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首页> 外文期刊>Advanced Functional Materials >Tailoring the Plasmonic Modes of a Grating-Nanocube Assembly to Achieve Broadband Absorption in the Visible Spectrum
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Tailoring the Plasmonic Modes of a Grating-Nanocube Assembly to Achieve Broadband Absorption in the Visible Spectrum

机译：量身定制光栅-纳米立方体组件的等离子模式，以实现可见光谱中的宽带吸收

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摘要

Engineered metal-dielectric-metal nanostructures with broadband absorbing properties in the visible spectral range are fabricated by combining the plasmonic resonances of different noble metal nanostructures. Silver nanocubes and gold nanogratings couple to each other using a dielectric polymer spacer with controllable thickness, resulting in a large multiplicative enhancement of absorption properties across a broad spectral range. Narrow, long nano-grooves in a gold film are first fabricated using electron beam lithography, after which a polymer spacer layer with a controllable thickness ranging from 4 to 12 nm is assembled by spin-assisted layer-by-layer assembly. Finally, silver nanocubes with different surface coverages ranging from 12% to 22% are deposited using the Langmuir-Blodgett technique. The individual plasmon resonances of these different nanostructures are located at significantly different optical frequencies and are tuned in this study to allow a significant increase of light absorbance of the original gratings to an average value of 84% across the broad wavelength range of 450-850 nm.
机译：通过组合不同贵金属纳米结构的等离子体共振，制造了在可见光谱范围内具有宽带吸收特性的工程化金属-介电金属纳米结构。银纳米立方体和金纳米光栅使用具有可控制厚度的介电聚合物垫片彼此耦合，从而在宽光谱范围内大大提高了吸收性能。首先使用电子束光刻技术在金膜中制造出窄而长的纳米沟槽，然后通过旋转辅助的逐层组装方法将厚度可控制在4至12 nm范围内的聚合物间隔层组装在一起。最后，使用Langmuir-Blodgett技术沉积具有12％至22％不同表面覆盖率的银纳米立方体。这些不同纳米结构的各个等离子体激元共振位于明显不同的光学频率上，并且在本研究中进行了调整，以使原始光栅的吸光度在450-850 nm的宽波长范围内显着增加至平均值的84％ 。

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  • 来源
    《Advanced Functional Materials》 |2014年第43期|6797-6805|共9页
  • 作者

    Jeffrey Geldmeier; Tobias Koenig; Mahmoud A. Mahmoud; Mostafa A. El-Sayed; Vladimir V. Tsukruk;

  • 作者单位

    School of Materials Science and Engineering Georgia Institute of Technology Atlanta, GA 30332, USA;

    School of Materials Science and Engineering Georgia Institute of Technology Atlanta, GA 30332, USA;

    School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta, GA 30332, USA;

    School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta, GA 30332, USA;

    School of Materials Science and Engineering Georgia Institute of Technology Atlanta, GA 30332, USA;

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