Efficient mid-infrared wavelength converter based on plasmon-enhanced nonlinear response in graphene nanoribbons
Efficient mid-infrared wavelength converter based on plasmon-enhanced nonlinear response in graphene nanoribbons
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DOI：
10.1088/1361-6463/ac3e92
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Jiao Chi;Hongjun Liu;Zhaolu Wang;N. Huang
中科院分区：
文献类型：
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作者：
Jiao Chi;Hongjun Liu;Zhaolu Wang;N. Huang
具有增强局域电场的石墨烯等离子体激元已被用于增强线性光学纳米器件中的光-物质相互作用。同时，石墨烯是一种优良的三阶非线性材料。我们提出了一个等离子体增强的三阶非线性极化率的石墨烯纳米带的机制的理论研究。结果表明，石墨烯纳米带的三阶非线性极化率可以比连续石墨烯片的本征极化率大一个数量级.结合这些属性与放松的相位匹配条件，由于石墨烯的石墨烯，我们提出了一种新的等离子体增强的中红外（MIR）波长转换器与阵列的石墨烯纳米带。信号光的波长在MIR范围内，这可以激发石墨烯纳米带阵列中的可调谐表面等离子体激元。与没有石墨烯等离子体激元的石墨烯片相比，从MIR到近红外波长的转换器的效率可以显著提高60倍。这为石墨烯在非线性光学纳米器件中的有效应用提供了一种新的思路。所提出的MIR波长转换器是紧凑的，可调谐的，并具有良好的潜力，在石墨烯基MIR探测器具有高的检测效率。
Graphene plasmons with enhanced localized electric field have been used for boosting the light–matter interaction in linear optical nano-devices. Meanwhile, graphene is an excellent nonlinear material for several third-order nonlinear processes. We present a theoretical investigation of the mechanism of plasmon-enhanced third-order nonlinearity susceptibility of graphene nanoribbons. It is demonstrated that the third-order nonlinearity susceptibility of graphene nanoribbons with excited graphene surface plasmon polaritons can be an order of magnitude larger than the intrinsic susceptibility of a continuous graphene sheet. Combining these properties with the relaxed phase matching condition due to the ultrathin graphene, we propose a novel plasmon-enhanced mid-infrared (MIR) wavelength converter with arrays of graphene nanoribbons. The wavelength of signal light is in the MIR range, which can excite the tunable surface plasmons polaritons in arrays of graphene nanoribbons. The efficiency of the converter from MIR to near-infrared wavelength can be remarkably improved by 60 times compared with a graphene sheet without graphene plasmons. This work provides a novel idea for the efficient application of graphene in nonlinear optical nano-devices. The proposed MIR wavelength converter is compact, tunable and has promising potential in graphene-based MIR detectors with high detection efficiency.