Mechanical Deformation–Assisted Fabrication of Plasmonic Nanobowties with Broken Symmetry and Tunable Gaps,Particle & Particle Systems Characterization

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Mechanical Deformation–Assisted Fabrication of Plasmonic Nanobowties with Broken Symmetry and Tunable Gaps
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2019-12-18 , DOI: 10.1002/ppsc.201900463
Yue‐Feng Liu _{1,

2,

3,

4} , Runyu Zhang _{2,

3,

4} , Paul V. Braun _{2,

3,

4,

5}

Affiliation

A symmetry broken and gap tunable gold nanobowtie array is demonstrated by nanosphere lithography performed on a mechanically uniaxially prestretched elastomeric substrate. Due to symmetry breaking of each nanotriangle with its three neighboring nanotriangles once the uniaxial prestretch is released, the structure exhibits polarization‐dependent optical properties. In addition, the decrease in the gap between adjacent triangles provided by mechanical relaxation of the substrate enhances the electric field enhancement between adjacent triangles, which in turn results in enhanced Raman scattering from molecules present in the gap. Triangle apex‐to‐apex gaps as small as 20 nm are generated using a colloidal crystal formed from 500 nm colloids on at 30% prestretched substrate (gaps formed when an unstretched substrate is used are ≈115 nm).

中文翻译：

机械变形辅助的对称性和可调间隙等离子纳米弓的制造。

通过在机械单轴预拉伸的弹性体基底上进行的纳米球光刻技术，证明了对称的，可间隙可调的金纳米领结阵列。一旦释放单轴预拉伸，由于每个纳米三角形与其三个相邻的纳米三角形对称断裂，该结构表现出偏振相关的光学特性。另外，通过基板的机械松弛所提供的相邻三角形之间的间隙的减小增强了相邻三角形之间的电场增强，这继而导致间隙中存在的分子的拉曼散射增强。使用由500 nm胶体在30％的预拉伸基板上形成的胶体晶体，可产生小至20 nm的三角顶点至顶端间隙（使用未拉伸的基板时形成的间隙约为115 nm）。

更新日期：2019-12-18

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