hello Nisa
Thanks a lot for the link , the book is no expensive. The library can buy it, but i have just claimed one in optical FDTD and they will not accept two claims in the same time.
Anyway I am expert in LED design , i have design and manufactured optical encoders and different type of lights . From Laser diodes to LEDs. Hahaha. I was curious 🙂
Best Regards
luis