Parity-Time Anti-Symmetric Parametric Amplifier
Diana A. Antonosyan, Alexander S. Solntsev, Andrey A. Sukhorukov
TL;DR
This paper explores a novel optical parametric amplifier using PT-symmetric waveguides, demonstrating pump-controlled symmetry breaking that enables spectrally selective amplification and ultrafast spatial light switching.
Contribution
It introduces the concept of spectral PT anti-symmetry in nonlinear optical systems and links spectral and spatial symmetry breaking for advanced light control.
Findings
Spectral PT anti-symmetry identified in nonlinear waveguides.
Pump-controlled symmetry breaking enables selective mode amplification.
Potential for ultrafast spatial light switching through PT symmetry manipulation.
Abstract
We describe the process of parametric amplification in a directional coupler of quadratically nonlinear and lossy waveguides, which belong to a class of optical systems with spatial parity-time (PT) symmetry in the linear regime. We identify a distinct spectral parity-time anti-symmetry associated with optical parametric interactions, and show that pump-controlled symmetry breaking can facilitate spectrally selective mode amplification in analogy with PT lasers. We also establish a connection between 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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