jack swagger writes:
>
>
> Dear MEEP users,
> I am trying to model the Multilayered nanoshell, which
> contains
a metal core, a dielectric silica and the outer metal shell. At 1st, i divide
this complex structure into several parts and calculate its extinction
efficiency. I know from the litrature that if you enclose a silica sphere
inside
a metal shell (single layer nanoshell) then the extinction peaks would be red
shifted. But when i tried to enclose a metal inside a silica shell then i
also obtained a red shifted peak. Can somebody tell me the role of the silica
in
this structure. I mean why the extinction peak is always red shifted. I have
attached a figure with the email, which shows the extinction efficiency of a
single silver sphere and a gold sphere and then enclosing them in a dielectric
silica due to which the extinction peaks red shifted. However, incase of
enclosing the silica inside a metal, we get a larger red shift. But my question
is, why incase of enclosing a metal inside a silica we get a red shift?
>
> Thanks.
>
> BR,
> Jack
>
>
>
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Hi Jack,
Would you mind sharing the code with us?
I think the best way to start analyzing how different materials affect the
extinction would be to calculate it analytically e.g. with the dipole
approximation (cf. "Linear optical properties of gold nanoshells" Averitt et.
al. JOSA B 1999)
cheers,
Phil
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