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arXiv 2102.09843physics.optics
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量子等离激元增强石墨烯纳米片中的非线性波混合

Quantum plasmon enhanced nonlinear wave mixing in graphene nanoflakes

Hanying Deng, Changming Huang, Yingji He, Fangwei Ye

摘要:

采用距离近邻量子力学方法研究了石墨烯纳米片(GNF)中的非线性光混频,包括和频、差频以及四波混频。我们的分析表明,分子尺度的GNF支持量子等离子体激元在可见光谱区,并实现显着增强的非线性光波混频。具体地,GNF的二阶和三阶波混合极化率显著增强,前提是输入或输出频率中的一个(或多个)与量子等离子体共振一致。此外,通过将腔嵌入到六边形GNF中,我们表明可以打破结构反转对称性,并实现否则禁止的二阶波混频,这被发现也被量子等离子体共振增强。这项研究表明,分子大小的石墨烯可以用于纳米非线性光学器件和超灵敏分子传感器的量子机制。

英文摘要:

A distant-neighbor quantum-mechanical method is used to study the nonlinear optical wave mixing in graphene nanoflakes (GNFs), including sum- and difference-frequency generation, as well as four-wave mixing. Our analysis shows that molecular-scale GNFs support quantum plasmons in the visible spectrum region, and significant enhancement of nonlinear optical wave mixing is achieved. Specifically, the second- and third-order wave-mixing polarizabilities of GNFs are dramatically enhanced, provided that one (or more) of the input or output frequencies coincide with a quantum plasmon resonance. Moreover, by embedding a cavity into hexagonal GNFs, we show that one can break the structural inversion symmetry and enable otherwise forbidden second-order wave mixing, which is found to be enhanced by the quantum plasmon resonance too. This study reveals that the molecular-sized graphene could be used in the quantum regime for nanoscale nonlinear optical devices and ultrasensitive molecular sensors.

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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