in the samples folder->Microwave and RF optical Systems that you could take as a building block.

    +1
    #45071
    Damian Marek
    Moderator

    There is an absolute maximum for the time step size, but no formula for directly calculating what minimum is the correct choice. The default choice of OptiFDTD is the aforementioned maximum. This at least guarantees a stable simulation.

    I think your issue might be the number of time steps and not the individual time step size. Resonators and cavities trap light within them and it takes time for the light to leak out (Q-factor). This means that you will need to check to see if the energy in the resonator has had time to leave. You can do this by using an observation point placed inside the resonator or at on of the ports. You should see the electric field decaying with something similar to an exponential envelope. Check to see if the electric field has diminished to an appropriately small value by the end of the simulation.

    #44806
    Damian Marek
    Moderator

    You will not be able to convert the .fdt file to .bpd, so you will have to create your design in OptiBPM. OptiBPM is focused on guided optics and so there is no tool that will automatically generate photonic crystals. You can use the scripting functionality to generate your required shapes.

    #44738
    Damian Marek
    Moderator

    There are quite a few! I know of a good article relating to plasmon polariton type waveguides:

    https://journals.aps.org/prb/abstract/10.1103/PhysRevB.61.10484

    This is a good starting point to get familiar with the characteristics of these types of waveguiding structures. We have an example of thsi type of structure as well:

    Plasmon Polaritons – Vector Finite Element Method

    #44737
    Damian Marek
    Moderator

    Please contact info@optiwave.com for licensing related queries.