GHz Phononic Crystal Devices

目的：这项建议旨在开发一种新型的GHz纳米级声子晶体(PC)器件，用于在纳米尺度上理解和设计低损耗声学材料的基本特性，展示隧道、波导和多路复用等声学功能，并合成最先进的微/纳米机械(M/NEMS)谐振器无法实现的小型化射频(RF)信号处理器。智能优点：这一提议的主要优点在于设计了一类变革性的声学设备，能够同时具有高Q值、直接匹配50℃和前所未有的功能，例如形状因数比目前射频组件显著降低的频率多路复用。此外，该项目将通过开发实验工具，了解接近和高于声子弛豫时间的频率上的声子-声子相互作用，从而在基础物理一级取得一些变革性的进展。更广泛的影响：PI将参与费城当地高中的教育活动，特别关注代表人数不足的少数族裔。PI的实验室和西费城学校之间的合作努力将使在PI的实验室进行研究的高中生能够了解更多关于尖端科学和技术的知识。本科生将通过研究职位和暑期REU项目参与研究活动。这个项目带来的基本发现将包括在目前国际和平研究所正在教授的研究生课程中。最后，PI计划通过在宾夕法尼亚纳米日上展示他的研究成果来让公众参与进来。

GHz PHONONIC CRYSTAL DEVICESAbstractObjective: This proposal targets the development of a new class of GHz nanoscale phononic crystal (PC) devices that will be employed to understand and engineer the fundamental properties of low loss acoustic materials at the nanoscale, demonstrate acoustic functionalities such as tunneling, waveguiding and multiplexing and synthesize miniaturized radio frequency (RF) signal processors that are not attainable with state-of-the-art micro/nano mechanical (M/NEMS) resonators. Intellectual Merit: The main merit of this proposal consists in devising a transformative class of acoustic devices simultaneously capable of high Q, direct matching to 50 Ù and unprecedented functionalities such as frequency multiplexing in a significantly reduced form factor than what is currently possible with RF components. Furthermore, the project will enable some transformative advancement at the fundamental physics level by developing experimental tools for the understanding of phonon-phonon interactions at frequencies close to and above the phonon relaxation time. Broader Impact: The PI will be involved in organizing educational activities with local high schools in Philadelphia, with special attention to underrepresented minorities. The collaborative effort between the PI's laboratory and the West Philadelphia schools will allow high school students doing research in the PI's laboratory to learn more about cutting-edge science and technology. Undergraduate students will be involved in research activities via research positions and summer REU programs. The fundamental discoveries enabled by this project will be included in the current graduate course the PI is teaching. Finally, the PI plans to involve the general public by presenting his research findings at the Penn Nanoday.