Meta-Surface Design Optimization for Controlling the Surface Waves Propagation

该项目将通过产生关于控制面波运动的新的基础知识，促进科学进步，促进国家安全和福利。表面波(如振动)是由地震、爆炸、交通和建筑作业等自然和人为来源产生的。许多电子设备也使用表面波在设备内部传播的原理。从微型电子设备的设计到关键结构的地震或隔振，控制表面波运动的能力具有广泛的意义。该奖项支持有目的地通过改变表面条件来反射或转移波能来控制表面波传播所需的基础研究。该项目将为参与的研究生提供多学科培训和职业准备。研究小组将通过与科学与学校中心(CSATS)的合作，将研究方法和成果纳入研究生和本科课程，以及宾夕法尼亚州和全国各地K-12学校的中学教学。该项目提出了一种基于边界条件对面波传播影响的基础研究的控制面波运动的新方法。这使得能够对超表面实施合理的设计理念来控制瑞利表面波。将实施基于边界条件(BC)的策略，以创建谐振亚表面，以最小化在规定频带内向特定位置传输的能量。将开发一个优化程序，以找到满足所需BCS的最佳谐振器拓扑结构，并确定谐振器间距。将测试一种拓宽频率阻带的方法。这种方法从根本上不同于常用的频率调谐和参数设计过程。由于BCS是独立于频率的，新的方法可以在不同的长度范围内传输。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This project will promote the progress of science and advance the national security and welfare, by generating new fundamental knowledge on the control of surface wave motion. Surface waves (e.g., vibration) are generated by natural and human-made sources, such as earthquakes, explosions, traffic and construction operations. Many electronics also use the principles of surface wave propagation inside the devices. The ability to control surface wave motion has broad implications across length scales: from design of miniature electronic devices to earthquake or vibration isolation of critical structures. This award supports fundamental research needed to purposefully control the propagation of surface waves by modifying the surface conditions to reflect or divert wave energy. This project will provide multi-disciplinary training and career preparation for participating graduate students. The research team will incorporate the methods and findings of the research into graduate and undergraduate courses, as well as secondary level teaching at K-12 schools in Pennsylvania and across the country through a collaboration with the Center for Science and the Schools (CSATS).The project presents a novel approach for controlling surface wave motion based on a fundamental study of the boundary conditions' influence on the surface wave propagation. This enables implementation of a rational design philosophy for meta-surfaces to control Rayleigh surface waves. The boundary-condition (BC) based strategy will be implemented in order to create a resonant meta-surface to minimize the transmitted energy in a prescribed frequency bandwidth to a particular location. An optimization procedure will be developed to find the optimal resonator topology such that the desired BCs are satisfied and to determine the resonator spacing. A method to broaden the frequency stopband will be tested. This approach is fundamentally different from the commonly used frequency tuning and parametric design process. Since the BCs are frequency-independent, the new approach is transportable across length scales.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.