Kang Xue-Liang, Li Yong-Ping, Qiu Shan-Liang, Cai Jia-Xing
Key Laboratory of Quantum Information, Chinese Academy of Science, Hefei, 230026, China.
Opt Express. 2009 Dec 21;17(26):23843-50. doi: 10.1364/OE.17.023843.
Spectrum control by anisotropy in a cylindrical microcavity made of electric anisotropic medium was studied. A finite-difference time domain method for electric anisotropic medium and Volume-average Effective Permittivity approximation are applied to calculate the resonant frequencies and quality factors of Whispering-gallery modes. The resonant frequency for different whispering-gallery modes has a similar shift in direct proportion to the relative difference of two principal refractive indices. The quality factors decay exponentially due to directional emission when the difference of two principal refractive indices increases. This novel tuning characteristic of anisotropic cylindrical microcavity will play an important role in many areas, such as light source with tunable wavelength, tunable filter and sensor.
研究了由电各向异性介质制成的圆柱形微腔中各向异性对光谱的控制。采用电各向异性介质的时域有限差分法和体积平均有效介电常数近似法来计算回音壁模式的共振频率和品质因数。不同回音壁模式的共振频率有类似的偏移，与两个主折射率的相对差值成正比。当两个主折射率的差值增大时，由于定向发射，品质因数呈指数衰减。这种各向异性圆柱形微腔的新型调谐特性将在许多领域发挥重要作用，如波长可调谐光源、可调谐滤波器和传感器等。
