Method for forming a structural body and an apparatus for forming a structural body

Abstract

A method for forming a structural body includes irradiating a substrate with light having a periodic intensity distribution and a wavelength within a wavelength region which allows the substrate to show opacity thereby forming a periodic structure causing optical diffraction on a surface of the substrate.

1 . A method for forming a structural body, comprising:
 irradiating a substrate with light having a wavelength within a wavelength region which allows the substrate to show opacity thereby forming a periodic structure causing optical diffraction on a surface of the substrate.   
     
     
         2 . The method for forming a structural body according to  claim 1 , wherein the light to be irradiated to the substrate has a periodic intensity distribution. 
     
     
         3 . The method for forming a 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. 
     
     
         4 . The method for forming a structural body according to  claim 2 , wherein the periodic structure formed on the surface of the substrate has a regular arrangement which develops a structural color. 
     
     
         5 . The method for forming a structural body according to  claim 1 , wherein the periodic structure causing optical diffraction is formed on a part or a whole of the surface of the substrate. 
     
     
         6 . The method for forming a structural body according to  claim 2 , wherein the periodic structure causing optical diffraction is formed on a part or a whole of the surface of the substrate. 
     
     
         7 . The method for forming a structural body according to  claim 3 , wherein the periodic structure causing optical diffraction is formed on a part or a whole of the surface of the substrate. 
     
     
         8 . The method for forming a structural body according to  claim 2 , wherein the light comprises a plurality of light beams intersected with each other, and
 the periodic intensity distribution changes by changing a number, an intersecting direction, an intersecting angle, and a wavelength of the plurality of light beams to form the periodic structure.   
     
     
         9 . An apparatus for forming a structural body for irradiating a substrate with light, comprising:
 a laser oscillator adjusting irradiation pulse number and/or laser output such that a periodic structure causing optical diffraction is formed on a surface of the substrate.