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Thread: FT of superhydro layer

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    FT of superhydro layer

    hi all,

    does anyone know how to really measure FT of a super-hydrophobic layer?
    Best regards

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    OptiBoard Professional Mauro.Airoldi's Avatar
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    Ciao Mauro,
    thanks for this, but I am referring to the film thickness, not the contact angle.
    And when I say the film thickness, I am not referring to the thickness that the chamber says it is applying, I would really like to know how thick the layer is that has been applied during the process.
    Many thanks and best regards!

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    The hydro is not a layer as compared to the Si02 layer(s). It is a "mist" that does wear off in time. Contact angle is better measurement of the hydro performance. Keep in mind, hydro can be easily reapplied at any time, but the Si02 cannot.
    I bend light. That is what I do.

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    OptiBoard Professional Mauro.Airoldi's Avatar
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    OptiBoard Professional Mauro.Airoldi's Avatar
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    sorry but I did not understand, to really measure the thickness you would have to evaporate a very high thickness (at least 1/4 lambda), if we suppose the refractive index around 1.31 means at least 100 nm. (see 1st graph capture 2, the blue line is the simulation of the CR39 reflection, the green +15 nm / blue + 30nm / red +100 nm)
    No AR pad gives you a lot of material and in any case the reading errors are very heavy.
    the best solution is to evaporate on a ZrO2 or TiO2 test lens, measure the curve and then evaporate your superhydrophobic. Then compare everything with a Th simulator and get an estimate of the truly evaporated thickness (see capture 3 blue Cr39 +180 nm ZrO2, blue +15 nm TC, green +30 nm) The curves move a lot and therefore your measurement with spectrophotometer is more accurate.
    in this simulation I assumed an index of 1.31 for superhydrophobic CT but some believe it is more correct to use 1.36.
    let me know if I am clear

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    OptiBoard Professional Mauro.Airoldi's Avatar
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    OptiBoard Professional Mauro.Airoldi's Avatar
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    sorry but I got confused, capture 2 is with the ZrO2 and capture 3 is just Cr39 + top coat

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