Attenuated Total Reflection (ATR)

Attenuated Total Reflection or ATR is a technique used together with Teng Mann to measure the R33 of electro-optic materials. A beam of IR light is directed through a prism at an angle exceeding the critical angle for internal reflection. This produces an evanescent wave at the prism surface. If a EO polymer is pressed in intimate contact with the prism they can be coupled so that he evanescent wave stimulates emission from the sample. This emission is measured with a photodiode. An electric field applied to an EO polymer changes its index of refraction which alters the critical angle.
(This video is a combined version of what was formerly a 2-part series.)
More information on the CMDITR wiki:
photonicswiki.o...

[@kremesti]

this is insane physics

[@katasatrio]

it's very interesting.... i'm in SPR research, and in progress to build the system for automatic detector. so how you change the laser degrees without goniometer ?

[@StainedHumanity1]

Can you explain what "distance normal to the optical interface" is in plainer english?

[@saeidmirzaei4978]

Thanks a lot
How can I downlod This video