Deep-Subwavelength Plasmonic Nanoresonators Exploiting Extreme Coupling
Deep-Subwavelength Plasmonic Nanoresonators Exploiting Extreme Coupling
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DOI：
10.1021/nl4007694
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发表时间：
2013-08-01
期刊：
影响因子：
10.8
通讯作者：
Lederer, Falk
中科院分区：
文献类型：
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作者：
Alaee, Rasoul;Menzel, Christoph;Lederer, Falk
金属-绝缘体-金属（MIM）波导是在许多功能等离子体激元器件中使用的规范结构。最近，由有限的，也就是说，截断的，MINI波导制成的纳米谐振器的研究吸引了相当大的兴趣，其动机是对许多应用的承诺。然而，大多数建议的纳米谐振器没有达到深亚波长域。利用普通的制造技术，电介质间隔物通常保持相当厚，即，在几十纳米的量级。这防止了引导表面等离子体激元的波矢量强烈地偏离光线。在这里，我们将表明，开发一个极端的耦合制度，这似乎只有几个纳米厚的电介质间隔，可以解除这一限制。通过利用原子层沉积，我们制造和表征典型的深亚波长完美吸收体。我们的结果完全支持数值模拟和分析考虑。我们的工作为纳米科学的许多领域提供了动力，并将促进高影响力领域的各种应用，如超材料，光收集和传感或量子等离子体器件的制造。
A metal-insulator-metal (MIM) waveguide is a canonical structure used in many functional plasmonic devices. Recently, research on nanoresonantors made from finite, that is, truncated, MINI waveguides attracted a considerable deal of interest motivated by the promise for many applications. However, most suggested nanoresonators do not reach a deep-subwavelength domain. With ordinary fabrication techniques the dielectric spacers usually remain fairly thick, that is, in the order of tens of nanometers. This prevents the wavevector of the guided surface plasmon polariton to strongly deviate from the light line. Here, we will show that the exploitation of an extreme coupling regime, which appears for only a few nanometers thick dielectric spacer, can lift this limitation. By taking advantage of atomic layer deposition we fabricated and characterized exemplarily deep-subwavelength perfect absorbers. Our results are fully supported by numerical simulations and analytical considerations. Our work provides impetus on many fields of nanoscience and will foster various applications in high-impact areas such as metamaterials, light harvesting, and sensing or the fabrication of quantum-plasmonic devices.