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Kerr-nonlinearity induced bistable-like parity-time phase transition in coupled waveguides
Optics Express
|March 17, 2021
Summary
Optical nonlinearity induces parity-time (PT) phase transitions in coupled waveguides. A bistable-like PT phase arises from inhomogeneous PT phases, enabling control over PT phase transitions.
Area of Science:
- Nonlinear optics
- Quantum optics
- Condensed matter physics
Background:
- Parity-time (PT) symmetry is a crucial concept in quantum mechanics and optics.
- Coupled waveguides with nonlinear media offer a platform for exploring PT symmetry.
- The interplay between optical nonlinearity and PT symmetry is not fully understood.
Purpose of the Study:
- To investigate the PT symmetric phase in coupled waveguides with a Kerr-type medium.
- To analyze the influence of dipole source strength on PT phase transitions.
- To explore the phenomenon of bistable-like PT phases and their underlying mechanisms.
Main Methods:
- Analysis of the emitted field from a dipole source.
- Theoretical modeling of coupled waveguides with Kerr nonlinearity.
- Investigation of PT phase transitions under varying dipole source strengths.
Main Results:
- Optical Kerr effect induces a phase transition from exact PT to broken PT phases with increasing dipole strength.
- A bistable-like PT phase phenomenon is observed, characterized by a paradox in the emitted field.
- The bistable-like PT phase is attributed to a globally inhomogeneous PT phase within the structure.
Conclusions:
- Optical nonlinearity can effectively manipulate PT phase transitions in coupled waveguide systems.
- The observed bistable-like PT phase offers potential for novel optical applications.
- This research provides insights into controlling PT symmetry through nonlinear optical effects.
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