Abstract
We report a new class of optical parametric oscillators, based on a 20-μm-long semiconductor photonic crystal cavity and operating at telecom wavelengths. Because the confinement results from Bragg scattering, the optical cavity contains a few modes, approximately equispaced in frequency. Parametric oscillation is reached when these high-quality-factor modes are thermally tuned into a triply resonant configuration, whereas any other parametric interaction is strongly suppressed. The lowest pump power threshold is estimated to be 50–70 μW. This source behaves as an ideal degenerate optical parametric oscillator, addressing the needs in the field of quantum optical circuits and paving the way towards the dense integration of highly efficient nonlinear sources of squeezed light or entangled photons pairs.
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Acknowledgements
We thank G. Lehouc, S. Xavier and O. Parillaud for contributing to the InGaP PhC technology, I. Ghorbel for assistance with the experiments, and G. Moille, C. de Angelis, T. Debuisschert, E. Lallier, A. Brignon and A. Martin for fruitful and insightful discussions. This work is supported by a public grant overseen by the French National Agency (ANR) as part of the ‘Investissements d’Avenir’ programme (Labex NanoSaclay reference ANR-10-LABX-0035). This work has also received funding from the European Union’s Horizon 2020 Research and Innovation Programme under the European Research Council (ERC) project HYPNOTIC (grant agreement number 726420) and the Marie Skłodowska-Curie project MOCCA (grant agreement number 814147).
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S.C. and G.M. equally contributed to the measurements. F.R. and S.C. developed the technology. A.D.R. and G.M. analysed the results, A.D.R. developed the theory. All the authors contributed to writing the manuscript.
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Extended data
Extended Data Fig. 1 Triply-resonant Cavity.
a: Representation of a resonator coupled to a single- ended waveguide in the time-dependent coupled mode theory with definition of field in the waveguide s and in the cavity a, internal Γ abs and radiation loss Γ rad and waveguide coupling k; b angular frequencies ω for the normal mode and excitation waves, ‘cold’ resonances ω and detuning δ. c Linear scattering spectrum measured using OCT revealing the ω ± and ω0 modes d and corresponding calculated modes.
Extended Data Fig. 2 Thermo-Optic Tuning.
Description of the tuning measurement, with a pump pulling mode ω0 and detecting all the resonances a; calculated profile of the temperature (solid filled) and the dissipated energy (dashed) b and corresponding 2D map c; measured spectral shift as a function of the energy stored in the mode (markers) and fit; d estimated absorption rate including nonlinear absorption e.
Extended Data Fig. 3 Reflectivity Measurement and Model.
Linear spectral characterization of a resonator using OCT. a Extracted temporal trace revealing a narrow peak (refection from the end facet) and a broad dispersive peak (reflection from the cavity); b corresponding spectrum superimposed with the measurement of the reflection using a direct (non heterodyne) detection; c model representing reflection at the PhC coupler (=waveguide end facet) and from the cavity; d fitted reflection from cavity 5 and e cavity 7 from which the coupling factor K is extracted.
Extended Data Fig. 4 Measured Stimulated FWM efficiency vs. Theory.
Measurement of the stimulated FWM efficiency ηχ as a function of the pump offset △0 and probe detuning δ -; the corresponding measured FSR is in the inset a; comparison with the model (inset with colored frame); b max(ηχ) as a function of the pump offset, experiment (symbols) and theory (solid line).
Extended Data Fig. 5 Calibration of the OPO measurement.
OPO measurement on cavity a5. a on-chip power in the sidebands as a function of the effective pump power Pc,0 (note that the idler ωX is rescaled); b corresponding reflected pump power and calculated reflection when the pump is off- resonance (solid line), on chip pump power is 72 μW. Same horizontal axis.
Extended Data Fig. 6 OPO threshold.
OPO pump threshold as a function of the Q factor compared with the state of the art in microring and racetrack resonators made of different materials. Details and references are in the Supplementary Table IV.
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Supplementary Information
Supplementary Figs. 1–12, Discussion, equations, Tables I–IV and references.
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Marty, G., Combrié, S., Raineri, F. et al. Photonic crystal optical parametric oscillator. Nat. Photonics 15, 53–58 (2021). https://doi.org/10.1038/s41566-020-00737-z
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DOI: https://doi.org/10.1038/s41566-020-00737-z
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