This project will generate new fundamental knowledge on the control of surface wave motion. Surface waves are generated by natural or man-made sources such as earthquakes, explosions, traffic or construction operations. Many electronics include devices also use the principles of surface wave propagation. 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 to reflect or divert wave energy. The control mechanism is inspired by meta-surfaces, surfaces structured to manipulate surface wave propagation. A typical structure consists of elements installed on or inserted into the surface. Finding the right elements remains a challenge, for which no rational design process is currently available. The state-of-the-art approach is parametric; a range of materials and shapes are attempted until the desired control is achieved. The proposed approach is fundamentally different in that it relies instead on modifying the surface condition. The elements will be designed such that the necessary conditions on the surface are satisfied, leading to a systematic and optimized strategy for creating a metasurface. Since the imposed surface conditions are scale-independent, the knowledge gained in this research has potential implications across length scales. Examples include the design of next-generation filters and sensors, vibration barriers as well as seismic and explosive shields for vulnerable structures or even towns. Besides contributing to the progress of science, this research will contribute to advancing societal welfare and securing the national defense.
Dr. Mary Frecker
Dr. Parisa Shokouhi
Dr. Clifford Lissenden
National Science Foundation (NSF)