Photonics

Photonics

Transmission More than 1

    • rajatkumar.sinha
      Subscriber

      I tried designing a metasurface but the transmission is coming out to be greater then 1. Also the transmission seems to vary if i change the simulation region. I have tried chainging the mesh order, pml layer, simulation time, nothing seems to be working and everytime i am getting value of transmission more then 1. 

    • Guilin Sun
      Ansys Employee

      From your description, most likely it is either due to PML: maybe too close to the nano structures, or fewer PML layers, or strong reflection at larger diffraciton angles, or not small enough the autoshut off min in FDTD "Advanced options". Please increase FDTD span along propagation direction, increase the PML distance and number of layers, and reduce the autoshutoff min to be 1e-6 or 1e-7, and make sure the simulation time is long enough and the simulation is terminated before the progress reaches 99%. 

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