Negative Refractive Index in Sampled 3D data (FDTD)

- April 21, 2023 at 7:15 am
  
  Christian Erick Sutanto
  Subscriber
  
  I am currently simulating the effects of SPP on Molybdenum based nanopyramids from 200 nm to 1000 nm. Question is, when I am inserting the data for the material of the Molybdenum, It appears to have a warning that states: "warning: at least one value of the real part of the refractive index in the sample data is negative. negative values have been switched to be positive. material data with negative refractive index is not supported by sample data materials.". Do I need to use another type of material or should I let it be? Or is there an alternative way to solve this? Any help is much appreciated, thank you in advance!
- April 21, 2023 at 7:07 pm
  
  Guilin Sun
  Ansys Employee
  
  Unfortunately, you cannot directly assign index to be negative. Since negative refractive material is dispersive, you should use dispersive material model, and usually you need both permittivity and permeability negative simutaneously. Please refer to magnetic-electric model
  https://optics.ansys.com/hc/en-us/articles/360034394734
  and this example:
  https://optics.ansys.com/hc/en-us/articles/360041616614-Bulk-metamaterials-based-on-magnetic-and-electric-Lorentz-models

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