title: Single Mode ZnO Whispering-Gallery Submicron Cavity and Graphene Improved Lasing Performance.
abstract: Single-mode ultraviolet (UV) laser of ZnO is still in challenge so far, although it has been paid great attention along the past decades. In this work, single-mode lasing resonance was realized in a submicron-sized ZnO rod based on serially varying the dimension of the whispering-gallery mode (WGM) cavities. The lasing performance, such as the lasing quality factor (Q) and the lasing intensity, was remarkably improved by facilely covering monolayer graphene on the ZnO submicron-rod. The mode structure evolution from multimodes to single-mode was investigated systematically based on the total internal-wall reflection of the ZnO microcavities. Graphene-induced optical field confinement and lasing emission enhancement were revealed, indicating an energy coupling between graphene SP and ZnO exciton emission. This result demonstrated the response of graphene in the UV wavelength region and extended its potential applications besides many previous reports on the multifunctional graphene/semiconductor hybrid materials and devices in advanced electronics and optoelectronics areas.
authors.affiliation: †State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.|‡School of Physics and Electromechanical Engineering, Zhoukou Normal University, Zhoukou 466001, China.
authors.forename: Jitao
authors.initials: J
authors.lastname: Li
authors.affiliation: †State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lin
authors.affiliation: †State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Lu
authors.affiliation: †State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Chunxiang
authors.initials: C
authors.lastname: Xu
authors.affiliation: †State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Yueyue
authors.initials: Y
authors.lastname: Wang
authors.affiliation: †State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Zengliang
authors.initials: Z
authors.lastname: Shi
authors.affiliation: †State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Dai
keywords: ZnO; graphene; single-mode lasing; submicron-cavity; whispering-gallery mode