Surface Plasmon Resonance

Surface Plasmon Resonance,
Surface Plasmons:
Plasmons confined to surface (interface) and interact with light resulting in polarities.
Propagating electron density waves occurring at the interface between metal and dielectric.

1. Khalid SaeedLateefAl Badri

2. 
Plasmons: collective
oscillations of the
“free electron gas”
density, often at
optical frequencies.
What is SPR?

3. 
Surface Plasmons:
Plasmons confined to surface (interface) and interact
with light resulting in polarities.
Propagating electron density waves occurring at the
interface between metal and dielectric.
What is SPR?

4. 
Surface Plasmon Resonance:
light (λ) in resonance with surface plasmon
oscillation
What is SPR?

5. 
Typical Signal from SPR Measurement

6. 
Typical Signal from SPR Measurement

7. 
Material Requirements:
-Material with free electrons:
Pb, In, Hg, Sn, Cd
Cu, Ag, Au
plasma frequency
UV
VIS
Metals

8. 
Material Requirements:
-Material with free electrons:

9. 
Material Requirements:
-Surface (interface)(thin layer):
flat surfaces nanoparticles
50 nmAu

10. 
How does SPR work?
This KretschmannExperimental
System uses a metal film thin
enough to monitor the plasmon
A plasmon can be thought of as a
ray of light bound onto a surface -
propagating among the surface
and presenting itself as an
electromagnetic field.

11. 
SPR & Refractive Index
In optics the refractive index or index of
refraction n of an optical medium is a
dimensionless number that describes how
light, or any other radiation, propagates
through that medium.

12. 
Applications of SPR
Physical applications: measure
dielectric properties, adsorption
processes, surface degradation or
hydration of
Thin organic monolayers or
bilayers
Polymer films

13. 
Applications of SPR
Biological applications: as biosensors for
specific biological interactions including
adsorption and desorption kinetics, antigen-
antibody binding and epitope mapping for
determination of
Biomolecularstructure and interactions of
proteins, DNA & Viruses
Lipid Bilayers
Non-specific biomolecularinteractions-
bio-compatibility
Tissue engineering

14. 
SPR imaging apparatus
Reflected light from the
gold surface, containing the
SPR image, is monitored
with a CCD camera.
The angle of incidence can
be changed by rotating the
entire sample assembly.

15. 
Reflection from multi-layers

16. 
Reflection from multi-layers

17. 
Reflection from multi-layers

18. 
Reflection from multi-layers
Forward (SW+) and
backward (SW−) surface
plasmons.
The curve in the third
quadrant is given by
(μ
mε
m)/(μ
dε
d) = −1.

19. 