Fano lineshapes and electro-magnetically induced transparency-like peaks in the transmittance of a transverse electric polarization silicon-on-insulator symmetric meandering distributed feedback photonic structure are demonstrated. The coupling constants at the five identical directional couplers are varied to obtain the desired spectral responses. The numerically simulated and experimentally measured transmittance spectra are in good agreement with each other. The numerically calculated and experimentally measured insertion loss for the symmetric meandering distributed feedback structure with directional coupler coupling length Lc = 10 μm are respectively −5 dB and −17 dB, including the grating couplers. Fano lineshapes with mode splitting is observed at directional coupler coupling constant value C of 0.24. For coupling constant value of C ∼ 0.78, electro-magnetically induced transparency-like peaks are observed, and spectrally adjusted by varying the directional coupler coupling length. Fano lineshapes show an extinction ratio of more than 26 dB and slope ratio of 368 dB/nm. Electro-magnetically induced transparency-like peaks show a quality-factor on the order of 5 × 104. The symmetric meandering distributed feedback structure shows promise for possible applications as an optical switch, and an optical filter in wavelength division multiplexing and data networks, as well as optical sensors in optical diagnostics, using silicon photonics.

中文翻译：

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硅光子电路的对称曲折分布反馈结构

证明了横向电极化绝缘体上硅对称蜿蜒分布反馈光子结构的透射率中的 Fano 线形和电磁感应透明状峰值。改变五个相同定向耦合器的耦合常数以获得所需的光谱响应。数值模拟和实验测量的透射光谱相互吻合。对于定向耦合器耦合长度 Lc = 10 μm 的对称蜿蜒分布反馈结构，数值计算和实验测量的插入损耗分别为 -5 dB 和 -17 dB，包括光栅耦合器。在定向耦合器耦合常数 C 为 0.24 时观察到具有模式分裂的 Fano 线形。对于耦合常数值 C ∼ 0。如图 78 所示，观察到电磁感应透明状峰值，并通过改变定向耦合器耦合长度来调整光谱。Fano 线形显示超过 26 dB 的消光比和 368 dB/nm 的斜率比。电磁感应透明状峰显示出 5 × 104 数量级的品质因数。对称蜿蜒分布反馈结构显示出作为光开关的可能应用的前景，以及波分复用和数据网络中的光滤波器，如以及使用硅光子学的光学诊断中的光学传感器。