Abstract
Mode characteristics for equilateral triangles, squares, and hexagonal resonators with a center hole are numerically simulated by the finite-different time domain (FDTD) technique. The center hole does not break the symmetry behavior of the original resonators and can result in modification of the mode field patterns and mode Q factors. In an equilateral triangle resonator the center hole can suppress the symmetry state of degenerate states with the merit of single mode operation. In a square resonator, the Q factor can be enhanced for some modes with a suitable size of the hole. For a hexagonal resonator with a side length of and a refractive index of 3.2, the mode Q factors first gradually decrease with the increase of the hole diameter for modes at a wavelength of about , then the modes transform to that of a microdisk with a jump of the mode wavelength as the hole diameter approaches . Finally, the mode Q factors greatly enhance as the hole diameter reaches about . The results indicate that the center hole can greatly modify mode characteristics, especially that of the mode Q factor.
© 2009 Optical Society of America
Full Article | PDF ArticleMore Like This
Yue-De Yang, Shi-Jiang Wang, and Yong-Zhen Huang
Opt. Express 17(25) 23010-23015 (2009)
Gary M. Wysin
J. Opt. Soc. Am. B 23(8) 1586-1599 (2006)
Shi-Jiang Wang, Yong-Zhen Huang, Yue-De Yang, Jian-Dong Lin, Kai-Jun Che, Jin-Long Xiao, and Yun Du
J. Opt. Soc. Am. B 27(4) 719-724 (2010)