Epsilon-near-zero plasmonic waveguides to enhance nonlinear coherent light-matter interactions
Epsilon-near-zero plasmonic waveguides to enhance nonlinear coherent light-matter interactions
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DOI：
10.1117/12.2320011
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发表时间：
2018-09
期刊：
影响因子：
--
通讯作者：
Ying Li;C. Argyropoulos
中科院分区：
文献类型：
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作者：
Ying Li;C. Argyropoulos
我们展示了一种在纳米尺度上相干控制光并通过使用ε近零（ENZ）等离子体波导实现相干完美吸收（CPA）的方法。所提出的波导在其截止频率处支持有效的ENZ响应，并沿其纳米通道沿着具有强且均匀的场增强。CPA条件在ENZ频率下完全满足，令人惊讶的是，通过亚波长等离子体结构，在具有适当振幅和相位的两个反向传播平面波的照射下产生强CPA。此外，我们研究了所提出的ENZ等离子体配置的非线性响应，因为我们增加了入射波的输入强度。我们证明，CPA现象可以成为强度和相位依赖在这种情况下，导致新的可调谐全光开关和吸收设备。
We demonstrate a way to coherently control light at the nanoscale and achieve coherent perfect absorption (CPA) by using epsilon-near-zero (ENZ) plasmonic waveguides. The presented waveguides support an effective ENZ response at their cut-off frequency, combined with strong and homogeneous field enhancement along their nanochannels. The CPA conditions are perfectly satisfied at the ENZ frequency, surprisingly by a subwavelength plasmonic structure, resulting in strong CPA under the illumination of two counter-propagating plane waves with appropriate amplitudes and phases. In addition, we investigate the nonlinear response of the proposed ENZ plasmonic configuration as we increase the input intensity of the incident waves. We demonstrate that the CPA phenomenon can become both intensity- and phasedependent in this case leading to new tunable all-optical switching and absorption devices.