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Photonic meta-atoms in media with a frequency-dependent nonlinearity
Optics Letters
|December 15, 2025
Summary
The position of the zero-nonlinearity wavelength (ZNW) critically affects Raman self-frequency shifts in photonic meta-atoms. Photon-conserving simulations reveal ZNW proximity to weak pulses can cause instability, unlike conventional models.
Area of Science:
- Nonlinear optics
- Photonics
- Condensed matter physics
Background:
- Photonic meta-atoms exhibit unique light-matter interactions.
- Zero-nonlinearity wavelength (ZNW) is crucial for controlling nonlinear optical phenomena.
- Soliton-bound states are fundamental in nonlinear wave propagation.
Purpose of the Study:
- Investigate the impact of ZNW position on Raman self-frequency shifts in photonic meta-atoms.
- Analyze the stability of two-color soliton compounds based on ZNW location.
- Compare simulation results from photon-conserving and conventional nonlinear Schrödinger equations.
Main Methods:
- Theoretical study of photonic meta-atoms in media with a ZNW.
- Numerical simulations using the photon-conserving Generalized Nonlinear Schrödinger Equation (pcGNLSE).
- Comparison with results from the conventional Generalized Nonlinear Schrödinger Equation (GNLSE).
Main Results:
- Raman self-frequency shift is highly sensitive to the ZNW position.
- Trapped energy and compound stability depend on ZNW proximity to the weak pulse wavelength.
- Significant discrepancies exist between pcGNLSE and GNLSE predictions, especially regarding compound stability.
Conclusions:
- The ZNW position is a critical parameter for controlling nonlinear effects in photonic meta-atoms.
- Photon-conserving models provide more accurate predictions for soliton-bound states near the ZNW.
- Conventional GNLSE may inaccurately predict the stability of two-color compounds under specific ZNW conditions.
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