title: Measurement of the index of refraction of μm crystals by a confocal laser microscope--potential application for the refractive index mapping of μm scale.
abstract: A conventional laser microscope can be used to derive the index of refractivity by the ratio of geometrical height of the transparent platelet to the apparent height of the normal incident light for very small crystals in the wide size range. We demonstrate that the simple method is effective for the samples from 100 μm to 16 μm in size using alkali halide crystals as a model system. The method is also applied for the surface fractured micro-crystals and an inclined crystal with microscopic size regime. Furthermore, we present two-dimensional refractive index mapping as well as two-dimensional height profile for the mixture of three alkali halides, KCl, KI, and NaCl, all are μm in size.
authors.affiliation: Research Center for Micro-Nano Technology, Hosei University, Midori-cho 3-11-15, Koganei-shi, Tokyo 184-0003, Japan.
authors.forename: Keisaku
authors.initials: K
authors.lastname: Kimura
authors.affiliation: Department of Material Science, Graduate School of Material Science, University of Hyogo, Koto 3-2-1, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
authors.forename: Seiichi
authors.initials: S
authors.lastname: Sato