How to define lattice constant in Optifdtd

[Saurabh Bhamra]

I have just started working on Optifdtd so that I can do more in my research. I know how to change major,minor radius of the rods but the I’m still unable to figure out where to define Lattice constant (a) along with the radius for example if r is 0.25a then how to define it in Optifdtd software. Please reply if anyone knows.

[Damian Marek]

In the Crystal Lattice Properties window you can change the lattice constant by modifying the scale value. They have the same meaning. I suggest following the tutorial at :

Photonic Crystal and Photonic Band Gap Introduction

[Saurabh Bhamra]

First of all thanks for your reply. You mean to say I have to define lattice constant like the one I have done in the screenshot below(screenshot 1) ?. Earlier I was defining it in “elliptical waveguide properties” as shown in screenshot 2

Attachments:

1. 

   Screenshot_1.png
   

2. 

   Screenshot_3.png
   

[Damian Marek]

Correct, the scale gives the distance between unit cells, same as a lattice constant.

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