Tunable multipole resonances in plasmonic crystals made by four-beam holographic lithography
Tunable multipole resonances in plasmonic crystals made by four-beam holographic lithography
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DOI：
10.1063/1.4941401
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发表时间：
2016-02-01
影响因子：
4
通讯作者：
Strauf, S.
中科院分区：
文献类型：
--
作者：
Luo, Y.;Li, X.;Strauf, S.
等离子体纳米结构将光限制在亚波长尺度，从而大大增强了光与物质的相互作用。最近的兴趣集中在受控对称性破缺以产生比偶极模式更有效地存储电磁能量的高阶多极等离子体模式。在这里，我们表明，四光束全息光刻使制造大面积等离子体晶体与近场耦合等离子体以及故意打破对称性，以维持多极模式和Fano共振。与光谱宽的偶极模式相比，我们证明了一个数量级的改善Q因子（Q = 21）时，四极模式被激活。我们进一步证明了使用入射光束的偏振态的Fano共振的连续调谐。所展示的技术开辟了将多极等离子体模式的丰富物理扩展到需要低成本和高吞吐量的晶圆级应用的可能性。(C)2016 AIP Publishing LLC.
Plasmonic nanostructures confine light to sub-wavelength scales, resulting in drastically enhanced light-matter interactions. Recent interest has focused on controlled symmetry breaking to create higher-order multipole plasmonic modes that store electromagnetic energy more efficiently than dipole modes. Here we demonstrate that four-beam holographic lithography enables fabrication of large-area plasmonic crystals with near-field coupled plasmons as well as deliberately broken symmetry to sustain multipole modes and Fano-resonances. Compared with the spectrally broad dipole modes we demonstrate an order of magnitude improved Q-factors (Q = 21) when the quadrupole mode is activated. We further demonstrate continuous tuning of the Fano-resonances using the polarization state of the incident light beam. The demonstrated technique opens possibilities to extend the rich physics of multipole plasmonic modes to wafer-scale applications that demand low-cost and high-throughput. (C) 2016 AIP Publishing LLC.