Li Ruifei, Zhou Linjie, Xie Jingya, Xie Anbang, Chen Jianping
Appl Opt. 2015 Dec 1;54(34):10207-12. doi: 10.1364/AO.54.010207.
We present the theoretical analysis and experimental demonstration of adiabatic microring resonators. The resonators are halfway between microdisk and microring preserving the good properties of both the microdisk (high Q-factor) and the microring (internal mode rejection). Device modeling based on the coupled-mode theory suggests that both the internal and external decay rates should be low in order to obtain high-Q and high extinction ratio resonances. The internal decay is modal-order-dependent and significantly affected by the adiabatic tapering rate of the ring waveguide. The external delay is determined by the modal effective index difference between the bus and ring waveguides at the coupling point under a fixed gap. Upon optimization of the resonator system, two resonance modes in the measured device are measured with one possessing a high Q-factor.
我们展示了绝热微环谐振器的理论分析和实验演示。这些谐振器介于微盘和微环之间，兼具微盘（高品质因数）和微环（内部模式抑制）的良好特性。基于耦合模理论的器件建模表明，为了获得高Q值和高消光比的谐振，内部和外部的衰减率都应较低。内部衰减与模式阶数有关，并受到环形波导绝热锥度率的显著影响。外部延迟由固定间隙下耦合点处总线和环形波导之间的模式有效折射率差决定。通过对谐振器系统进行优化，在测量的器件中测量到了两种谐振模式，其中一种具有高Q值。
