Parity-time anti-symmetric parametric amplifier
Diana A. AntonosyanNonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 2601, AustraliaAlexander S. SolntsevNonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 2601, AustraliaAndrey A. SukhorukovNonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 2601, Australia
2015en
ABI
Annotatsiya
We describe the process of parametric amplification in a directional coupler of quadratically nonlinear and lossy waveguides, which belongs to a class of optical systems with spatial parity-time (PT) symmetry in the linear regime. We identify a distinct spectral PT anti-symmetry associated with optical parametric interaction, and show that pump-controlled symmetry breaking can facilitate spectrally selective mode amplification in analogy with PT lasers. We also establish a connection between the breaking of spectral and spatial mode symmetries, revealing the potential to implement unconventional regimes of spatial light switching through ultrafast control of PT breaking by pump pulses.
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