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Size-dependent two-photon absorption and ultralow optical-limiting response in atomically-thin rhodonite
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DOI：10.1039/D5NR03776J.png)
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Abstract
En 中文
Atomically-thin materials continue to captivate researchers due to their extraordinary physical properties that often surpass those of their bulk forms. Among them; two-dimensional (2D) silicates hold particular promise; yet their nonlinear optical characteristics remain largely underexplored. This study provides an in-depth analysis of the size-dependent nonlinear optical response and optical limiting characteristics of 2D rhodonite nanoflakes; a non-layered silicate mineral; under femtosecond laser excitation. A pronounced enhancement in two-photon absorption is observed as the material transitions from large flakes (∼40 nm thickness) to few-layer structures (∼2.5 nm thickness); with the two-photon absorption coefficient increasing from the 103 to 104 cm GW−1 range; highlighting the influence of dimensional tuning. Few-layer rhodonite exhibits an ultralow optical limiting threshold of 0.38 mJ cm−2; outperforming many benchmark 2D materials; including graphene; TMDCs and MXenes. Density functional theory analysis indicates that the enhanced two-photon absorption in 2D rhodonite arises from the contributions of Fe orbitals originating from electronic states near the Fermi level. In addition; the increased probability of two-photon absorption can also be attributed to transitions between orbitals of similar character with strong contributions; which occur as a result of the hybridization between Si and O p orbitals. These findings position 2D rhodonite as a highly promising candidate for next-generation photonic technologies; including optical switching; 3D microfabrication; and quantum information processing.
Keywords:
two-photon absorption
optical limiting
2D rhodonite
nonlinear optics
dimensional tuning
Journal
IF:
5.1
Papers:
3.0W
Citations:
11.6W
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