Ansys Learning Forum Forums Discuss Simulation Photonics Strange transmitance of AlN straight waveguide on sapphire substrate Reply To: Strange transmitance of AlN straight waveguide on sapphire substrate

Guilin Sun
Ansys Employee

It might be already cutoff. Please try to use FDE to find where it begins to not support the confined mode. Maybe it is too thin to support mode at longger wavelength.

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