Excitación de SPPs (Surfaceplasmons polaritons)

The existence of this resonance is based on a unique and simple opticalphenomenon. In this phenomenon, the collective coherent oscillations of freeelectrons in the conduction band of a metal is first excited by the interactiveelectromagnetic field at a metal/dielectric interface and these created chargedensity oscillations are called surface plasmon polaritons (SPPs). The SPPs willthen form an electric field that exponentially decays into its surrounding mediumwith a penetration depth in hundreds of nanometers range.

Excitación de SPPs (Surfaceplasmons polaritons)

dm

dmspp kk

0

kt

dm

dmspp kk

0

sppt kRek

pdm

dmspp Arc

sin

2

0 Re2 d

dmd

Skin depth 2

0

Re

Re2 m

dmm

Radio-Frequency module:Problemas 2D

Radio-Frequency module:Problemas 2D

Radio-Frequency module:Problemas 2D

dw

1h1

2h

3h3

2

Radio-Frequency module:Problemas 2D

Radio-Frequency module:Problemas 2D

Radio-Frequency module:Problemas 2D

wd= 400 [nm]

Radio-Frequency module:Problemas 2D

Radio-Frequency module:Problemas 2D

dw

1h1

2h

3h

4 4h

2

3

Radio-Frequency module:Problemas 2D

Otra posibilidad para excitar SPPs es mediante el uso de redes de difracción

incidentexmxmt kmd

kk ,,,

2

El número de onda transversal de los ordenes superiores viene dado por:

Radio-Frequency module:Problemas 2D

Radio-Frequency module:Problemas 2D

Incorporaremos PMLs

dw

1h2/dw

PML

Radio-Frequency module:Problemas 2D

2h

3h

4h

PML

PML

dw

Disolución

Radio-Frequency module:Problemas 2D

PML

Disolución

Sustrato

Ag

1h

4h

3h2h