title: Mode coupling between first- and second-order whispering-gallery modes in coupled microdisks.
abstract: The mode characteristics for two coupled microdisks are investigated by the finite-difference time-domain technique. In the two coupled micodisks, mode coupling between the same order whispering-gallery modes (WGMs) results in coupled WGMs with split mode wavelengths. The numerical results show that the split mode wavelengths of the coupled first- and second-order WGMs can have a crossing point in some cases, which can induce anticrossing mode coupling between them and greatly reduce the mode Q factor of the coupled first-order WGMs. The time variation of mode field pattern shows the transformation between the coupled first- and second-order WGMs.
authors.affiliation: College of Information Science and Engineering, Huaqiao University, Quanzhou, Fujian, China.
authors.forename: Jun-Jie
authors.initials: JJ
authors.lastname: Li
authors.forename: Jia-Xian
authors.initials: JX
authors.lastname: Wang
authors.forename: Yong-Zhen
authors.initials: YZ
authors.lastname: Huang