【摘要】 采用时域有限差分和 Padé近似计算了等边三角形、正方形和平行四边形微谐振腔的模式频率和品质因子 .数值结果表明等边三角形谐振腔中的谐振模式具有较高的品质因子 ,这主要是由于等边三角形谐振腔中的模式在横向上得到了完全的限制 ,而在其它两种谐振腔中 ,模式在横向上只是得到部分限制 .对于边长为 4μm,折射率为 3.2的等边三角形谐振腔 ,发现在 1.5 5 μm波长处的模式品质因子可达 5 .5× 10更多还原

【Abstract】 The mode frequencies and the quality factors for the equilateral triangular resonator (ETR), the square resonator (SR) and the rhombus resonator (RR) are numerically calculated by the finite difference time domain technique and the Padé approximation. The numerical results show that the resonant modes confined in an equilateral triangular cavity have much higher quality factors than those in the square or the rhombus cavities. The modes in the ETR are totally confined in transverse direction while those in the SR and RR are only partly confined. For the ETR with the side length of 4μm and the refractive index of 3 2, the mode quality factor of about 5 5×10 3 at the wavelength of 1 55μm has been obtained.更多还原