Subwavelength metallic slit arrays have been shown to exhibit extraordinary optical transmission, whereby tunnelling surface plasmonic waves constructively interfere to create large forward light propagation. The intricate balancing needed for this interference to occur allows for resonant transmission to be highly sensitive to changes in the environment. Here we demonstrate that extraordinary optical transmission resonance can be coupled to electrostatically tunable graphene plasmonic ribbons to create electrostatic modulation of mid-infrared light. Absorption in graphene plasmonic ribbons situated inside metallic slits can efficiently block the coupling channel for resonant transmission, leading to a suppression of transmission. Full-wave simulations predict a transmission modulation of 95.7% via this mechanism. Experimental measurements reveal a modulation efficiency of 28.6% in transmission at 1,397 cm−1, corresponding to a 2.67-fold improvement over transmission without a metallic slit array. This work paves the way for enhancing light modulation in graphene plasmonics by employing noble metal plasmonic structures.
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机译：亚波长金属狭缝阵列已显示出非凡的光学透射性，从而隧穿表面等离子体波相长干涉从而产生大的前向光传播。发生这种干扰所需的复杂平衡使得共振传输对环境变化高度敏感。在这里，我们证明了非凡的光传输共振可以与静电可调的石墨烯等离激元带耦合，以产生对中红外光的静电调制。位于金属狭缝内部的石墨烯等离激元带的吸收可以有效地阻塞用于共振传输的耦合通道，从而导致传输受到抑制。全波仿真预测通过这种机制的传输调制为95.7％。实验测量表明，在1,397 cm -1 的透射率下，调制效率为28.6％，相对于没有金属狭缝阵列的透射率提高了2.67倍。这项工作为通过采用贵金属等离子体结构增强石墨烯等离子体中的光调制铺平了道路。
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