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Dillon Walker
Dillon Walker
Dillon Walker
Dillon Walker
Dillon Walker
Dillon Walker
Dillon Walker
Dillon Walker
Dillon Walker
Dillon Walker
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Dillon Walker

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Hyper-Rayleigh Scattering

Hyper-Rayleigh Scattering

Published in: Education
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  • 1. Dillon Walker, Guangyao Li, Ken Singer Hyper-Rayleigh Scattering NSF Grant DMR-0850037
  • 2. Introduction <ul><li>Fiber-optic cables in data transmission (internet) </li></ul><ul><li>Need to switch light quickly </li></ul><ul><li>Nonlinear optical process </li></ul>
  • 3. Introduction to Nonlinear Optics <ul><li>Nonlinear Effects in All Materials </li></ul><ul><li>Self-interaction of wave through matter </li></ul><ul><li>Need strong coherent light to observe </li></ul><ul><li>Laser is only good light source </li></ul><ul><li>Mode-locked Ti:Sa used in my experiment </li></ul>
  • 4. Hyper-Rayleigh Scattering <ul><li>Technique for measuring second term in </li></ul><ul><li>Third Order Tensor </li></ul><ul><li>Requires non-centrosymmetric molecules </li></ul><ul><li>Frequency doubles </li></ul>Chromo1
  • 5. Hyper-Rayleigh Scattering <ul><li>Material dissolved in solution </li></ul><ul><li>Solutions are symmetric </li></ul><ul><li>Some incoherent scattering </li></ul><ul><li>Collected at 90 degrees </li></ul><ul><li>Very weak signal </li></ul>
  • 6. Multi-Photon Fluorescence <ul><li>Photon energy may be absorbed by electron </li></ul><ul><li>Photons released as electron returns to ground state </li></ul><ul><li>May have same wavelength as Hyper-Rayleigh </li></ul>
  • 7. Fluorescence versus Hyper Rayleigh Hyper Rayleigh Signal Competing Multi-photon Fluorescence Instantaneous Non-Instantaneous
  • 8. Single Photon Counting Technique <ul><li>Fluorescence is not instantaneous </li></ul><ul><li>Time-Resolved Single Photon Counting can be used to distinguish between the two </li></ul><ul><li>Requires thousands of pulses for accuracy </li></ul>
  • 9. Single-Photon Counting Technique <ul><li>Single-Photon detectors have a dead time after each photon detection. </li></ul><ul><li>Can use sync to build a histogram of photon detections after each pulse </li></ul><ul><li>Only works for low detection probabilities </li></ul>2% Chromophore1 in Acetone
  • 10. Setup Photomultiplier PC Photo-detector Sample Beam-splitter Titanium: Sapphire Pump Laser

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