声子
材料科学
等离子体子
消散
纳米颗粒
凝聚态物理
等离子纳米粒子
纳米技术
光电子学
物理
量子力学
作者
Hilario D. Boggiano,Thomas Possmayer,Luis Morguet,Nan Lin,Luca Sortino,Stefan A. Maier,Emiliano Cortés,Gustavo Grinblat,Andrea V. Bragas,Leonardo de S. Menezes
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-11-07
标识
DOI:10.1021/acsnano.4c09193
摘要
We studied the frequency and quality factor of mechanical plasmonic nanoresonators as a function of temperature, ranging from ambient to 4 K. Our investigation focused on individual gold nanorods and nanodisks of various sizes. We observed that oscillation frequencies increase linearly as temperature decreases until saturation is reached at cryogenic temperatures. This behavior is explained by the temperature dependence of the elastic modulus, with a Debye temperature compatible with reported bulk values for gold. To describe the behavior of the quality factor, we developed a model considering the nanostructures as anelastic solids, identifying a dissipation peak around 150 K due to a thermally activated process, likely of the Niblett-Wilks mechanism type. Importantly, our findings suggest that external dissipation factors are more critical to improving quality factors than internal friction, which can be increased by modifying the nanoresonator's environment. Our results enable the future design of structures with high vibration frequencies and quality factors by effectively controlling external losses.
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