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one way filter

one way filter

one way filter

(OP)
Hi,
    I was wondering if anybody knew of a filter that allows light to pass through it only one way. From the other side, the surface of the filter is shiny so light reflects off of it. Ideally, almost all of the light would be able to pass through it from one side and almost all of the light would reflect off of it from the other side. Thanks, Tom

RE: one way filter

Perhaps you are thinking of the "two way" mirrors as seen on TV? They are called Mirropane and are made by Pilkington. They are not fully reflective and they do not pass all the light from the back side. Since you didn't specify wavelength or application I'll assume visible light and for viewing. Other than that, what IRStuff said....

http://www.pilkington.com/applications/products2006/englishusa/bybenefit/specialapplications/mirropane/default.htm

Harold
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RE: one way filter

This is usually done using a polarization-specific thin film mirror (TFP).  Light from one direction has its polarization rotated via half-wave mirror (or quarter-wave if you're worried about transmission and then reflection), pockels cell, etc and is reflected by the mirror.  Light from the other direction is allowed to transmit through the filter.  In this way, you're setting up a reflecting optical isolator.  Of course, this requires that the incoming light be polarized.  

There are different methods of creating optical isolators. Do some research on optical isolators and you should be able to find one that best suits your light source and system.  
 

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