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Vortex ring beams in nonlinear P T-symmetric systems
Optics Letters
|April 15, 2024
Summary
We studied optical ring modes in a 2D photonic array with gain and loss. Mode stability depends on array length and non-Hermitian strength, with higher vorticity enabling stability in smaller arrays.
Area of Science:
- Photonics
- Non-Hermitian physics
- Optical metamaterials
Background:
- Photonic arrays are crucial for light manipulation.
- Non-Hermitian systems offer unique optical properties.
- Optical ring modes exhibit complex behaviors in structured media.
Purpose of the Study:
- Investigate optical ring modes in a 2D circular photonic array.
- Analyze the impact of alternating gain and loss patterns.
- Determine the stability of these modes concerning array length and non-Hermitian parameter strength.
Main Methods:
- Numerical simulations of a two-dimensional photonic array.
- Analysis of optical ring modes with varying vorticity.
- Systematic variation of array length and non-Hermitian parameter.
Main Results:
- Stability domain of ring modes decreases with increasing array length and non-Hermitian parameter.
- Higher vorticity modes exhibit enhanced stability.
- Full stability windows appear in shorter lattices for higher vorticity modes.
Conclusions:
- The interplay between array geometry, gain-loss, and mode vorticity dictates stability.
- Vorticity is a key parameter for achieving stable optical modes in non-Hermitian photonic arrays.
- Tailoring photonic array designs can control optical mode resilience.
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