Surface Plasmon Resonance. General Introduction презентация

Октябрь 10, 2021

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Surface Plasmon Resonance. General Introduction

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2. Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: - collective oscillations of the “free electron
3. Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: - collective oscillations of the “free electron
4. Requirements: - Material with free electrons: Pb, In, Hg, Sn, Cd Cu, Ag, Au plasma frequency
5. Requirements: - Material with free electrons: Pb, In, Hg, Sn, Cd Cu, Ag, Au plasma frequency
6. Requirements: - Material with free electrons: Pb, In, Hg, Sn, Cd Cu, Ag, Au plasma frequency
7. Total reflection on a prism θ prism 0 reflectance 1 angle θc θ prism 3
8. Evanescent Wave θ prism evanescent field evanescent wave: - nearfield standing wave, - extends about 1/2
9. Surface Plasmon Resonance θ detector 50 nm Au 0 reflectance 1 angle θc θo 5 (Kretschmann)
10. Surface Plasmon Resonance Spectroscopy θ detector Au analyte 0 reflectance 1 angle θc θo θ1 To
11. Knoll, et.al. Biosensors & Bioelectronics, 1995, 10, 903 Surface Plasmon Resonance Spectroscopy in Sensors 7
12. (Kretschmann) Waveguide coupler Grating coupler Prism coupler Homola, Chem. Rev. 2008, 108, 462 Coupling of Light
13. Nanoparticle Surface Plasmon d λ λ d Nanoparticle 9
14. Eustis and El-Sayed, Chem. Soc. Rev., 2006, 35, 209 Nanoparticle Surface Plasmon d λ λ d
16. Скачать презентацию

Слайд 2

Surface 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.

Слайд 3

Surface 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

Слайд 4

Requirements:
- Material with free electrons:
Pb, In, Hg, Sn, Cd
Cu, Ag,

Au

plasma frequency

UV

VIS

Metals

2

Слайд 5

Requirements:
- 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 6

Requirements:
- 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 7

Total reflection on a prism
θ
prism
0
reflectance
1
angle
θc
θ
prism
3

Слайд 8

Evanescent Wave
θ
prism
evanescent field
evanescent wave: - nearfield standing wave,
- extends about

1/2 λ,
- decays exponentially with the distance

0

reflectance

1

angle

θc

4

Слайд 9

Surface Plasmon Resonance
θ
detector
50 nm
Au
0
reflectance
1
angle
θc
θo
5
(Kretschmann)

Слайд 10

Surface Plasmon Resonance Spectroscopy
θ
detector
Au
analyte
0
reflectance
1
angle
θc
θo
θ1
To measure: - thickness changes,
- density fluctuation,
-

molecular adsorption

6

Слайд 11

Knoll, 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 13

Nanoparticle Surface Plasmon
d
λ
λ
d <<
Nanoparticle
9

Слайд 14

Eustis 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