Three-dimensional phononic nanocrystal composed of ordered quantum dots
Three-dimensional phononic nanocrystal composed of ordered quantum dots
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DOI：
10.1063/1.3371683
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发表时间：
2010-03
影响因子：
4
通讯作者：
Y. Wen;Jia-Hong Sun;C. Dais;D. Grützmacher;Tsung-Tsong Wu;Jin-Wei Shi;Chi‐Kuang Sun
中科院分区：
文献类型：
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作者：
Y. Wen;Jia-Hong Sun;C. Dais;D. Grützmacher;Tsung-Tsong Wu;Jin-Wei Shi;Chi‐Kuang Sun
我们展示了一种由三维有序量子点（QD）组成的具有功能声学特性的纳米人工声子晶体。利用飞秒超声技术研究了这种声子晶体的晶格动力学。测量结果表明，量子点的三维有序性和均匀性是影响禁带声共振的重要因素。对于排列良好的量子点，可以发现声子带隙和相关声子腔模的显著特征，而这种量子点也可以作为低频声学声子的有效声学介质或声学Meta材料。
We demonstrated a nanoscaled artificial phononic crystal composed of three-dimensionally ordered quantum dots (QDs) with functional acoustic properties. Femtosecond ultrasonic technique is used to investigate the lattice dynamics of this phononic nanocrystal. The measurement results indicate that three-dimensional ordering and uniformity of the QDs are important factors influencing the observed acoustic resonance at the forbidden bands. For well-arranged QDs, noticeable features of the phononic band gap and the associated phonon cavity mode can be found, while this nanocrystal also serves as an effective acoustic medium, or acoustic meta material, for low-frequency acoustic phonons.