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Surface Plasmon Resonance

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:

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Surface Plasmon Resonance

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  1. Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: -collectiveoscillationsofthe“freeelectrongas”density, often at optical frequencies.

  2. Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: -collectiveoscillationsofthe“freeelectrongas”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.

  3. Surface Plasmon Resonance General Introduction Steffen Jockusch 07/15/07 Plasmons: -collectiveoscillationsofthe“freeelectrongas”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

  4. 2 Requirements: - Material with free electrons: plasma frequency Metals Pb, In, Hg, Sn, Cd UV Cu, Ag, Au VIS

  5. 2 Requirements: - Material with free electrons: plasma frequency Metals Pb, In, Hg, Sn, Cd UV Cu, Ag, Au VIS - Surface (interface): flat surfaces nanoparticles Au 50 nm

  6. 2 Requirements: - Material with free electrons: plasma frequency Metals Pb, In, Hg, Sn, Cd UV Cu, Ag, Au VIS - Surface (interface): flat surfaces nanoparticles Au 50 nm - Light: How to couple the photons to the surface?

  7. 3 Total reflection on a prism  1 reflectance prism 0 c angle  prism

  8. 4 Evanescent Wave  1 reflectance prism 0 c angle evanescent field evanescent wave: - nearfield standing wave, - extends about 1/2 , - decays exponentially with the distance

  9. 5 Surface Plasmon Resonance  detector 1 reflectance Au 0 50 nm c o angle (Kretschmann)

  10. 6 Surface Plasmon Resonance Spectroscopy  detector 1 reflectance Au 0 c angle o 1 analyte To measure: - thickness changes, - density fluctuation, - molecular adsorption

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

  12. 8 Coupling of Light to Surface Plasmon Prism coupler Waveguide coupler Grating coupler (Kretschmann) Homola, Chem. Rev.2008, 108, 462

  13. Nanoparticle Surface Plasmon 9  d <<  Nanoparticle d

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

  15. 10 Surface Plasmon-assisted Spectroscopy Technique Largest enhancement factor 1014 Surface enhanced raman SERS Nie and Emery, Science, 1997, 275, 1102. 104 Surface enhanced IR Tsang, et.al., Phys. Rev. Lett., 1980, 45, 201. SEIRA 104 Sum frequency generation SESFG Baldelli, et.al., J. Chem.Phys., 2000, 113, 5432. 104 Second harmonic generation SESHG Chen, et.al., Phys. Rev. Lett., 1981, 46, 145. Surface enhanced fluorescence ~100 SEF

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