Omnidirectional anomalous mirror for out-of-plane beam steering
Abstract
Abstract This program seeks to demonstrate engineered metamaterial (EnMat)-based anomalous mirrors that is capable of efficient anomalous out-of-plane beam steering for arbitrary angle and plane of incidence. Presently, metasurfaces realizing anomalous reflection has relied on shape-based resonators whose light scattering phase are predominantly imparted at the resonance frequency and along the plane of incidence. Realization of a finite phase gradient along the direction which lies outside the plane of incidence is possible in these metasurfaces, albeit only within a small light acceptance cone. Moreover, the efficiency of out-of-plane steering is extremely low. The goal of this program is to design and experimentally demonstrate EnMat-based anomalous mirror that exhibits an anomalous phase that is relatively independent of the angle and plane of incidence, and across a band of frequency in the near-infrared (NIR), and is capable of efficient out-of-plane beam steering. We plan to achieve this novel function with cylindrically symmetric nanophotonic resonators. The aim of the proposed seed program is to conduct proof-of-principle demonstration of this concept. This program will involve the design of EnMats and the device will be realized with a unique high-throughput nanomanufacturing method based on atomic layer lithography. Optical scatterometry measurement capabilities are employed for the experimental verification of the proposed anomalous reflection angle. All work will be perfoemed at the U. of Minnesota. Lessons learned from these proof-of-principle experiments will guide more complex metasurfaces in the future. The key milestone for this seedling will be the demonstration of an anomalous phase that is relatively independently of the angle and plane of incidence, with efficient out-of-plane steering, and across a band of frequency in the infrared. The physical and design principles, fabrication technologies, developed in this program will prove invaluable for future developments of similar technologies.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 27, 2017
- Source ID
- HR00111710006
Entities
People
- Tony Low
Organizations
- Defense Advanced Research Projects Agency
- Regents of the University of Minnesota