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Near‐field optical microscope observation of dye‐containing nano‐domains

A novel method for forming dye‐containing nano‐domains in thin films using a polymer alloy system has been developed. The polymer alloy system (PS‐b‐PMMA), which consists of polystyrene (PS) and polymethyl methacrylate (PMMA), forms microphase separation in thin films. The film was treated using a previously reported technique under vacuum conditions, and an organic dye was selectively dispersed into the PS. Selective association of the dye (diarylethene; cis‐1, 2‐dicyano‐1, 2‐bis (2,4,5‐trimethyl‐3‐thienyl) ethene) with the PS nano‐domains was then observed, with both transmission electron microscopy and scanning near‐field optical microscopy with an absorption spectrum.