Transcript Slide 1

Computer Simulation of Surface Plasmon Resonance in Metal Nanoparticles
Warren Mar
PI: Edward T. Yu
in collaboration with: Swee-Hoe Lim, Daniel Derkacs, and Bin Feng
Electrical Engineering, UCSD, La Jolla, CA 92093
[email protected]
[email protected]
Finite Element Modeling
Space is broken up into
tetrahedrons. This enables the use
of less elements for less important
areas and more elements for the
resonance effect.
Plasmon Resonance
The incident electromagnetic radiation is coupled to
vibrations of the electron gas in the metal
nanoparticles. At resonance this effect produces strong
electric fields near the particle.
Simulation Methodology
The simulations utilize a linearly polarized
plane wave at normal incidence. The
metal is modeled by a complex frequency
dependent dielectric function, whereas
the substrate is treated as a simple
dielectric.
Substrate
Nanoparticle Enhancement
Normally the incident light shining on a
silicon substrate gets reflected and only
a portion makes it into the substrate.
The strength of the flied in the substrate is
strengthen by the resonance effect in the metal
nanoparticle.
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Results
Future
The 3D simulations successfully simulated the
plasmon resonance response in freespace. Placing
a metal nanoparticle on top of a silicon substrate
focuses the field near the substrate and this strong
field penetrates into the substrate. Many factors,
such as material, size, and shape affect the field
profile in the substrate.
Novel optical electronic devices can be designed to take advantage of this
effect. Knowing the field profile will aid in optimizing device characteristics for
specific applications. One promising application is utilizing nanoparticles to
increase the performance of solar cells.