Learning Forum

[Debasish Biswasray]

Hi all,

I am using 'Lumerical FDTD' to simulate a structure involving metallic spheres. I observed that when the separation between spheres is decreased, the peak optical absorption gradually redshifts. But when the separation was less than 0.5 nm, the absorption started blueshifting.

This blueshifting for smaller separations is quantum mechanically explained through the tunneling of electrons. I wonder how this tunneling can be explained through classical FDTD simulations.

I want to know whether there is any analogy between quantum mechanics and Lumerical FDTD simulations. Otherwise, can this blueshifting be explained through classical FDTD?

Please help me understand this.

[Niki Papachristou]

Hi Debasish,

Have you come across this article?: Mie scattering (FDTD), I think you will find some useful information there.

Please note that this is the optics forum and not the photonics where lumerical related question are posted. For your next lumerical question please post at: Ansys photonics forum

Kind Regards,

Niki

[Debasish Biswasray]

Thank you for your reply.

I have used the Mie scattering model through Lumerical FDTD and obtained such a result. I will move to the photonics forum.