Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: - collective oscillations of the “free electron gas” density, often.

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Presentation transcript:

Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: - collective oscillations of the “free electron gas” density, often at optical frequencies.

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 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 ( ) in resonance with surface plasmon oscillation

Requirements: - Material with free electrons: Pb, In, Hg, Sn, Cd Cu, Ag, Au plasma frequency UV VIS Metals 2

Requirements: - Material with free electrons: Pb, In, Hg, Sn, Cd Cu, Ag, Au plasma frequency UV VIS Metals - Surface (interface): flat surfacesnanoparticles 50 nm Au 2

Requirements: - Material with free electrons: Pb, In, Hg, Sn, Cd Cu, Ag, Au plasma frequency UV VIS Metals - Surface (interface): flat surfacesnanoparticles 50 nm Au 2 - Light: How to couple the photons to the surface?

Total reflection on a prism  prism 0 reflectance 1 angle cc  prism 3

Evanescent Wave  prism evanescent field evanescent wave: - nearfield standing wave, - extends about 1/2, - decays exponentially with the distance 0 reflectance 1 angle cc 4

Surface Plasmon Resonance  detector 50 nm Au 0 reflectance 1 angle cc oo 5 (Kretschmann)

Surface Plasmon Resonance Spectroscopy  detector Au analyte 0 reflectance 1 angle cc oo 11 To measure: - thickness changes, - density fluctuation, - molecular adsorption 6

Knoll, et.al. Biosensors & Bioelectronics, 1995, 10, 903 Surface Plasmon Resonance Spectroscopy in Sensors 7

(Kretschmann) Waveguide coupler Grating coupler Prism coupler Homola, Chem. Rev. 2008, 108, 462 Coupling of Light to Surface Plasmon 8

Nanoparticle Surface Plasmon d d << Nanoparticle 9

Eustis and El-Sayed, Chem. Soc. Rev., 2006, 35, 209 Nanoparticle Surface Plasmon d d << Nanoparticle Light resonance with the surface plasmon oscillation causes the free electrons in the metal to oscillate. 9

Surface Plasmon-assisted Spectroscopy Surface enhanced IR Surface enhanced raman Largest enhancement factor Tsang, et.al., Phys. Rev. Lett., 1980, 45, 201. Technique Second harmonic generation Sum frequency generation 10 4 Baldelli, et.al., J. Chem.Phys., 2000, 113, Chen, et.al., Phys. Rev. Lett., 1981, 46, 145. SEIRA SERS SESHG SESFG Nie and Emery, Science, 1997, 275, Surface enhanced fluorescence ~100 SEF