Characterization in Optica/ Materia/s provides information for understanding the properties and performance of optical materials under the influence of the various characterization techniques. Surface and interfacial properties are key to the optical response of a material， and their control and modification during materials processing is necessary to achieve desired behavior. Characterization of Optica/ Materia/s focuses on how surface morphology， microstructure， and chemical bonding influence the optical response of a material， and it illuminates methods used to characterize thin films， multilayer structures， and modified surfaces，