lattice constant in optiFDTD

Hi Poonam,

The lattice constant is the Scale parameter within Lattice Dimensions within the Crystal Lattice properties. I would encourage you to review the tutorials (located within the manuals that are installed with the product) and webinars (https://www.gotostage.com/channel/optiwave) as there are a number of points were we review creation of photonic crystals in the product.

Scott

Hi Poonam,

It is how you are defining your user variable. The way this form is configured is to support the use of expressions with other variables if you wanted. You put the expression/value you want in the expression box and the value box is the value your expression evaluates to. So let us assume you want a lattice constant of 0.4 um then for your case

Name: a
Expression: 0.4
Value: 0.4 (This is generated by the product)

To explain what I mean if you had a variable b that was 0.3 and you wanted your lattice constant to be 2 times that then you would do this

Name: a
Expression: 2*b
Value: 0.6

Hope this helps!

Hi Poonam,

There is not a direct hybrid crystal option but this can be done by carefully creating multiple crystals and overlapping them. This solution does depend on the specific design you are implementing. Do you have a paper or reference I could see?

Scott