focused Gaussian beam

Can anyone tell me how to simulate a focused Gaussian beam in FDTD simulation.
Or provide me any information to achieve it.
Many thanks!

This might be useful to you.
http://www.emexplorer.net/example_opticaltweezer.htm

Hi

u can contact me by email, i wil give u code to do this

Hi, exeyez, thanks for your information! however, i find the bit rate is so slow that i hardly open the link. Can you do some introduction?

Hi, medaziz, many thanks for your help! i am new here how can i find your email and make contact with you. By the way, what to ask what is the language of your code, like C,C++ or Mathlab etc.