collective oscillations of the “free electron gas” density, often at optical frequencies.
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Surface Plasmon Resonance. General Introduction презентация
Содержание
- 1. Surface Plasmon Resonance. General Introduction
- 2. Surface Plasmon Resonance General Introduction Steffen Jockusch
- 3. Surface Plasmon Resonance General Introduction Steffen Jockusch
- 4. Requirements: - Material with free electrons:
- 5. Requirements: - Material with free electrons:
- 6. Requirements: - Material with free electrons:
- 7. Total reflection on a prism θ
- 8. Evanescent Wave θ prism
- 9. Surface Plasmon Resonance θ
- 10. Surface Plasmon Resonance Spectroscopy θ
- 11. Knoll, et.al. Biosensors & Bioelectronics, 1995, 10, 903 Surface Plasmon Resonance Spectroscopy in Sensors 7
- 12. (Kretschmann) Waveguide coupler Grating coupler Prism coupler
- 13. Nanoparticle Surface Plasmon d λ λ d
- 14. Eustis and El-Sayed, Chem. Soc. Rev., 2006,
- 15. Surface Plasmon-assisted Spectroscopy Surface enhanced IR Surface
Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: - collective oscillations of the “free electron gas” density, often at optical frequencies. Surface
Слайд 2Surface Plasmon Resonance
General Introduction
Steffen Jockusch
07/15/07
Plasmons:
-
collective oscillations of the “free electron gas” density, often at optical frequencies.
Surface Plasmons:
- plasmons confined to surface (interface) and interact with light resulting in polaritons.
- propagating electron density waves occurring at the interface between metal and dielectric.
Surface Plasmons:
- plasmons confined to surface (interface) and interact with light resulting in polaritons.
- propagating electron density waves occurring at the interface between metal and dielectric.
Слайд 3Surface Plasmon Resonance
General Introduction
Steffen Jockusch
07/15/07
Plasmons:
-
collective oscillations of the “free electron gas” density, often at optical frequencies.
Surface Plasmons:
- plasmons confined to surface (interface) and interact with light resulting in polaritons.
- propagating electron density waves occurring at the interface between metal and dielectric.
Surface Plasmon Resonance:
- light (λ) in resonance with surface plasmon oscillation
Surface Plasmons:
- plasmons confined to surface (interface) and interact with light resulting in polaritons.
- propagating electron density waves occurring at the interface between metal and dielectric.
Surface Plasmon Resonance:
- light (λ) in resonance with surface plasmon oscillation
Слайд 4Requirements:
- Material with free electrons:
Pb, In, Hg, Sn, Cd
Cu, Ag,
Au
plasma frequency
UV
VIS
Metals
2
Слайд 5Requirements:
- Material with free electrons:
Pb, In, Hg, Sn, Cd
Cu, Ag,
Au
plasma frequency
UV
VIS
Metals
- Surface (interface):
flat surfaces
nanoparticles
50 nm
Au
2
Слайд 6Requirements:
- Material with free electrons:
Pb, In, Hg, Sn, Cd
Cu, Ag,
Au
plasma frequency
UV
VIS
Metals
- Surface (interface):
flat surfaces
nanoparticles
50 nm
Au
2
- Light: How to couple the photons to the surface?
Слайд 8Evanescent Wave
θ
prism
evanescent field
evanescent wave: - nearfield standing wave,
- extends about
1/2 λ,
- decays exponentially with the distance
- decays exponentially with the distance
0
reflectance
1
angle
θc
4
Слайд 10Surface Plasmon Resonance Spectroscopy
θ
detector
Au
analyte
0
reflectance
1
angle
θc
θo
θ1
To measure: - thickness changes,
- density fluctuation,
-
molecular adsorption
6
Слайд 11Knoll, et.al. Biosensors & Bioelectronics, 1995, 10, 903
Surface Plasmon Resonance Spectroscopy
in Sensors
7
Слайд 12(Kretschmann)
Waveguide coupler
Grating coupler
Prism coupler
Homola, Chem. Rev. 2008, 108, 462
Coupling of
Light to
Surface Plasmon
8
Слайд 14Eustis and El-Sayed, Chem. Soc. Rev., 2006, 35, 209
Nanoparticle Surface
Plasmon
d
λ
λ
d <<
Nanoparticle
Light resonance with the surface plasmon oscillation
causes the free electrons in the metal to oscillate.
9
Слайд 15Surface Plasmon-assisted Spectroscopy
Surface enhanced IR
Surface enhanced raman
Largest enhancement factor
1014
Tsang, et.al., Phys.
Rev. Lett., 1980, 45, 201.
Technique
10
104
104
Second harmonic generation
Sum frequency generation
104
Baldelli, et.al., J. Chem.Phys., 2000, 113, 5432.
Chen, et.al., Phys. Rev. Lett., 1981, 46, 145.
SEIRA
SERS
SESHG
SESFG
Nie and Emery, Science, 1997, 275, 1102.
Surface enhanced fluorescence
~100
SEF
