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A topological nonlinear parametric amplifier.

Byoung-Uk Sohn1, Yue-Xin Huang2, Ju Won Choi1

  • 1Photonics Devices and System Group, Singapore University of Technology and Design, Singapore, 487372, Singapore.

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|November 26, 2022
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Summary
This summary is machine-generated.

We demonstrate topological nonlinear parametric amplification in a waveguide system. This utilizes localized boundary states for efficient optical amplification and wavelength conversion, with potential for tunable topological modes.

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Area of Science:

  • Topological photonics
  • Nonlinear optics
  • Condensed matter physics

Background:

  • Topological boundary states are robust eigenstates localized at interfaces between distinct topological phases.
  • These states are crucial for robust wave propagation, preserving their properties as long as the bulk topology remains intact.

Purpose of the Study:

  • To report topological nonlinear parametric amplification of light in a dimerized coupled waveguide system.
  • To demonstrate efficient optical parametric amplification and wavelength conversion using boundary states.
  • To explore nonlinear tuning mechanisms for controlling topological boundary modes.

Main Methods:

  • Utilizing a dimerized coupled waveguide system based on the Su-Schrieffer-Heeger model with a domain wall.
  • Demonstrating high-speed data transmission (30 Gb/s NRZ, 56 Gb/s PAM-4) to showcase linear transmission properties.
  • Harnessing strong light localization at the boundary for nonlinear optical processes.

Main Results:

  • Achieved efficient, low-power optical parametric amplification and wavelength conversion.
  • Demonstrated robust linear transmission properties of the topological waveguide.
  • Showcased a nonlinear tuning mechanism inducing chiral symmetry breaking and controlling topological mode transitions.

Conclusions:

  • Topological boundary states enable efficient nonlinear optical functionalities in waveguide systems.
  • Kerr nonlinearities can be used to tune topological boundary modes and induce transitions to bulk states.
  • This work presents a pathway for novel topological photonic devices with tunable properties.