High-Energy Surface and Volume Plasmons in Nanopatterned Sub-10 nm Aluminum Nanostructures
High-Energy Surface and Volume Plasmons in Nanopatterned Sub-10 nm Aluminum Nanostructures
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DOI：
10.1021/acs.nanolett.6b01012
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发表时间：
2016-07-01
期刊：
影响因子：
10.8
通讯作者：
Berggren, Karl K.
中科院分区：
文献类型：
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作者：
Hobbs, Richard G.;Manfrinato, Vitor R.;Berggren, Karl K.
在这项工作中，我们使用电子能量损失光谱映射完整的等离子体光谱的直径范围从3到120 nm的高分辨率电子束光刻制造的铝纳米盘。我们的纳米图案化方法使我们能够在跨越2-8 eV的宽光谱范围内产生局部表面等离子体共振。使用有限元方法的电磁模拟支持偶极、四极和六极表面等离子体振子模式以及中心对称呼吸模式的存在，具体取决于电子束激发的位置。此外，我们已经开发出一种方法，使用纳米光刻，是能够毫电子伏控制的能量和阿秒控制在这些nanodisks的体积等离子体激元的寿命。体积等离子体激元寿命的精确测量还可以提供探测和控制高度受限的金属纳米结构的DC电导率的机会。最后，我们显示了强烈的影响，在确定的能量和寿命的表面等离子体激元和体积等离子体激元局部在单个铝纳米盘的纳米盘边界，我们已经比较了这些观察到的类似的效果，通过缩放纳米盘直径。
In this work, we use electron energy-loss spectroscopy to map the complete plasmonic spectrum of aluminum nanodisks with diameters ranging from 3 to 120 nm fabricated by high-resolution electron-beam lithography. Our nanopatterning approach allows us to produce localized surface plasmon resonances across a wide spectral range spanning 2-8 eV. Electromagnetic simulations using the finite element method support the existence of dipolar, quadrupolar, and hexapolar surface plasmon modes as well as centrosymmetric breathing modes depending on the location of the electron beam excitation. In addition, we have developed an approach using nanolithography that is capable of meV control over the energy and attosecond control over the lifetime of volume plasmons in these nanodisks. The precise measurement of volume plasmon lifetime may also provide an opportunity to probe and control the DC electrical conductivity of highly confined metallic nanostructures. Lastly, we show the strong influence of the nanodisk boundary in determining both the energy and lifetime of surface plasmons and volume plasmons locally across individual aluminum nanodisks, and we have compared these observations to similar effects produced by scaling the nanodisk diameter.