Contents: (Advanced Optical Materials 5/2013)

A facile self-assembly method is reported by J. Yao, Y. S. Zhao, and co-workers for the preparation of highquality crystalline microrings from organic molecules.On page 357, they describe how the well-defined ring structures are formed by the ordered packing of molecules around the solution droplets.Fluorescence could be confined as active optical resonance in the ring cavities, providing new opportunities for the fabrication of on-chip photonic elements via molecular assembly approaches. Adaptive MaterialsLabyrinth and checkerboard wrinkle patterns appear in optical micrographs of oxidized poly dimethylsiloxane sheets taken by P. Kim, J. Aizenberg, and co-workers when two orthogonally oriented stresses become vanishingly small.On page 381, vertically and horizontally aligned wrinkle patterns undergo abrupt switching over this narrow 'transition region', and their associated optical diffraction patterns also display the signature of orthogonally oriented domains.Image courtesy of P.