PT symmetry breaking in optical systems

Ricvil
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There are very results published about PT symmetry breaking in optical systems, with effects like anysotropical transmission resonance in waveguides.
But if PT symmetry is broken in a optical system and CPT symmetry must always be respected, then what C symmetry is broken in a optical system?
 
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Do you have a reference?
I guess the breaking is related to material properties - the material does not have to be symmetric. Exact T transformation would mean you have to replace matter-waveguides by antimatter-waveguides - I doubt they did that!
 
A matter effect. The matter is not symmetric, there is no PT violation on a fundamental level.
 

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