Difference between revisions of "Second-order Material Characterization"

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=== Hyper Rayleigh Scattering (HRS) ===
=== Hyper Rayleigh Scattering (HRS) ===


Hyper Rayleigh Scattering (aka Harmonic Light Scattering) is one method for measuring β.


[[Image:Hrs.png|thumb|300px|The Hyper Rayleigh Scattering - Test best schematic]]
An incident laser generates a second harmonic signal, specifically the frequency double signal. This can be related to the beta of the sample using this formula:
:<math>\frac {I_{sample}} {I_{solvent}} =  \frac {N_{sample} \langle \beta^2 _{sample} \rangle  + N_{solvent} \langle \beta^2_{solvent}\rangle}  {N_{solvent} \langle \beta^2_{solvent}\rangle}\,\!</math>
[[Image:Tcp1_chcl3.png|thumb|300px|HRS spectrum for 1.5 &mu;m TCP1 in CHCl<sub>3</sub>]]
See Firestone 2004 <ref>K. A. Firestone, P. Reid, R. Lawson, S. H. Jang, and L. R. Dalton, “Advances in Organic Electro-Optic Materials and Processing,” Inorg. Chem. Acta, 357, 3957-66 (2004)</ref>.
See also [[Density Functional Theory]]
<br clear='all'>


[[Teng-Mann Method for Measuring Electro-optic coefficient]]
[[Teng-Mann Method for Measuring Electro-optic coefficient]]

Revision as of 09:31, 1 October 2009

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Characterization

β, the first nonlinear polarizability depends on molecular structure, environment and measurement frequency. There are several tools that help us characterize the materials.

Hyper Rayleigh Scattering (HRS)

Teng-Mann Method for Measuring Electro-optic coefficient

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