arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2307.02786cond-mat.mtrl-sciphysics.optics
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电荷耦合金纳米颗粒-Ge24Se76异质结构的超快三阶非线性光学响应

Ultrafast Third-Order Nonlinear Optical Response of Charge Coupled Gold Nanoparticle-Ge24Se76 Heterostructure

Vinod Kumar, Rituraj Sharma, Abhishek Bhatt, I. Csarnovics, Petr Nemec, H. Jain, K. V. Adarsh

AI总结:

本文制备了AuNP/Ge24Se76电荷耦合异质结构,发现其超快三阶非线性吸收和折射响应增强且符号反转,并通过拉曼光谱和瞬态吸收证实电荷转移机制,为非线性光学器件开发提供新途径。

摘要:

金属与非晶半导体在激光场作用下形成的电荷耦合异质结构中,供体-受体相互作用在非线性光学领域具有许多潜在应用。本工作采用顺序热蒸发技术在石英衬底上制备了电子供体金纳米颗粒(AuNP)与受体非晶Ge24Se76异质结构。在该电荷耦合异质结构中,我们展示了超快三阶非线性吸收和折射响应,以及它们相对于原始Ge24Se76的符号反转。通过拉曼光谱验证,这些具有不同等离激元波长的异质结构中增强的光学非线性源于电荷转移。此外,超快瞬态吸收测量支持了AuNP/Ge24Se76异质结构中电荷转移的论点。这些发现为开发在非线性光学中具有深远应用前景的新型器件技术开辟了令人振奋的机遇。

英文摘要:

The donor-acceptor interaction of a charge-coupled heterostructure encompassing a metal and an amorphous semiconductor subjected to a laser field has many potential applications in the realm of nonlinear optics. In this work, we fabricate an electron donor gold nanoparticle (AuNP) and acceptor amorphous Ge24Se76 heterostructure on a quartz substrate using a sequential thermal evaporation technique. In this charge-coupled heterostructure, we demonstrate the ultrafast third-order nonlinear absorptive and refractive response and their sign reversal compared to pristine Ge24Se76. Enhanced optical nonlinearity in these heterostructures of varying plasmonic wavelengths is due to charge transfer, verified by the Raman spectroscopy. Further, the ultrafast transient absorption measurements support the thesis of charge transfer in the AuNP/Ge24Se76 heterostructure. These findings open up exciting opportunities for developing novel device technologies with far-reaching applications in nonlinear optics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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