Strong Substrate Binding Modulates the Acoustic Quality Factors in Gold Nanodisks
Strong Substrate Binding Modulates the Acoustic Quality Factors in Gold Nanodisks
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DOI：
10.1021/acs.jpcc.2c09099
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Niklas Gross;M. Madadi;Behnaz Ostovar;Pratiksha D. Dongare;L. McCarthy;Wei-Yi Chiang;Wei-Shun Chang;N. Halas;C. Landes;J. Sader;S. Link
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文献类型：
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作者：
Niklas Gross;M. Madadi;Behnaz Ostovar;Pratiksha D. Dongare;L. McCarthy;Wei-Yi Chiang;Wei-Shun Chang;N. Halas;C. Landes;J. Sader;S. Link
光刻制备的等离子体纳米粒子是理想的机械探针，因为它们的振动行为可以通过颗粒尺寸和形状精确调节。但是这些粒子表现出很强的内在和外在阻尼，导致小的振动质量（Q）因子。在这里，我们进行单粒子瞬态透射显微镜，以探讨基板粒子的结合强度上的vibrationalQ-因子的光刻制备的金纳米盘在玻璃上的效果。弱结合和强结合通过不同厚度的钛粘合层实现。我们发现，强结合导致产生几个新的声学模式与variingQ-因子，取决于颗粒的纵横比和基板材料。我们的工作提出了一种方法来调整光刻制备的纳米粒子的增强acousticQ因子，并提供了一个全面的描述其阻尼机制。
Lithographically prepared plasmonic nanoparticles are ideal mechanical probes, as their vibrational behavior can be precisely tuned through particle size and shape. But these particles exhibit strong intrinsic and extrinsic damping that results in small vibrational quality (Q) factors. Here, we perform single-particle transient transmission microscopy to investigate the effect of substrate-particle binding strength on the vibrationalQ-factor of lithographically prepared gold nanodisks on glass. Weak and strong binding is realized through titanium adhesion layers of variable thickness. We find that strong binding leads to the generation of several new acoustic modes with varyingQ-factors that depend on the particle aspect ratio and substrate material. Our work proposes an approach to tune enhanced acousticQ-factors of lithographically prepared nanoparticles and offers a comprehensive description of their damping mechanism.