Gigahertz Optomechanical Photon-Phonon Transduction between Nanostructure Lines
Gigahertz Optomechanical Photon-Phonon Transduction between Nanostructure Lines
复制标题
纳米结构线间的千兆赫兹光机械光子-声子转换
DOI：
10.1021/acs.nanolett.1c02070
复制
发表时间：
2021-07-19
期刊：
影响因子：
10.8
通讯作者：
Wright, Oliver B.
中科院分区：
文献类型：
--
作者：
Imade, Yuta;Gusev, Vitalyi E.;Wright, Oliver B.
高频表面声子在电信和传感中有无数的应用，但由于使用二维换能器阵列，它们的产生和检测通常限于占据微米级区域的换能器。在这里，通过瞬态反射光谱，我们实验证明光耦合纳米定位千兆赫表面声子转导的基础上，平行排列的线性金纳米棒接收器阵列，即准一维发射器-接收器的金纳米线发射器。我们调查的响应高达10 GHz的这些个人的光声和声光换能器，分别利用等离子体极化激元的纳米棒的纵向共振。我们还演示了表面声子检测效率是如何高度依赖于纳米棒的取向相对于声子波矢量，这限制了可检测模式的对称性，和纳米棒的声学共振谱。应用包括纳米传感。
High-frequency surface phonons have a myriad of applications in telecommunications and sensing, but their generation and detection have often been limited to transducers occupying micron-scale regions because of the use of two-dimensional transducer arrays. Here, by means of transient reflection spectroscopy we experimentally demonstrate optically coupled nanolocalized gigahertz surface phonon transduction based on a gold nanowire emitter arranged parallel to linear gold nanorod receiver arrays, that is, quasi-one-dimensional emitter-receivers. We investigate the response up to 10 GHz of these individual optoacoustic and acousto-optic transducers, respectively, by exploiting plasmon-polariton longitudinal resonances of the nanorods. We also demonstrate how the surface phonon detection efficiency is highly dependent on the nanorod orientation with respect to the phonon wave vector, which constrains the symmetry of the detectable modes, and on the nanorod acoustic resonance spectrum. Applications include nanosensing.