Difference between revisions of "Second-order Material Characterization"

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&beta;, the first nonlinear polarizability depends on molecular structure, environment and measurement frequency. There are several tools that help us characterize the materials.
&beta;, 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) ===
[[Hyper Rayleigh Scattering]]
 
Hyper Rayleigh Scattering (aka Harmonic Light Scattering) is one method for measuring &beta;.
 
[[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]]
 
 


[[Teng-Mann Method]]


[[Attenuated_Total_Reflectance]]
[[category:second order NLO]]
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Latest revision as of 11:01, 9 August 2010

Previous Topic Return to Second-order Processes, Materials & Characterization Menu

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

Teng-Mann Method

Attenuated_Total_Reflectance

Previous Topic Return to Second-order Processes, Materials & Characterization Menu
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