Temperature dependence of the photoinduced micro-crystalline surface topography of a diaryletheneElectronic supplementary information (ESI) available: estimated crystal shapes from the crystal units of 1o and 1c, DSC curves of the 1st and 2nd heating of 1o with heating rate of 10 K min−1, and XRD spectra of microcrystalline surface of 1o before and after heating processes. See DOI: 10.1039/c3ce41336e

By alternate irradiation with UV and visible light, reversible topographical changes were observed. Step and valley formation while keeping the crystal confinement was observed below the glass transition temperature ( T g ), while crystal growth via a softened state was observed above the T g on the same diarylethene crystalline surface. Step and valley formation was observed below T g , while crystal growth was observed above the T g .