Integrated-optic cavity resonators, such as Fabry–Perot microcavities and microrings, are key building blocks of photonics integrated circuits and are used extensively in applications such as optical communications and microwave photonics. For a single, conventional, optical-cavity resonator, resonance peaks appear periodically in frequency and have Lorentzian shapes in nature, which generally cannot be broken. Here, we report on fully tailorable, integrated-optic resonators that allow for independent control of individual resonance or spectral peaks as regards their presence, linewidths and extinction ratios, resonant wavelengths, and shapes and bandwidths. The response shapes can be set to be Lorentzian, Gaussian-like, or square. The resonators are based on chirped waveguide Moiré gratings developed on a silicon-on-insulator platform. We also demonstrate that they can be implemented on compact Archimedean spiral shapes to have sizes comparable to microring and microdisk resonators, with no spectral degradation. The unprecedented spectral flexibility of these resonators makes them attractive for a variety of fields and will enable new avenues for exploration in relevant areas such as optical waveform synthesis and microwave photonics.

中文翻译：

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基于chi波导莫尔光栅的完全可定制的集成光谐振器

集成光腔谐振器，例如Fabry-Perot微腔和微环，是光子集成电路的关键组成部分，并广泛用于光通信和微波光子学等应用中。对于单个传统的光腔谐振器，谐振峰的频率会周期性出现，并且本质上具有洛伦兹形状，通常无法破坏。在这里，我们报道了完全可定制的集成光学谐振器，这些谐振器允许对单个谐振或频谱峰的存在，线宽和消光比，谐振波长以及形状和带宽进行独立控制。响应形状可以设置为洛伦兹，高斯型或正方形。谐振器基于在绝缘体上硅平台上开发的chi波导莫尔光栅。我们还证明了它们可以在紧凑的Archimedean螺旋形状上实现，使其具有可与微环和微盘谐振器相媲美的尺寸，并且不会降低光谱。这些谐振器具有前所未有的频谱灵活性，使其在各种领域都具有吸引力，并将为在相关领域探索新的途径，例如光波形合成和微波光子学。