Observation of miniaturized bound states in the continuum with ultra-high quality factors
Observation of miniaturized bound states in the continuum with ultra-high quality factors
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DOI：
10.1016/j.scib.2021.10.020
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发表时间：
2022-02-17
期刊：
影响因子：
18.9
通讯作者：
Peng, Chao
中科院分区：
文献类型：
--
作者：
Chen, Zihao;Yin, Xuefan;Peng, Chao
由于其在科学技术中的重要性，光捕获是光子学领域不断追求的目标。人们已经探索了许多机制，包括使用由禁止出射波的材料或结构制成的镜子，以及无镜子但基于拓扑的连续体中的束缚态。在这里，我们报告了一种复合方法，以协作方式将连续体中的横向反射镜和束缚态结合起来，以实现一类具有高品质因数和小模态体积的片上光学腔。具体而言，光在横向上被横向异质结构的光子带隙捕获，并在垂直方向上被连续体中的多个束缚态的星座限制。因此，与离域布洛赫模式的光子晶体板中发现的连续体中的大多数束缚态不同，我们在所有三个维度上实现了光捕获，并通过实验证明了电信领域中高达 Q = 1.09 x 10(6) 的品质因数和低至 V = 17.74 (lambda(0)/n)(3) 的模态体积。我们通过对多个制造设备的统计研究进一步证明了我们方法的稳健性。我们的工作提供了一种新的光捕获方法，可以在光子集成、非线性光学和量子计算中找到潜在的应用。 (C) 2021 中国科学出版社。由 Elsevier B.V. 和中国科学出版社出版。
Light trapping is a constant pursuit in photonics because of its importance in science and technology. Many mechanisms have been explored, including the use of mirrors made of materials or structures that forbid outgoing waves, and bound states in the continuum that are mirror-less but based on topology. Here we report a compound method, combining lateral mirrors and bound states in the continuum in a cooperative way, to achieve a class of on-chip optical cavities that have high quality factors and small modal volumes. Specifically, light is trapped in the transverse direction by the photonic band gap of the lateral hetero-structure and confined in the vertical direction by the constellation of multiple bound states in the continuum. As a result, unlike most bound states in the continuum found in photonic crystal slabs that are de-localized Bloch modes, we achieve light-trapping in all three dimensions and experimentally demonstrate quality factors as high as Q = 1.09 x 10(6) and modal volumes as low as V = 17.74 (lambda(0)/n)(3) in the telecommunication regime. We further prove the robustness of our method through the statistical study of multiple fabricated devices. Our work provides a new method of light trapping, which can find potential applications in photonic integration, nonlinear optics and quantum computing. (C) 2021 Science China Press. Published by Elsevier B.V. and Science China Press.