Size-dependent two-photon absorption and ultralow optical-limiting response in atomically-thin rhodonite

Key Points

• To study the size-dependent nonlinear optical behavior of atomically-thin rhodonite.
• Analyzed the two-photon absorption (2PA) characteristics of rhodonite in different sizes.
• Assessed the optical limiting (OL) response at varying thicknesses.
• Utilized nonlinear optics principles to evaluate performance.
• Demonstrated a significant increase in 2PA with size reduction.
• Showed an ultralow optical limiting threshold in thin rhodonite.
• Highlighted the role of dimensional reduction in enhancing orbital transitions.