Excitation, scattering, and steering of acoustic waves with plasmonic nanostructures

我们提议的项目旨在将纳米光子学中发展的概念转化为纳米声学，以实现对纳米声谐振器和表面声波(SAW)传播的新方法的控制。为此，我们将利用超短激光脉冲光学激发的等离子体纳米天线作为一种将电磁场能量转换为机械振荡的手段。近年来，纳米天线的概念在纳米光子学和纳米等离子体学中得到了积极的发展，用于表面电磁波的有效定向激发(SEWS)，但对于SAW的研究还很少。因此，我们将全面研究如何将最先进和及时的纳米光子现象转化为纳米声学，使声表面波在声光和传感方面有新的应用。工作方案分为三个工作包：单个等离子体纳米粒子的声学特性(WP1)；用于高效和定向发射声表面波的等离子体纳米天线(WP2)；用于生物传感的等离子体声纳米天线(WP3)。拟议研究项目的具体任务包括：设计高Q声纳米谐振器，特别是支持连续统中束缚态的纳米谐振器；发展多极方法、群论方法和格林函数形式，用于支撑声表面波的基片上的声纳米谐振器；发展声Purcell效应和实现两个声纳米谐振器之间的强耦合机制；极点和Kerker效应的理论和实验研究；利用纳米天线定向发射声表面波；研究定向激发声表面波对纳米天线的反作用力；基于单个声纳米谐振器的质量加载传感器的实现。ITMO-LMU联合团队包括高素质的理论家和实验者。他们有能力开展我们工作方案中所述的整个科学研究周期。除了该项目的科学目标外，它的成功实施将有助于在LMU和ITMO之间转让知识、开发的方法和技术，支持俄罗斯和德国的科学关系。这种合作对参与该项目的年轻科学家非常重要，因为它将有助于发展和促进他们的职业生涯，并使他们融入国际科学界。结合科学小组实施大型国际项目的经验、全面的研究计划、必要的设备和丰富的科学背景，使我们有信心所有制定的任务都将得到充分解决，结果将发表在一流的科学期刊上，它们将引起国际纳米光子学和纳米声学科学界的高度兴趣。

Our proposed project aims to translate concepts developed in nanophotonics to nanoacoustics, in order to achieve novel means of control over nanoacoustic resonators and the propagation of surface acoustic waves (SAWs). For this we will utilize plasmonic nanoantennas excited optically by ultrashort laser pulses as a means to transduce from electromagnetic field energy to mechanical oscillations. The concept of nanoantennas has been actively developed in recent years in nanophotonics and nanoplasmonics, for efficient directional excitation of surface electromagnetic waves (SEWs), but for SAWs it has been studied much less. We will therefore comprehensively investigate the translation of state-of-the-art and timely nanophotonic phenomena to nanoacoustics, enabling new applications of SAWs in acousto-optics and sensing. The work program is divided into three work packages: acoustic properties of individual plasmonic nanoparticles (WP1); plasmonic nanoantennas for efficient and directional launching of SAWs (WP2); plasmonic acoustic nanoantennas for biosensing (WP3). The specific tasks of the proposed research project include: engineering of high-Q acoustic nanoresonators, in particular nanoresonators supporting bound states in the continuum; the development of a multipole approach, group theory methods, and a Green function formalism for acoustic nanoresonators on the substrate supporting SAWs; development of the acoustic Purcell effect and implementation of the strong-coupling regime between two acoustic nanoresonators; theoretical and experimental studies of anapole and Kerker effects; directional launching of SAWs with nanoantennas; study of the recoil force acting on an nanoantenna as a result of the directional excitation of SAWs; implementation of mass loading sensors based on a single acoustic nanoresonators. The joint ITMO-LMU team includes highly qualified theoreticians and experimentalists. They are capable to carry out the full cycle of scientific research described in our work programme. Apart from the scientific goals of the project, its successful implementation will help to transfer knowledge, developed methods and technologies between LMU and ITMO, supporting Russian-German scientific relations. Such a collaboration will be very important for young scientists involved in the project as it will help to develop and promote their careers and integrate them into the international scientific community.The combination of the scientific group’s experience in the implementation of large international projects, the comprehensive research plan, necessary equipment, rich scientific background, allows us to be confident that all formulated tasks will be fully addressed, the results will be published in top-ranked scientific journals and they will be of high interest of the international scientific communities of both nanophotonics and nanoacoustics.