Mode coupling between first- and second-order whispering-gallery modes in coupled microdisks.
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.
Li
Jun-Jie
JJ
College of Information Science and Engineering, Huaqiao University, Quanzhou, Fujian, China.
Wang
Jia-Xian
JX
Huang
Yong-Zhen
YZ