Thank u so much for your response Sir. I am getting a PBG for my design as 0.269228 c/a to 0.453655 c/a on the scale of wave vector k. Firstly I wanted to know how can I calculate wavelength range from this value (a = 1 micro meter the default setting). Operating wavelength of my design is 1430nm.
Secondly, How can i change the r/a ratio. I am taking r as the radius of air holes and is equal to 0.3a.
Can i optimize the value of lattice constant ‘a’ to get maximum transmission efficiency.