Inverse-Designed Photonic Crystal Circuits for Optical Beam Steering,ACS Photonics

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Inverse-Designed Photonic Crystal Circuits for Optical Beam Steering
ACS Photonics ( IF 6.5 ) Pub Date : 2021-10-05 , DOI: 10.1021/acsphotonics.1c01119
Dries Vercruysse ₁ , Neil V. Sapra ₁ , Ki Youl Yang ₁ , Jelena Vučković ₁

Affiliation

The ability of photonic crystal waveguides (PCWs) to confine and slow down light makes them an ideal component to enhance the performance of various photonic devices, such as optical modulators or sensors. However, the integration of PCWs in photonic applications poses design challenges, most notably, engineering the PCW mode dispersion and creating efficient coupling devices. Here, we solve these challenges with photonic inverse design and experimentally demonstrate a slow-light PCW optical phased array (OPA) with a wide steering range. Even and odd mode PCWs are engineered for a group index of 25, over a bandwidth of 20 and 12 nm, respectively. Additionally, for both PCW designs, we create strip waveguide couplers and free-space vertical couplers. Finally, also relying on inverse design, the radiative losses of the PCW are engineered, allowing us to construct OPAs with a 20° steering range in a 20 nm bandwidth.

中文翻译：

用于光束控制的逆向设计光子晶体电路

光子晶体波导 (PCW) 限制和减慢光的能力使其成为增强各种光子器件（例如光调制器或传感器）性能的理想组件。然而，在光子应用中集成 PCW 带来了设计挑战，最显着的是，设计 PCW 模式色散和创建高效的耦合设备。在这里，我们通过光子逆向设计解决了这些挑战，并通过实验证明了一种具有广泛转向范围的慢光 PCW 光学相控阵 (OPA)。偶数和奇数模式 PCW 设计为组指数为 25，带宽分别为 20 和 12 nm。此外，对于这两种 PCW 设计，我们创建了条形波导耦合器和自由空间垂直耦合器。最后，同样依靠逆向设计，设计了 PCW 的辐射损耗，

更新日期：2021-10-20

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