[gpaw-users] Field enhancement

[Tuomas Rossi]

Hi,

The field enhancement is calculated relative to the incident electric 
field strength (see the earlier message). So, as long as you calculate 
with other approaches the field enhancement in the same way, and stay 
within the linear-response regime, then the field enhancements should be 
comparable in principle.

However, for such a comparison, it is important to note that the 
obtained field enhancement values depend on the used broadening 
parameters ("folding" and "width"), analogously to how the spectrum 
depends on them. So, these parameters should be chosen appropriately for 
the comparison to be meaningful.

Best,
Tuomas


On 2016-04-07 19:53, mohamed amin wrote:
> Thank you. I would like to compare the field calculated using 
> classical electrodynamics where the incident field E0=1 with the field 
> calculated in GPAW using TDDFT time propagation. In other words can I 
> assume the incident field in case of the TDDFT equal to 1?
> Thanks again
> Sincerely,
>
> Muhamed Amin
>
>
> On Wednesday, April 6, 2016 2:24 PM, Tuomas Rossi 
> <tuomas.rossi at aalto.fi> wrote:
>
>
> Hi,
>
> The field enhancement is calculated as the total electric field 
> strength divided by the incident electric field strength. In the case 
> of a delta kick, the incident electric field strength is proportional 
> to the kick strength. In the assumed linear response regime the field 
> enhancement should not depend on the used kick strength.
>
> Best,
> Tuomas
>
> On 2016-04-06 14:53, mohamed amin via gpaw-users wrote:
> Dear all,
> In the field enhancement example on the web it shows the field 
> enhancement using a color scale ranging from 0 to 25. However, I think 
> these values is relative to the incident field but I don't know what 
> is the value of the incident field since it is a delta kick. are these 
> values normalized?
> Thanks
> Sincerely,
>
> Muhamed Amin
> < /html>
>
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