Modes in equilateral triangle resonator (ETR) are analyzed and classified according to the irreducible representations of the point group C-3v., Both the analytical method based on the far field emission and the numerical method by FDTD technique are used to calculate the quality factors (Q-factors) of the doubly degenerate states in ETR. Results obtained from the two methods are in reasonable agreement. Considering the different symmetry properties of the doubly degenerate eigenstates, we also discuss the ETR joined with an output waveguide at one of the vertices by FDTD technique and the Pade approximation. The variation of Q-factors versus width of output waveguide is analyzed. The numerical results show that doubly degenerate eigenstates of TM0.36 and TM0.38 whose wavelengths are around 1.5 mu m in the resonator with side-length of 5 mu m have the Q-factors larger than 1000 when the width of the output waveguide is smaller than 0.4 mu m. When the width of the output waveguide is set to 0.3 mu m, the symmetrical states that are more efficiently coupled to output waveguide have Q-factors about 8000, which are over 3 times larger than those of asymmetric state.
会议名称:
Conference on Semiconductor and Organic Optoelectronic Materials and Devices
会议文集:
SEMICONDUCTOR AND ORGANIC OPTOELECTRONIC MATERIALS AND DEVICES丛书标题: PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
Chen, Q; Huang, YZ; Guo, WH .Influence of mode symmetry on quality factors of degenerate states in microlasers with an equilateral triangle resonator .见：SPIE-INT SOC OPTICAL ENGINEERING .SEMICONDUCTOR AND ORGANIC OPTOELECTRONIC MATERIALS AND DEVICES丛书标题: PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) ,1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA ,2005,5624: 504-514
