title: Directional emission from ZnO hexagonal disks.
abstract: Lots of theories and experiments have so far tried to acquire the directional emission with whispering-gallery modes (WGMs) from micro- and nanostructures, which will enhance the applications of micro- and nanoscaled whispering-gallery resonators in optoelectronic devices. Here for the first time we report a series of directional emission patterns with WGMs from the single ZnO hexagonal micro- and nanodisk. Based on the cathodeluminescence technique, we observed far-field emissions from ZnO hexagonal micro- and nanodisks in four geometries with different deformations. Mechanisms of directional emissions above were suggested. These investigations facilitated the applications of ZnO hexagonal micro- and nanodisks in photonic devices.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics & Engineering, Sun Yat-sen University , Guangzhou 510275, Guangdong, P. R. China.
authors.forename: Haimei
authors.initials: H
authors.lastname: Dong
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Yang
authors.forename: Guowei
authors.initials: G
authors.lastname: Yang