To enhance the stability of a material containing pigments in a nonlinear interaction.

A method for spatially imaging a structure of a sample labelled by a certain material at a high resolution makes the selected material migrate from a first state to a second state in a sample region by an optical switching signal. At this time, the defined region is removed intentionally, and optical measurement signal assigned to the material in the first state is recorded in the recorded region, including the region in which the material is migrated to the second region and the region removed intentionally. The material is selected from among a group of materials whose first and second states are distinguished by at least one criterion in an array formed from a steric structure of a molecule, a structural formula of the molecule, a spatial layout of atoms within the molecule, a spatial layout of a bond inside the molecule, a deposition of the other atoms or molecule to a certain molecule, grouping of the atoms and/or the molecule, the spatial orientation of the molecule, mutual orientation of the adjacent molecules, and a plurality of the molecules and/or the atoms. The material exist inside composite nanoparticles.

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