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.
© 2007 Optical Society of America
Lasers and Laser Optics
Original Manuscript: January 16, 2007
Revised Manuscript: March 30, 2007
Manuscript Accepted: April 1, 2007
Published: May 17, 2007
Jun-Jie Li, Jia-Xian Wang, and Yong-Zhen Huang, "Mode coupling between first- and second-order whispering-gallery modes in coupled microdisks," Opt. Lett. 32, 1563-1565 (2007)