STRUCTURAL BODY, A METHOD FOR FORMING A STRUCTURAL BODY AND AN APPARATUS FOR FORMING A STRUCTURAL BODY
Decoration of a material is enabled with a high degree of recycling properties while satisfying the requirements for putting a structural color into practical use on the industrial scale. Furthermore, whether an object is genuine or not can be verified easily, and reusing by peeling as in the case of a hologram seal is prevented. A structural body 10 has a configuration in which a periodic structure 15 causing optical diffraction is formed on part or the whole of the surface of the substrate 11.
1 . A structural body, wherein the periodic structure causing optical diffraction is formed on part or the whole of the surface of a substrate.
2 . The structural body according to claim 1 , wherein the periodic structure formed on the surface of the substrate has a regular arrangement which develops a structural color.
3 . The structural body according to claim 1 , which further comprises a protective layer for protecting the periodic structure formed on the surface of the substrate.
4 . The structural body according to any one of claim 1 , wherein the periodic structure on the surface of the substrate is formed by light irradiation.
5 . The structural body according to claim 4 , wherein the periodic structure on the surface of the substrate is formed by light irradiation which generates a periodic intensity distribution.
6 . A method for forming a structural body which comprises irradiating a substrate with light having a wavelength within a wavelength region which allows the substrate to show opacity to cause optical diffraction on the surface of the substrate.
7 . The method for forming a structural body according to claim 6 , wherein the light to be irradiated to the substrate has a periodic intensity distribution.
8 . An apparatus for forming a structural body for irradiating the substrate with light, which comprises a laser oscillator for adjusting irradiation pulse number and/or laser output such that a periodic structure causing optical diffraction is formed on the surface of the substrate.