Electro-optic cofficient

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r33 (pronounced "r three three") also called the electro-optic coefficient is a measure of the changability optical activity of a material when an electric field is applied.

r_{33} = \beta(\epsilon,\omega)N<cos^3\theta>\,\!

where

\beta(\epsilon,\omega)\,\! is the molecular first hyperpolarizability which at a give wavelenth ω

N\,\! is chromophore number density

<cos^3\theta>\,\! is the acentricity or order parameter


Figure-of-Merit

Figure-of-merit: r33 preferably > 1000 pm/V

Current Status: 600pm/V

For poled polymers for THz generation and detection

Figure-of-merit: r33 preferably > 350 pm/V

Current Status: 600pm/V


Measurement

Teng-Mann Method

Attenuated Total Reflectance

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