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Spontaneous parametric down-conversion induced by optomechanical gradient forces in nanophotonic waveguides

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2021

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Ashour, Mohamed
Caspers, Jan Niklas
Degenfeld-Schonburg, Peter

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Physical Review A. American Physical Society (APS). 2021, 103(2), 023513. ISSN 2469-9926. eISSN 2469-9934. Available under: doi: 10.1103/PhysRevA.103.023513

Zusammenfassung

Optomechanical gradient forces arise from evanescent fields of guided waves in parallel photonic waveguides. When designed to be of an attractive nature, they increase exponentially as the gap between the waveguides decreases. Moreover, the amplitude of the gradient force can be well controlled due to its linear dependence on the input laser power. Here, we propose to exploit the intrinsic nonlinear nature of the optomechanical gradient force to induce a tunable three-wave coupling between the fundamental modes of two doubly clamped nanophotonic beams. For one of the beams having half the width of the other beam, the 1:2 internal resonance between the fundamental modes supports degenerate spontaneous parametric down conversion (SPDC). We theoretically explore the main feature of the dissipative phase diagram of the underlying degenerate parametric oscillator model to show that the critical point of the SPDC occurs at parameters which are well in reach of state-of-the-art experiments.

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ISO 690ASHOUR, Mohamed, Jan Niklas CASPERS, Eva M. WEIG, Peter DEGENFELD-SCHONBURG, 2021. Spontaneous parametric down-conversion induced by optomechanical gradient forces in nanophotonic waveguides. In: Physical Review A. American Physical Society (APS). 2021, 103(2), 023513. ISSN 2469-9926. eISSN 2469-9934. Available under: doi: 10.1103/PhysRevA.103.023513
BibTex
@article{Ashour2021Spont-53407,
  year={2021},
  doi={10.1103/PhysRevA.103.023513},
  title={Spontaneous parametric down-conversion induced by optomechanical gradient forces in nanophotonic waveguides},
  number={2},
  volume={103},
  issn={2469-9926},
  journal={Physical Review A},
  author={Ashour, Mohamed and Caspers, Jan Niklas and Weig, Eva M. and Degenfeld-Schonburg, Peter},
  note={Article Number: 023513}
}
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