| abstract |
A method of three-dimensionally processing a solid medium such as a resin using excitation light (laser or the like) having two different wavelengths is provided. A method for forming a region in which metal nanoparticles are formed in a solid medium, comprising: (1) two types of solid media containing a precursor of a reducing radical active species and a metal ion or metal complex; Are irradiated with excitation light L1 and excitation light L2 having different wavelengths to form metal nanoparticles in the solid medium, and (2) L1 or L2 is irradiated to the site where the metal nanoparticles are formed, and L1 or A method of forming a region, a cavity or a tunnel in which metal nanoparticles are formed toward an incident direction of L2. [Selection] Figure 6 |