Abstract
Synergistic control of the frequency and orbital angular momentum (OAM) of light offers new opportunities for the generation of spatio-temporal optical waveforms and optical metrology. However, their physical realizations are typically bulky and complex owing to challenges in creating, manipulating and detecting mutually coherent, high-dimensional OAM states. Here we achieve combined control over the frequency and the OAM of a comb structure on a photonic chip. Dissipative optical solitons are formed in a nonlinear ring microresonator and emitted owing to engraved angular gratings, with each comb line carrying a distinct OAM. The beam of such a vortex soliton microcomb manifests dynamically revolving, double-helical intensity profiles. The one-to-one correspondence between the OAM and frequencies features a high extinction ratio of over 18.5 dB, enabling precision spectroscopy of optical vortices. Our work provides an integrated solution for realizing coherent light sources that are multiplexed in the spatial and frequency domains, with the potential to establish a new approach to the generation of high-dimensional structured light.
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Data availability
The data that support the findings of this study are available via figshare at https://doi.org/10.6084/m9.figshare.24782970.
Code availability
The code used in this study is available via figshare at https://doi.org/10.6084/m9.figshare.24782970.
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Acknowledgements
We acknowledge Z. Zhang for helpful discussion. This work is supported by National Key R&D Plan of China (grant nos. 2021YFB2800601 and 2018YFA0704404), Beijing Natural Science Foundation (no. Z210004), and National Natural Science Foundation of China (nos. 92150108, 12293051, 62035017, 62175002, 92150301, 11825402, 62222515, 91950118, 12174438, 11834001 and 61905012).
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The project was conceived by W.L. and Q.-F.Y. Experiments were designed and performed by Y.L., C.L., W.L. and Q.-F.Y., with assistance from S.F., C.G. and J.W. Devices were designed by Y.L. and C.L., and were fabricated by C.L. with assistance from M.W., Y.C., Y.W. and B.-B.L. Analysis of results was conducted by Y.L., C.L., W.L. and Q.-F.Y. The project was supervised by Q.G., Y.-F.X., W.L. and Q.-F.Y. All authors participated in writing the paper.
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Extended data
Extended Data Fig. 1 Design of the angular gratings.
a, Illustration showing the grating design. The electric fields of the doublets are shown in the lower panel. b-c, Simulated frequency splittings and Q of TE fundamental modes as a function of grating parameters. d-e, Simulated frequency splittings and Q of TM fundamental modes as a function of grating parameters. f-g, Transmitted spectra of typical TE and TM modes. Their intrinsic Q factors are also indicated.
Extended Data Fig. 2 Purity of vortex emission.
Measured power of emitted OAM components in LHCP from each mode using modal decomposition.
Extended Data Fig. 3 Measurement of the vortex microcomb.
a, Experimental setup. EDFA: erbium-doped fiber amplifier; PC: polarization controller; FBG: fiber Bragg grating; BS: beam splitter; COL: collimator; QWP: quarter-wave plate; Pol: Polarizer; OSA: optical spectrum analyzer. The inset shows the real-space emission of the microresonator. b, Unfiltered vortex beams (i), filtered vortex beams (ii), Gaussian beams (iii), and interference patterns of the filtered vortex beams and Gaussian beams (iv). The 3 images on the right panel are the zoom-in of the white dotted box in (i). The sensitivities of the CCD are identical for all images in b.
Extended Data Fig. 4 Measurement of the beam profile.
a, Experimental setup. ND filter: neutral-density filter. b, Schematic illustration of the transformation process from vortex solitons to Gaussian solitons using a spatial filter in the real space.
Supplementary information
Supplementary Information
Numerical Simulations: ‘Simulation of mode splitting’, ‘Simulation of soliton states’ and ‘Profiles of the vortex emission’. Additional experimental results: ‘Comparison between mode-locked and mode-unlocked vortex microcombs’, ‘Two-soliton vortex microcomb’ and ‘Vortex spectroscopy’.
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Liu, Y., Lao, C., Wang, M. et al. Integrated vortex soliton microcombs. Nat. Photon. (2024). https://doi.org/10.1038/s41566-024-01418-x
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DOI: https://doi.org/10.1038/s41566-024-01418-x