Concept of optical channel as a guide for tuning the optical properties of insulating materials

The utility of the concept of optical channel in understanding the optical properties of insulating materials was briefly reviewed by considering how the indices of refraction n of the seven TiO2 allotropes, TiOF2, TiF4 and the binary compounds MQ (M = Zn, Cd; Q = O, S, Se, Te) are related to their total absorption power per formula unit I(ɛ2) × V and their formula unit volume V. Important factors governing the optical properties of insulating materials are discussed.

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