Troia Benedetto, Penades Jordi Soler, Qu Zhibo, Khokhar Ali Z, Osman Ahmed, Wu Yangbo, Stirling Callum, Nedeljkovic Milos, Passaro Vittorio M N, Mashanovich Goran Z
Appl Opt. 2017 Nov 1;56(31):8769-8776. doi: 10.1364/AO.56.008769.
We present ring resonator (RR)-coupled Mach-Zehnder interferometers (MZIs) based on silicon-on-insulator rib waveguides, operating around the mid-IR wavelength of 3.8 μm. A number of different photonic integrated devices have been designed and fabricated experimentally to obtain the asymmetric Fano resonances in the mid-IR. We have investigated the influence of the coupling efficiency between the RR and the MZI as well as the phase shift between the two arms of the MZI on the Fano-type resonance spectral features, in agreement with theoretical predictions. Finally, wavelength-dependent Fano transmittances have been successfully measured with insertion losses up to ∼1 dB and extinction ratios of ∼20 dB. A slope of sharp Fano resonances as high as -574.6/μm has been achieved and estimated to be 35.5% higher than the slope of single RR Lorentzian-type resonances.
我们展示了基于绝缘体上硅肋波导的环形谐振器（RR）耦合马赫曾德尔干涉仪（MZI），其在3.8μm的中红外波长附近工作。已经设计并通过实验制造了许多不同的光子集成器件，以在中红外波段获得非对称法诺共振。我们研究了RR与MZI之间的耦合效率以及MZI两臂之间的相移对法诺型共振光谱特征的影响，这与理论预测一致。最后，成功测量了波长相关的法诺透射率，插入损耗高达约1dB，消光比约为20dB。已经实现了高达-574.6/μm的尖锐法诺共振斜率，估计比单个RR洛伦兹型共振的斜率高35.5%。
