This paper reports the design and fabrication of large-area periodic arrays of metal nanostructures that can support dual-wavelength resonance with spatially overlapping hot spots. Gold films with protruding posts arranged in a rectangular lattice are stripped from silicon templates containing shallow hole arrays, defined by laser interference lithography. The plasmonic resonances at the band edges for the two orthogonal linear polarizations can be tuned independently by changing the corresponding lattice spacing. WSe 2 monolayers and IR-140 dye molecules demonstrate directional and linearly polarized photoluminescence when coupled with such plasmonic crystals. The anisotropic lattice can enable enhancements at both the excitation and emission wavelengths. The emission is preferentially coupled to the first diffraction orders of the plasmonic crystals, resulting in a directional beam.

中文翻译：

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等离子晶体具有独立可调的双共振

本文报道了金属纳米结构大面积周期性阵列的设计和制造，该阵列可以支持具有空间重叠热点的双波长共振。从包含浅孔阵列的硅模板上剥离具有以矩形格子排列的凸柱的金膜，该硅模板由激光干涉光刻技术定义。通过改变相应的晶格间距，可以独立地调谐两个正交线性极化的带边缘处的等离子体共振。WSe 2单层和IR-140染料分子在与此类等离激元晶体耦合时显示出方向性和线性极化的光致发光。各向异性晶格可以使激发和发射波长处的光增强。