Learning Forum

[Z.Shahrabifarahani]

Hello everyone,

I ran my result and got my results for the electric field. I have used both DFTmonitor and Monitor expansion. I have such a formula to calculate the potential only with the fundamental mode:

U= Ex * conj(Ex) + Ey * conj(Ey) + Ez * conj(Ez)

Using the monitor expansion, I have "a" and "b" coefficints, corresponding to transmission coefficints of each mode. And "output power" from DFTmonitor, let's name it P_simulation.

Also, I want to calculate the potential with power P_desired=30mw. I wonder if this correction makes sense:

U= abs(a_fund-mode + b_fund-mode) * P_desired / P_simulation   *    [Ex * conj(Ex) + Ey * conj(Ey) + Ez * conj(Ez) ] 

[Guilin Sun]

 

U= Ex * conj(Ex) + Ey * conj(Ey) + Ez * conj(Ez)

is the Poynting vector along z axis;

 P_desired / P_simulation   *    [Ex * conj(Ex) + Ey * conj(Ey) + Ez * conj(Ez) ] 

seems reasonable. however

 abs(a_fund-mode + b_fund-mode) * P_desired / P_simulation   *    [Ex * conj(Ex) + Ey * conj(Ey) + Ez * conj(Ez) ] 

is not reasonable, since a and b are  the transmission/reflection complex coefficients and they usually do not work to be summed up and apply to power quantities.

Please check your original idea of “potential”: what exactly does it mean in math expression in physics?

 

 

[Z.Shahrabifarahani]

Hi, I need to apologize and correct my definitation for potential:

alpha is the polarizability of atomic system. I got the components of electric field for my desired mode from the mode expansion monitor. Just to correct the portion of power carried by this mode, I used a and b coefficients.

[Guilin Sun]

a and b coefficients are not the full description of the power portion. please refer to this article:

https://optics.ansys.com/hc/en-us/articles/360034902433-Using-and-understanding-Mode-Expansion-Monitors

you have all the results you need from the simulaiton. Hopefully you can get your desired result.