Learning Forum

[Connor Heimig]

I am currently simulating a chiral nanostructure in FDTD, mainly focussing on the farfield response, which works fine. 

I now want to simulate/access the chiral nearfields, aiming to calculate the optical chirality enhancement Ĉ of my structure.

An example for this optical chirality enhancement Ĉ can be found here: Figure 3 in https://doi.org/10.1021/acsphotonics.6b00147 :

Here, the optical chirality enhancement Ĉ is calculated as:

As this is hardly a novel concept, I was hoping that Lumerical already has built in commands for extracting these complex nearfields or - even better - the optical chirality enhancement Ĉ, directly. If not, some pointers as to how to best extract these fields in order to calculate the optical chirality enhancement Ĉ would be appreciated.

Thanks!

 

 

 

[Guilin Sun]

Currently you can export E and H fields directly from the monitor, by using script like this:

E=getresult("monitor","E");

H=getresult("monitor","H");

Ex=E.Ex;

Ey=E.Ey;

Ez=E.Ez;

Hx=H.Hx.

Hy=H.Hy;

Hz=H.Hz;

Bx=Hx*mu0;

etc then do the cauculation.

Please try and let me know if you have questions.

[Connor Heimig]

Hi Guilin,

thanks for the answer! 

While I was aware of the scripting language to extract fields, I am still not sure whether these are the scalar or the complex fields. 

Maybe you can provide some further insight here.

Thanks in advance. 

[Guilin Sun]

The frequency-domain result from a monitor is complex, and vectoral since it has 3 components.