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Parity-time anti-symmetric parametric amplifier.

Diana A Antonosyan, Alexander S Solntsev, Andrey A Sukhorukov

|October 16, 2015

Summary

We demonstrate parametric amplification in optical systems with parity-time (PT) symmetry. Pump-controlled symmetry breaking enables spectrally selective amplification and ultrafast light switching.

Area of Science:

Nonlinear optics
Quantum optics
Photonics

Background:

Parity-time (PT) symmetry in optical systems offers unique properties for light manipulation.
Directional couplers with quadratic nonlinearity and loss are key components in nonlinear optics.
Optical parametric amplification is a fundamental process for generating new frequencies and amplifying light.

Purpose of the Study:

To investigate parametric amplification in PT-symmetric directional couplers.
To identify and analyze spectral PT anti-symmetry in optical parametric interactions.
To explore the potential for symmetry breaking to control light amplification and switching.

Main Methods:

Theoretical analysis of parametric amplification in nonlinear, lossy waveguides with PT symmetry.

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Identification of spectral PT anti-symmetry associated with optical parametric processes.

Investigation of pump-controlled symmetry breaking mechanisms.

Main Results:

Distinct spectral PT anti-symmetry was identified in the parametric amplification process.
Pump-controlled symmetry breaking enables spectrally selective mode amplification, analogous to PT lasers.
A connection between spectral and spatial mode symmetry breaking was established.

Conclusions:

PT-symmetric directional couplers can achieve spectrally selective amplification via parametric processes.
Pump-controlled symmetry breaking offers a route to ultrafast spatial light switching.
This work opens avenues for unconventional light manipulation in PT-symmetric optical systems.