Lecture 12 - Plasmonic Nanostructures in Sensing Molecules

Lecture 12 - Plasmonic Nanostructures in Sensing Molecules...

Info icon This preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Plasmonic Nanostructures in Sensing Molecules
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 Presentation Outline Introduction Surface Plasmon Resonance (SPR) Localized SPR / Nanoshells Surface Enhanced Raman Scattering (SERS) Challenges Conclusions / Summary You are here
Image of page 2
3 Introduction Abundance Variety Precise Control Easy binding to Bio Molecules Sensing Cancer Therapy Promise of more and more advanced applications than conventional techniques: Fluorescence, Chromatography, Mass Spectrometry
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Introduction – Motivation Proc. Nat. Ac. Sci. vol. 97, pp. 996-1001 (2000) Plasmon resonances give specific metallic nanoparticles a strong and well defined color. This effect was already used in the Middle Ages to fabricate stained-glass windows. More recently, plasmon Resonant nanoparticles have been used as biomarkers
Image of page 4
5 Plasma Resonance Single atom 1 2 2 0 p Ne m ω ε = 0 2 = + x x p ω & & ( ) E m e x = & & P E π 4 = Nex P = ω p = plasma frequency γ = restoring force (spring) constant Material Resonance condition Resonance Frequency Bulk Metal Planar Surface Sphere Ellipsoid Plasma resonances for various geometries Optical Properties of Metal Clusters Kreibig and Vollmer,1995 0 eff ε = eff d ε ε = − 2 eff d ε ε = − 1 M eff M L L ε = − p ω 2 p ω 3 p ω p M L ω
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon