Aktivitet: Foredrag og mundtlige bidrag › Konferenceoplæg
Organic semiconductors have several advantages over their inorganic counterparts such as tunability of their properties via chemical synthesis of appropriate molecular building blocks. For example, para-hexaphenylene (p6P) molecules can self-assemble via vapour deposition onto a muscovite mica substrate to form crystalline either straight nanofibers or nanofiber rings. Such p6P nanofibers have peculiar optoelectronic properties such as a blue, polarized photoluminescence output and the ability to act as optical waveguides. Waveguiding p6P rings would be of particular interest as they could be used in compact integrated nanophotonic circuits. Compared to straight nanofiber growth, the formation of nanofiber rings requires an additional treatment of the mica substrate with water prior to deposition of the molecules. Here we demonstrate for the first time the formation of microrings with diameters above 10 µm. We find that p6P rings with a large cross-section support waveguiding through a 360° bend nanofiber structure (microring) and we study their optical characteristics.