Kerr frequency combs Gires-Tournois-based 3D photonic source

KOGIT项目旨在利用成熟的高晶体质量和性能的基于algaas的垂直技术，设计、制造、实验分析和理论研究一种用于光学频率梳（OFC）生成的新型三维（3D）源。我们的方法包括设计一个集成在紧凑的自由空间外腔中的光注入垂直发射克尔吉斯-图诺斯干涉仪（KGTI）。这种耦合腔系统将被设计成达到光学双稳定状态；该联盟成员最近的一项理论研究表明，存在鲁棒可调谐的OFCs，在传感和计量等应用方面具有很高的潜力。通过实现平凹或自成像空腔结构，可以从较小的菲涅耳数过渡到较大的菲涅耳数，其中KGTI横向平面上的所有点都是强相关的，其中每个点都可以独立地产生自己的OFC。在后一种情况下，我们设想通过在KGTI中集成二维超表面来控制横向多路复用光束特性，从而产生多个、可重构和空间独立的OFCs的可能性。

The project KOGIT aims at designing, fabricating, analyzing experimentally and studying theoretically a novel three-dimensional (3D) source for optical frequency combs (OFC) generation using a mature AlGaAs-based vertical technology of high crystal quality and performance. Our approach consists in designing an optically-injected vertical-emission Kerr Gires-Tournois Interferometer (KGTI) integrated in a compact free-space external cavity. This coupled-cavity system will be designed to reach the regime of optical bistability; a recent theoretical study by the members of the consortium has showed the existence of robust and tunable OFCs with high potential for applications such as sensing and metrology. By realizing plano-concave or self-imaging cavity configurations, one can pass from a small Fresnel number, where all the points in the transverse plane of the KGTI are strongly correlated, to a large Fresnel number where each point can generate independently its own OFC. In that latter case, we envision the possibility to generate multiple, reconfigurable and spatially independent OFCs via the integration of 2D metasurfaces in the KGTI to control the transverse multiplexed light beam properties.