## Photonics

#### Transmission equation used in FDTD and MODE

• gpsar
Subscriber

I know the equation Lumerical uses for transmission is shown here

https://optics.ansys.com/hc/en-us/articles/360034405354-transmission-Script-command but when you solve for the Poynting vector what is the result? Does P = |E|^2?

• Amrita Pati
Ansys Employee

Hello,

The equation for Poynting vector is given as:
Regards,
Amrita

• gpsar
Subscriber

Hi Amrita,

Thanks for your answer. But what is the result of integrating the Poynting vector, since you are only taking the real part?

• Amrita Pati
Ansys Employee

Hello,

The Poynting vector is integrated over the monitor surface to determine the total power through the monitor cross-section. The total power is then normalized to the source power to calculate the transmission.

More details can be found on the following page:
Integrating the Poynting Vector

Regards,
Amrita