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Direct optical excitation of dark plasmons for hot electron generation
Faraday Discussions ( IF 3.3 ) Pub Date : 2018-11-12 , DOI: 10.1039/c8fd00149a Niclas S. Mueller 1, 2, 3, 4 , Bruno G. M. Vieira 1, 2, 3, 4, 5 , Dominik Höing 4, 6, 7, 8 , Florian Schulz 4, 6, 7, 8 , Eduardo B. Barros 4, 6, 7, 8 , Holger Lange 4, 6, 7, 8 , Stephanie Reich 1, 2, 3, 4
Faraday Discussions ( IF 3.3 ) Pub Date : 2018-11-12 , DOI: 10.1039/c8fd00149a Niclas S. Mueller 1, 2, 3, 4 , Bruno G. M. Vieira 1, 2, 3, 4, 5 , Dominik Höing 4, 6, 7, 8 , Florian Schulz 4, 6, 7, 8 , Eduardo B. Barros 4, 6, 7, 8 , Holger Lange 4, 6, 7, 8 , Stephanie Reich 1, 2, 3, 4
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An ideal plasmonic system for hot-electron generation allows the optical excitation of plasmons, limits radiation losses, exhibits strong non-radiative electron damping, and is made from scalable and cost-effective materials. Here we demonstrate the optical excitation of dark interlayer plasmons in bilayers of colloidal gold nanoparticles. This excitation is created by an antiparallel orientation of the dipole moments in the nanoparticle layers; it is expected to exhibit strongly reduced radiative damping. Despite the vanishing dipole moment, an incoming electromagnetic wave that is propagating normal to the surface will excite the dark mode due to field retardation. We observe a strong peak in the absorption spectrum of a colloidal gold bilayer (nanoparticle diameter = 46 nm); this peak is absent for a nanoparticle monolayer. The full width at half maximum of the dark mode is 230 meV for an ideal nanoparticle crystal and 320 meV for the structure produced by self-assembly out of solution. The position and width of the dark plasmon are efficiently tailored by the interparticle distance within the layer, nanoparticle size and layer number. We present time-resolved pump and probe experiments of hot-electron generation by bright and dark bilayer nanoparticle modes.
中文翻译：
暗等离子体激元的直接光激发以产生热电子
用于热电子生成的理想等离激元系统允许对等离激元进行光激发，限制辐射损耗，表现出强大的非辐射电子阻尼，并由可扩展且具有成本效益的材料制成。在这里，我们展示了胶态金纳米颗粒双层中暗层间等离子体激元的光激发。这种激发是通过纳米粒子层中偶极矩的反平行取向来产生的。预期其辐射阻尼将大大降低。尽管偶极矩消失了，但由于场延迟，垂直于表面传播的入射电磁波将激发暗模式。我们在胶体金双层（纳米粒子直径= 46 nm）的吸收光谱中观察到一个很强的峰。纳米颗粒单层不存在该峰。对于理想的纳米颗粒晶体，暗模式的半峰全宽为230 meV，对于溶液自组装产生的结构，其全宽为320 meV。暗等离子体激元的位置和宽度可通过层内的粒子间距离，纳米粒子大小和层数有效地调整。我们目前通过亮和暗双层纳米粒子模式的热电子生成的时间分辨的泵浦和探针实验。
更新日期：2019-05-29
中文翻译：
暗等离子体激元的直接光激发以产生热电子
用于热电子生成的理想等离激元系统允许对等离激元进行光激发，限制辐射损耗，表现出强大的非辐射电子阻尼，并由可扩展且具有成本效益的材料制成。在这里，我们展示了胶态金纳米颗粒双层中暗层间等离子体激元的光激发。这种激发是通过纳米粒子层中偶极矩的反平行取向来产生的。预期其辐射阻尼将大大降低。尽管偶极矩消失了，但由于场延迟，垂直于表面传播的入射电磁波将激发暗模式。我们在胶体金双层（纳米粒子直径= 46 nm）的吸收光谱中观察到一个很强的峰。纳米颗粒单层不存在该峰。对于理想的纳米颗粒晶体，暗模式的半峰全宽为230 meV，对于溶液自组装产生的结构，其全宽为320 meV。暗等离子体激元的位置和宽度可通过层内的粒子间距离，纳米粒子大小和层数有效地调整。我们目前通过亮和暗双层纳米粒子模式的热电子生成的时间分辨的泵浦和探针实验。
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