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Controlling the Quality Factor of a Single Acoustic Nanoresonator by Tuning its Morphology
Nano Letters ( IF 10.8 ) Pub Date : 2018-07-10 00:00:00 , DOI: 10.1021/acs.nanolett.8b02096
Fabio Medeghini 1 , Aurélien Crut 1 , Marco Gandolfi 2, 3, 4 , Francesco Rossella 5 , Paolo Maioli 1 , Fabrice Vallée 1 , Francesco Banfi 2 , Natalia Del Fatti 1
Affiliation  

The mechanical vibrations of individual gold nanodisks nanopatterned on a sapphire substrate are investigated using ultrafast time-resolved optical spectroscopy. The number and characteristics of the detected acoustic modes are found to vary with nanodisk geometry. In particular, their quality factors strongly depend on nanodisk aspect ratio (i.e., diameter over height ratio), reaching a maximal value of ≈70, higher than those previously measured for substrate-supported nano-objects. The peculiarities of the detected acoustic vibrations are confirmed by finite-element simulations, and interpreted as the result of substrate-induced hybridization between the vibrational modes of a nanodisk. The present findings demonstrate novel possibilities for engineering the vibrational modes of nano-objects.

中文翻译:

通过调整形态来控制单个声学纳米谐振器的品质因数

使用超快时间分辨光谱学研究了在蓝宝石衬底上纳米图案化的单个金纳米盘的机械振动。发现检测到的声模的数量和特征随纳米盘的几何形状而变化。特别是,它们的品质因数在很大程度上取决于纳米盘的纵横比(即直径与高度之比),达到最大值≈70,比先前对基材支撑的纳米物体的测量值要高。通过有限元模拟证实了检测到的声振动的特殊性,并将其解释为纳米盘振动模式之间底物诱导的杂交的结果。目前的发现证明了工程化纳米物体振动模式的新颖可能性。
更新日期:2018-07-10
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