Enhanced Nonlinear Optical Effects in Drift-Biased Nonreciprocal Graphene Plasmonics
Enhanced Nonlinear Optical Effects in Drift-Biased Nonreciprocal Graphene Plasmonics
复制标题
漂移偏置非互易石墨烯等离子体中的增强非线性光学效应
DOI：
10.1021/acsphotonics.3c00491
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发表时间：
2023
期刊：
影响因子：
7
通讯作者：
Monticone, Francesco
中科院分区：
文献类型：
--
作者：
Hassani Gangaraj, S. Ali;Jin, Boyuan;Argyropoulos, Christos;Monticone, Francesco
非线性光与物质的相互作用通常通过增加局域场及其与物质的相互作用时间来增强。实现这些目标的传统方法是基于共振或慢光效应。然而，这些方法受到各种问题的困扰，包括操作带宽窄、占用空间大和材料吸收。非互易系统提供了一种有趣的替代方法来增强局域场：通过在端接的非互易波导结构中阻断单向波的路径，宽带电磁场可以被显著地增强并局部化在端子附近。这种方法以前只在三维回转材料平台上进行研究，在那里需要外部磁铁和笨重的材料使其不太实用。相反，我们在这里使用了一种无磁机制来打破2D等离子体材料的互易性，例如石墨烯。具体地说，我们利用电压偏置的石墨烯薄片上的高速漂移电子来提升表面等离子体激元-极化子色散的前向/后向简并，产生与电流平行和反平行的不同传播特性的模式。我们发现，在适当端接的石墨烯准表面的边缘产生了可控的、不对称的和强烈的场热点。从理论上证明了这种非对称场热点为增强三阶非线性光学效应提供了一种有效的解决方案。作为一个例子，我们预测，使用漂移速度的实际值，在等离子体激元共振频率附近可以实现高达0.3%的三次谐波转换效率。
Nonlinear light–matter interactions are typically enhanced by increasing the local field and its interaction time with matter. Conventional methods to achieve these goals are based on resonances or slow-light effects. However, these methods suffer from various issues including narrow operational bandwidths, large footprints, and material absorption. An interesting alternative approach to enhance the local field is offered by nonreciprocal systems: by blocking the path of a unidirectional wave in a terminated nonreciprocal waveguiding structure, broadband electromagnetic fields can be drastically enhanced and localized near the termination. This approach was previously studied only in three-dimensional gyrotropic material platforms, where the need for external magnets and bulky materials makes it less practical. Here, instead, we employ a magnet-free mechanism to break reciprocity in 2D plasmonic materials, e.g., graphene. Specifically, we employ high-speed drifting electrons on a voltage-biased graphene sheet to lift the forward/backward degeneracy of the surface plasmon-polariton dispersion, creating modes with different propagation properties parallel and antiparallel to the current. We show that controllable, asymmetric, and intense field hot-spots are generated at the edges of a suitably terminated graphene metasurface. We then theoretically demonstrate that such asymmetric field hot-spots offer an effective solution to enhance third-order nonlinear optical effects. As an example, we predict that, using realistic values of drift velocity, high third-harmonic conversion efficiencies of up to 0.3% are achievable around the plasmon resonance frequencies.
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影响因子：
64.8
作者：
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通讯作者：
Wenyu Zhao;Sihan Zhao;Hongyuan Li;Sheng Wang;Shaoxin Wang;M. Iqbal Bakti Utama;S. Kahn;Yue Jiang;Xiao Xiao-Xiao;SeokJae Yoo;Kenji Watanabe;T. Taniguchi;A. Zettl;Feng Wang
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影响因子：
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作者：
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通讯作者：
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影响因子：
4.2
作者：
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通讯作者：
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影响因子：
3.7
作者：
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通讯作者：
Monticone, Francesco