Dear All,
I want to simulate an ITO based plasmonic modulator. In the reference paper, Si waveguide is ground (V=0V) but I don’t know how do it in optical simulation region like Lumerical Mode Solution. I locate an ITO thin layer on the Si waveguide and apply zero voltage to ITO layer by Drude model script. But my simulation results are wrong. I attached paper at the following. Thanks.
Hello Akram Hadinezhad
If you want to apply voltage for your structure in Lumerical Mode Solution, you should write a script for different voltage levels. You don't need to apply voltage physically. You should write a script for voltage range (for example, between 0V and 1V). By applying voltage with a script, you can calculate the amount of the loss for different wavelengths, and you can calculate FoM (Figure of Merit), MD (Modulation Depth), and ER (Extinction Ration). For more information about applying a voltage to modulators, it is best to use the following articles:
Article Broadband optical waveguide modulators based on strongly cou...
Article An optical modulator with ridge-type silicon waveguide based...
Article Broadband graphene-on-silicon modulator with orthogonal hybr...
Best regards, Hossein Karimkhani
hello Akram Hadinezhad
The above discussion by Hossein Karimkhani is valid but if you have options available use lumerical's device charge simulator.
You can apply voltage in charge simulator and change in np density can be exported to mode or fdtd of lumerical. This np density is with respect to the change in applied voltage.
For your perticular case, from your reference paper, check the charge concentartaion in ITO in charge solution, keep it same as that given in the paper. then the results will come same.
Thanks
The most straight forward way to do this is by using Lumerical's Charge Simulator along with mode simulator or FDTD as suggested by Lalit Singh. Voltage can be applied in Charge Solver by using its boundary conditions. You can define a metals touching Si and ITO and then give one electrode 0V while a constant or a set of voltage can be applied to the other electrodes.
If your purpose is to understand the behaviour of the optical waveguide in a "real-life" operation by applying a voltage. Then, the best thing you can do is to generate the optical generation rate from the FDTD-solution solver and then import it into DEVICE where you can use the CHARGE solver to set the electrical boundary conditions to apply a certain voltage and you will be able to monitor the carriers and see the electrical performance.
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