pcf with two cores

Dear all,

I am trying to make dual core PCF structure the figure is attached here

kindly let me how to create such two core PCF. and another is I want to change gap rod between two cores with large radius compared to the surrounding air holes.

with many many thanks

Hi, Nanda

Just make normal PCF structure, add a circle at the center, and delete two circles in the first layer. Script is useful to do this.

thank you …

You may want to use the hexagonal lattice H-cavity structure group from the Object Library, which is also used in this example:

You can use this structure group to set up the patterning of the cladding with H number set to 2 so the central rod and innermost ring of rods is not included, then you can manually add the necessary additional rods to fill in the desired pattern in the central region.