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 Saeed Lateef Al 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 Kretschmann Experimental
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
 Biomolecular structure and interactions of
proteins, DNA & Viruses
 Lipid Bilayers
 Non-specific biomolecular interactions-
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
(μmεm)/(μdεd) = −1.

19. 