Giant Resonance and Anomalous Quality Factor Scaling in Degenerate Band Edge Coupled Resonator Optical Waveguides
Giant Resonance and Anomalous Quality Factor Scaling in Degenerate Band Edge Coupled Resonator Optical Waveguides
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简并带边耦合谐振器光波导中的巨谐振和反常品质因数缩放
DOI：
10.1109/jlt.2018.2822600
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发表时间：
2017
影响因子：
4.7
通讯作者：
F. Capolino
中科院分区：
文献类型：
--
作者：
M. Y. Nada;M. Othman;O. Boyraz;F. Capolino
我们提出了一种新的方案来提高耦合谐振器光波导（CROWs）侧耦合到直波导时在简并带边缘（DBE）附近工作时的质量因子（Q因子）。DBE是一个特殊的简并点，当四个Bloch本征波合并时，不需要损失或增益，从而提供了具有场增强的共振条件以及与这种冻结模式相关的其他独特性质。我们推导了一个解析表达式，描述了DBE处色散图的平坦度，并说明了这与工程质量因素的关系。我们报告了当工作在最接近DBE频率的共振频率时，即使在存在损耗和结构扰动的情况下，由DBE- crow制成的具有环数五次方的腔体的质量因子的异常标度律。值得注意的是，所提出的DBE-CROW的Q因子可以被设计成超过直径等于DBE-CROW总长度的单环谐振器的Q因子；因此，DBE导致整体面积大幅减少。我们还证明了DBE- crow的Q因子缩放在DBE附近对制造公差可能引起的扰动和失调的鲁棒性。本文的研究结果对于提高场幅值到大电平和环形谐振器的Q因子具有重要意义，对于四波混频、Q开关、激光和高灵敏度传感器等各种应用都是非常有益的。
We propose a novel scheme for enhancing the quality factor (Q factor) of coupled resonators optical waveguides (CROWs) side coupled to a straight waveguide when operating near a degenerate band edge (DBE). The DBE is an exceptional point of degeneracy occurring without the need of loss or gain when four Bloch eigenwaves coalesce, providing a resonance condition with field enhancement and other unique properties associated with such frozen mode. We derive an analytic expression that describes the flatness of the dispersion diagram at the DBE and show how this is related to engineering the quality factor. We report an anomalous scaling law of the quality factor for a cavity made of the DBE-CROW with the fifth power of the number of rings when operating at the resonance frequency closest to the DBE frequency, even in the presence of losses and structural perturbations. Remarkably, the Q factor of the proposed DBE-CROW can be engineered to exceed that of a single ring resonator having a diameter equal to the total DBE-CROW length; hence, the DBE leads to an overall huge area reduction. We also demonstrate the robustness of the DBE-CROW's Q factor scaling near the DBE against perturbations and disorders that could arise from tolerances in fabrication. The findings reported in this paper are critical for enhancing field's amplitudes to giant levels and the Q factor of ring resonators, and are very beneficial for various applications including four-wave mixing, Q switching, lasers, and highly sensitive sensors.
影响因子：
64.8
作者：
Chen, Weijian;Ozdemir, Sahin Kaya;Yang, Lan
通讯作者：
Yang, Lan
影响因子：
8.6
作者：
Wiersig, Jan
通讯作者：
Wiersig, Jan