i am doing indium oxide thin film by resistive heat method.
now looking for a anti-reflection coating in VU region only.can anybody tell me, how i can get transmittance only in the visible region (ie,anti reflection coating in VU region) for indium oxide(not in ITO). from the deposition i got the transmittance till IR. for that what i have to do?
Hi Ali,
I 'll try in a first step to precise the question:
- if you want to have transmittance only in the visible region, you need to reflect maximally in the UV and IR region right? (i.e you want to have a filter) ?
what do you think about some semiconductor materials like TiO2 or ZnO?
They absorb UV light and transmit visible spectrum of light.
2 options:
- absorb the UV as proposed by Amir : TiO2 is good because it is more transparent than ZnO (higher band-gap, ZnO can give you a yellowish coloration) and reflect the IR
- reflect UV and IR: again TiO2, or multiples layers TiO2/SiO2
in both case, you have to do intereferential optics simulation to adjust the thicknesses of each layer.
Is optics the only one function you need (for example, no need of protection ? I think In2O3 is sensible to humidity ? )
Choicie of the solution will also depend on your process, because it influences the possibility to have one material or the other, and the ability to control at +/- 1 nm the thickness or not .
I would recommand to specify: what is the precise spectra you want to reach (or which value of transmissivity in the different regions) ?
If you don't have done it yet: make the optical spectrum of your current films (transmissivity and reflectivity)
Depending on your deposition process: make the list of the materials available (among materials transparent in the visible, there shouldn't be that much)
use an interferential optics software to see the performances achievable with those materials, or combination of those as well as the thickness required.
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