Strong Spatial and Spectral Localization of Surface Plasmons in Individual Randomly Disordered Gold Nanosponges,Nano Letters

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Strong Spatial and Spectral Localization of Surface Plasmons in Individual Randomly Disordered Gold Nanosponges
Nano Letters ( IF 9.6 ) Pub Date : 2018-07-11 00:00:00 , DOI: 10.1021/acs.nanolett.8b01785
Jinhui Zhong ₁ , Abbas Chimeh ₁ , Anke Korte ₁ , Felix Schwarz ₂ , Juemin Yi ₁ , Dong Wang ₃ , Jinxin Zhan ₁ , Peter Schaaf ₃ , Erich Runge ₂ , Christoph Lienau _{1,

4}

Affiliation

Porous nanosponges, percolated with a three-dimensional network of 10 nm sized ligaments, recently emerged as promising substrates for plasmon-enhanced spectroscopy and (photo)catalysis. Experimental and theoretical work suggests surface plasmon localization in some hot-spot modes as the physical origin of their unusual optical properties, but so far the existence of such hot-spots has not been proven. Here we use scattering-type scanning near-field nanospectroscopy on individual gold nanosponges to reveal spatially and spectrally confined modes at 10 nm scale by recording local near-field scattering spectra. High quality factors of individual hot-spots of more than 40 are demonstrated, predicting high Purcell factors up to 10⁶. The observed field localization and enhancement make such nanosponges an appealing platform for a variety of applications ranging from nonlinear optics to strong-coupling physics.

中文翻译：

表面等离子在单个随机无序的金纳米海绵中的强空间和光谱定位。

多孔纳米海绵，渗透了一个10 nm大小的韧带的三维网络，最近成为等离子体增强光谱和（光）催化的有希望的底物。实验和理论工作表明，表面等离子体激元在某些热点模式下的定位是其异常光学特性的物理起源，但到目前为止，尚未证明此类热点的存在。在这里，我们对单个金纳米海绵使用散射型扫描近场纳米光谱，通过记录局部近场散射光谱来揭示10 nm尺度的空间和光谱受限模式。展示了超过40个热点的高质量因子，预示了高达10 ^6的高赛尔因子。观察到的场定位和增强使这种纳米海绵成为一个吸引人的平台，可用于从非线性光学到强耦合物理的各种应用。

更新日期：2018-07-11

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