Metasurfaces have seen dramatic progress in broad band and large area systems and recently advances are accelerating and progress toward commercial applications is being realized. A broad range of technologies leveraging subwavelength structure to manipulate effective electromagnetic properties are being realized across the spectrum. This work spans level of scientific and technical maturity. While linear properties of metasurfaces are increasingly entering the engineering space, applications of nonlinear metasurface properties are emerging. Detecting optical signals in the mid and long wave infrared, and the generation, detection and conversion of single photons for quantum information applications are significant to a range of Air Force technologies and drive the research to increase performance and functionality. We explore how both linear and nonlinear properties of metasurfaces can be engineered for a variety of applications. Through a multi-faceted strategy that pursues both materials development and structure optimization, we are exploring ways to use the engineering flexibility of structured materials to expand measurements capability. This includes providing processing functionality embedded within linear metasurfaces and the use of nonlinear multipolar interference allows both a non-reciprocal and unidirectional nonlinear generation from nanoelements as examples of static and dynamic systems. In addition to work leading to fundamental demonstrations, we consider more practical aspects of technology maturation. A focus of our work is to explore novel materials systems that combine the functionality needed for linear, nonlinear, plasmonic, and dielectric metasurfaces and dynamic optical systems. These comprise examples of where the engineering of materials response through structure to achieve desired optical properties can enable new potential technologies. This will be discussed in the context of application venues and ongoing research programs.
Seminars are open to alumni, friends of the Department, and the general public.