Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum,Laser & Photonics Reviews

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Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-04-27 , DOI: 10.1002/lpor.201900430
Hongnan Xu ₁ , Yaocheng Shi ₁

Affiliation

The photonic bound state in the continuum (BIC) is a spatially bounded eigen state that can be realized in the form of a supercavity mode with an ultrahigh quality factor. The high‐quality supercavity resonance can be supported by photonic crystal slabs, asymmetric metasurfaces, and high‐contrast gratings. However, these schemes all suffer from bulky device size and complex experimental setup. Herein, a silicon‐waveguide‐integrated high‐quality metagrating is proposed and demonstrated as a new platform to manipulate the supercavity mode. The shallow‐ridge metagrating is directly embedded in the silicon slab waveguide, so the input slab mode can be coupled into the resonant ridge mode, which can be further transformed into the supercavity mode by utilizing the intra‐waveguide Fabry–Perot interference. Such an effect has been experimentally verified by the fabricated devices. The metagrating operating near the supercavity regime is also experimentally realized with a high quality factor ≈5200. As an application, such high‐quality metagrating is exploited to realize the temperature sensing with a high temperature sensitivity ≈77 pm K⁻¹. The proposed integrated metagrating provides a novel approach to harness the BIC, paving ways for a new class of BIC‐based nanophotonic devices with high performance, chip‐scale footprint, and long‐term stability.

中文翻译：

连续波中集成了硅波导的高质量转移支持绑定状态

连续体中的光子束缚态（BIC）是空间有界的本征态，可以以具有超高品质因数的超腔模式实现。光子晶体平板，不对称超颖表面和高对比度光栅可以支持高质量的超腔共振。但是，这些方案都具有庞大的设备尺寸和复杂的实验设置。在此，提出并集成了集成了硅波导的高质量元迁移，并将其作为操纵超腔模式的新平台进行了演示。浅脊形迁移是直接嵌入到硅平板波导中的，因此输入平板模式可以耦合到共振脊模式，可以通过利用波导内法布里-珀罗干涉将其进一步转换为超腔模式。这样的效果已经通过所制造的装置进行了实验验证。通过实验也可以实现≈5200的高品质因数，从而在超空域范围内进行迁移。作为一种应用，利用这种高质量的汇聚功能，以≈77pm K的高温灵敏度实现了温度感应。^-1。拟议的集成迁移提供了一种利用BIC的新颖方法，为具有高性能，芯片规模占位和长期稳定性的新型基于BIC的纳米光子器件铺平了道路。

更新日期：2020-04-27

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