FSR-Free Fano Resonance in a Photonic Molecule With Dual Side-Coupled Phase-Shifted Bragg Gratings

IF 2.4 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2026-03-04 DOI:10.1109/LPT.2026.3670303

Yong Zhao;Yuechun Shi;Yuxuan Chen;Jiaqiang Nie

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引用次数: 0

Abstract

Fano-resonant photonic molecules hold great promise for ultra-compact optical filtering and sensing, yet their performance is usually limited by the free-spectral-range (FSR) of the resonators. In this letter, we demonstrate an FSR-free Fano resonance realized in a silicon-on-insulator photonic molecule comprising a bus waveguide side-coupled to two bent,

$\pi $

-phase-shifted sidewall Bragg-grating (BG) cavities. Rigorous coupled-mode theory analysis reveals that the interference between the two gratings generates a single, sharp asymmetric line shape whose slope rate (SR) and extinction ratio (ER) are governed by the bus waveguide width. On the silicon-on-insulator (SOI) platform, we experimentally demonstrate a fabricated device exhibiting an extinction ratio (ER) of 37 dB, an average slope rate (SR) of 162 dB/nm, and an FSR-free response. The proposed structure is expected to find wide applications in optical filtering and sensing that demand single-resonance operation over a broad spectral window.

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具有双侧耦合相移布拉格光栅的光子分子中的无fsr范诺共振

fano谐振光子分子在超紧凑光学滤波和传感方面具有很大的前景，但它们的性能通常受到谐振器自由光谱范围（FSR）的限制。在这封信中，我们展示了在绝缘体上硅光子分子中实现的无fsr Fano共振，该光子分子包括一个总线波导侧耦合到两个弯曲的，$\pi $相移的侧壁布拉格光栅（BG）腔。严格的耦合模式理论分析表明，两个光栅之间的干涉产生了一个单一的，尖锐的不对称线形，其斜率率（SR）和消光比（ER）由母线波导宽度决定。在绝缘体上硅（SOI）平台上，我们实验展示了一个制造的器件，其消光比（ER）为37 dB，平均斜率（SR）为162 dB/nm，无fsr响应。所提出的结构有望在需要在宽光谱窗口上进行单共振操作的光学滤波和传感中找到广泛的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.