近日，中山大学的刘进及其研究团队与丹麦技术大学的Minhao Pu等人合作并取得一项新进展。经过不懈努力，他们实现集成的光学涡旋微梳。相关研究成果已于2024年3月29日在国际知名学术期刊《自然—光子学》上发表。
本文通过在III-V型集成非线性环形微谐振器上展示光学涡旋梳，将光学涡旋梳与微梳相结合。角度光栅修饰的非线性微环同时发射由50个OAM模式组成的时空光弹簧，每个微梳的频率都带有不同的OAM值。研究人员还通过实验产生了具有时变OAM的光脉冲，通过仔细地赋予时空光弹簧特定的多模态相位关系。他们期望这一研究成果有利于综合非线性和量子光子学的发展，以探索基本光学物理和推进光子量子技术。
据悉，对无限维光的物理自由度的探索，如轨道角动量(OAM)和频率，深刻地重塑了现代光学的格局，具有代表性的光子功能器件包括光涡旋发射器和频率梳。在纳米光子学中，低语通道模式微谐振器自然支持基于光的OAM的应用，并已被用作单色光学漩涡的片上发射器。另一方面， 回音廊通道模式微谐振器可以作为一个高效的非线性光学平台，产生不同频率的光，即微梳。
附：英文原文
Title: Integrated optical vortex microcomb
Author: Chen, Bo, Zhou, Yueguang, Liu, Yang, Ye, Chaochao, Cao, Qian, Huang, Peinian, Kim, Chanju, Zheng, Yi, Oxenlwe, Leif Katsuo, Yvind, Kresten, Li, Jin, Li, Jiaqi, Zhang, Yanfeng, Dong, Chunhua, Fu, Songnian, Zhan, Qiwen, Wang, Xuehua, Pu, Minhao, Liu, Jin
Issue&Volume: 2024-03-29
Abstract: The exploration of physical degrees of freedom of light with infinite dimensionality, such as orbital angular momentum (OAM) and frequency, has profoundly reshaped the landscape of modern optics, with representative photonic functional devices including optical vortex emitters and frequency combs. In nanophotonics, whispering gallery mode microresonators naturally support applications based on the OAM of light and have been employed as on-chip emitters of monochromatic optical vortices. On the other hand, whispering gallery mode microresonators can serve as a highly efficient non-linear optical platform for producing light at different frequencies, that is, microcombs. Here we combine optical vortices and microcombs by demonstrating an optical vortex comb on a III–V integrated non-linear ring microresonator. The angular grating-dressed non-linear microring simultaneously emits spatiotemporal light springs consisting of 50 OAM modes, with each frequency of the microcomb carrying a distinct OAM value. We also experimentally generate optical pulses with time-varying OAM by carefully endowing the spatiotemporal light springs with a specific intermodal phase relation. We expect our work to favour the development of integrated non-linear and quantum photonics for exploring fundamental optical physics and advancing photonic quantum technology.
DOI: 10.1038/s41566-024-01415-0
Source: https://www.nature.com/articles/s41566-024-01415-0