An apparatus comprising a first core layer having a first thickness and a first refractive index; a second core layer formed on the first core layer, the second core layer having a second thickness and a second refractive index; and a grating formed at the interface between the first core layer and the second core layer. Corresponding process and system embodiments are disclosed and claimed.

 
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> Injection mold for light guide body and apparatus for manufacturing light guide body using same

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