Directive steerable emission from an opened chaotic cavity controlled through a reconfigurable metasurface

Chaotic reverberating cavities have been demonstrated to have a large number of exploitable degrees of freedom[1] that can be controlled with a reconfigurable metasurface [2]. Following previous work on the emission of opened electromagnetic cavity in the GHz regime[3], we demonstrate here that a reconfigurable metasurface in a small volume cavity, 4*6*0.5 λ^3, allows us to control the emission through a large opening (3.5*5.5λ^2). Measuring the transmission between a single source inside the cavity and an outside antenna, we show that a simple partitioning algorithm allows us to reach very high directivity, as well as a steering capacity over 120°. We compare those results with known limitations on the performances of antenna [4] and conclude on the performances of our device.

[1] Dupré, M. et al (2016) Physical Review B, 93(18), 180201.
[2] Kaina, N., et al (2014) Scientific reports, 4, 6693.
[3] Dupré, M. et al (2014) Physical review letters, 112(4), 043902.
[4] Harrington, R. F. (1960) J. Res. Nat. Bur. Stand, 64(1), 1-12.