Surface Plasmons Enhanced SHG and SFG

Yi Rao07-15-08

SHG and SFG

ωSF

ωIR

ωVIS

IRVIS

SUMIR

VISInterface

1. Interface-selective

2. Coherent process

Second order process has low yield

Surface Plasmons and SHG

Enhancement factor 104

SHG:

Diffusive

Depolarized

Cu Au

Surface Plasmons and SFG

Local field(Surface plasmon), Interparticle coupling (particle space)

Preliminary Results (SFG)

Future direction

• Enhancement Mechanisms of Enhanced SHG and SFG• Improving enhancement factor• Extend enhancement into more systems

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