I am trying to simulate the electric field distribution of a AgNP of size 20 nm via excitation at LSPR band by using COMSOL 4.3b. In vacuum my LSPR band at ~ 355 nm, I am getting maximum electric field (E/E0) at the surface is ~12 and it appears the field inside the NP is not zero showing ~5. My interest is to simulate the AgNPs of size 20 nm with background medium of refractive index ~1.62. I am getting maximum field (E/E0) at the surface is ~50 and inside the sphere is ~25. I expected that in both cases inside filed to be zero. I am having doubt with my simulation procedure. Can any clarify these simulations correct or not.
Dear Sudhakar
Attached article may be useful to you, go through it.
My suggestion would be to compare your results with an analytical Mie scattering code. Visit www.scattport.org and choose the code that best suite your needs. Regarding the values of your calculated internal fields, you cannot expect the field to be 0, since the particle size is much smaller than the skin depth. On the contrary for deep subwavelength particles you can expect a uniform internal field.
Best
Giovanni
http://www.scattport.org/
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