Sheet of Colloidal Crystals Immobilized in Resin, Method of Displaying Structural Color Using Same, Method for Detecting Unevenness Distribution or Hardness Distribution of Subject Using Same, and Structural Color Sheet

摘要

Provided are: a sheet of colloidal crystals immobilized in resin exhibiting intense structural color, enabled to be observed easily from a squarely facing direction against a surface; and use thereof. The sheet of the present invention, assuming a direction perpendicular to part of a surface of a target area including partially the sheet surface is set as a specified axis, satisfies: (1) The target area includes plural inclined back-reflecting crystal-domains crystal domains having colloid particles immobilized in resin and including crystal lattice planes capable of Bragg-back reflecting at least some of components in a visible wavelength range of incident light having greater than 0 incident angle with the specified axis; and (2) By defining an azimuth angle around the specified axis, the inclined back-reflecting crystal-domains are so oriented that intensity of reflected light caused by Bragg back reflection varies depending on the azimuth angle of the incident light.

主权项

1. A sheet of colloidal crystals immobilized in resin wherein a target area includes at least part of a surface of the sheet of colloidal crystals immobilized in resin and a squarely facing direction that is a perpendicular direction to the surface is defined as a specified axis, the sheet of colloidal crystals immobilized in resin satisfying:
(1) the target area includes a plurality of crystal domains (hereinafter referred to as “inclined back-reflecting crystal-domains”) including colloidal particles immobilized in resin and crystal lattice planes capable of substantially Bragg-back reflecting at least part of components in a visible wavelength range of incident light having an incident angle of greater than 0 formed with the specified axis; and (2) the plurality of inclined back-reflecting crystal-domains are so oriented that, when an azimuth angle is defined around the specified axis, intensity of reflected light caused by the Bragg back reflection varies depending on the azimuth angle of the incident light.