Home Forums FDTD Photonic Crystal Lattice

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    • #19255
      harkiranjeet kaur

      What is the main difference between Hexagonal photonic lattice and Triangular lattice as they appear almost similar? How to simulate triangular lattice in optiFDTD? Any idea, which one of these: square, hex, triangular performs best as far as losses are concerned?

    • #19262

      Hi harkiranjeet kaur,

      According to your first question (as far as I can understand it), the main difference between Hexagonal photonic lattice and Triangular lattice is the geometry of the molecular lattice structure which lays beyond it. This lattice geometry can be observed with the respect to a virtual plane perpendicular to the main optical axis. According to your second question, I don’t have a lot of experience in modeling triangular lattice in OptiFDTD, so I won’t be able to give you a good advice.

    • #19264

      When you are talking about the best performance, can you, please, clarify what parameters or properties can you achieve or improve and what is your the main goal of your photonic crystals application? For example, if you are investigating birefringent properties (for such devices couplers, splitters, polarization rotators, etc.) then the crystals with biggest asymmetry should work much better. In other case, you will not need these properties, i.e. for waveguides.

    • #19266
      Saurav Chanda

      Hi Harikiranjeet, as far the difference is concerned they are different in geometrical shape and also with respect to irreduicable Brillouin zone along the k vector path. Simulation is you have to choose what type of crystal you want and accordingly create the defect to create any sort of waveguide. Well I would say the hexagonal arrangement is much better for propagation of modes and output power is significantly better and thus the loss is.

      Thank you

    • #19274


      you can take any of the structure viz. triangular, hexagonal etc.. The losses will be depending on other factors such as refractive index, core radius etc. Even I have to do the same thing.

    • #19281
      Ajay Vyas

      Yes, you are right subhashish. I know you are working in same field & expert for it.
      Good Luck

    • #19448

      Thanks Sir

    • #19890
      harkiranjeet kaur

      Thanks for the help all.

      My circuit is add drop filter, which is a kind of coupler and splitter. For me square geometry is working the best so far if i introduce certain defects at the sharp bends. I find it quite hit and trial when simulating the circuits though.

    • #19891
      harkiranjeet kaur

      Do i need a separate mode solver (other than 30 bit optiFDTD version) to visualize dipole mode, quadrapole and hexpoles when simulating the resonating cavities or its just the Electric Field Distribution Curve (in the analyser) revealing all this information?

      Thanks in adv.

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