光学微腔中Fano共振的非线性调谐完全交叉
Complete crossing of Fano resonances in an optical microcavity via nonlinear tuning
摘要：
我们报告的建模，仿真和实验演示芯片集成微谐振器内的Fano谐振的完整模式交叉。当腔耦合光泵被材料部分吸收时，通过非线性热光调谐实现了谐振线型的连续整形。然后，局部产生的热产生热场，该热场影响空间重叠的光学模式，从而允许改变共振的相对光谱分离。此外，我们利用这种可调谐性，不断探测不同的家庭之间的耦合表现出不对称的范诺相互作用的准简并模式。作为一个特殊的情况下，我们证明了第一次完全消失的模式特征之一，在透射谱的预测U。Fano [Phys.Rev.124，1866（1961）]。该现象被建模为三阶非线性，其空间分布取决于所存储的光场和谐振器内的热扩散。所进行的非线性数值模拟与实验结果非常吻合，这证实了所开发的理论的有效性。
英文摘要：
We report on the modeling, simulation and experimental demonstration of complete mode crossings of Fano resonances within chip-integrated microresonators. The continuous reshaping of resonant lineshapes is achieved via nonlinear thermo-optical tuning when the cavity-coupled optical pump is partially absorbed by the material. The locally generated heat then produces a thermal field, which influences the spatially overlapping optical modes, allowing thus to alter the relative spectral separation of resonances. Furthermore, we exploit such tunability to probe continuously the coupling between different families of quasi-degenerate modes that exhibit asymmetric Fano-interactions. As a particular case, we demonstrate for the first time a complete disappearance of one of the modal features in the transmission spectrum as predicted by U. Fano [Phys. Rev. 124, 1866 (1961)]. The phenomenon is modeled as a third order non-linearity with a spatial distribution that depends on the stored optical field and the thermal diffusion within the resonator. The performed non-linear numerical simulations are in excellent agreement with the experimental results, which confirm the validity of the developed theory.
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