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Nonperturbative Nonlinearities: Perhaps Less than Meets the Eye
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DOI：10.1021/acsphotonics.4c00645.png)
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Abstract
En 中文
We address challenges in characterizing changes in permittivity and refractive index beyond standard perturbative methods with special attention given to transparent conductive oxides (TCOs). We unveil a realistic limit to permittivity changes under high optical power densities. Our study covers both slow and ultrafast nonlinearities, demonstrating that all nonlinearities induce refractive index changes accurately described by a simple curve with saturation electric field (or irradiance) and maximum change of permittivity at saturation. Our model, grounded in material properties, like oscillator strength and characteristic times, offers a robust framework for understanding and predicting nonlinear optical phenomena in TCOs and other materials. We differentiate between the significance of higher-order nonlinear susceptibilities in ultrafast and slow nonlinear scenarios. We aim to provide valuable insights for researchers exploring strong light-matter interaction.
Keywords:
Nonlinear Optics
Epsilon-Near-Zero
TransparentConducting Oxides
Nonperturbative Nonlinearities
Optical Materials
Journal
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5.6K
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