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Interference effect of second harmonic generation in subwavelength two-dimensional materials
Optics Express
|September 23, 2025
Summary
We developed a model to understand second-harmonic generation (SHG) in 2D materials. This helps separate material properties from optical interference for better device design.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nonlinear Optics
Background:
- Two-dimensional (2D) layered van der Waals (vdW) materials exhibit unique optical properties.
- Second-harmonic generation (SHG) is a key nonlinear optical phenomenon sensitive to material properties and experimental conditions.
Purpose of the Study:
- To develop a theoretical model to decouple optical interference effects from intrinsic second-order susceptibility in 2D materials.
- To accurately predict and optimize SHG signals for enhanced device performance.
Main Methods:
- Developed a theoretical model to calculate SHG intensity considering material thickness and substrate effects.
- Validated the model using experimental SHG data for CuInP2S6 (CIPS) on SiO2/Si substrates.
Main Results:
- The theoretical model accurately reproduced experimental SHG data for CIPS with varying thicknesses.
- Demonstrated the model's ability to distinguish intrinsic material properties from interference effects.
- Showcased the model's adaptability to different substrate-material combinations.
Conclusions:
- The developed theoretical framework is crucial for accurately characterizing the intrinsic second-order susceptibility of 2D materials.
- This work provides a pathway for designing highly efficient nonlinear optical devices based on 2D materials.
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