231 citations · 470 across the 12 of their papers we have counts for
4 papers · 1 filter
Negative refraction of light in an atomic medium
L. Ruks, K. E. Ballantine, J. Ruostekoski
The quest to manipulate light propagation in ways not possible with natural media has driven the development of artificially structured metamaterials. One of the most striking effe…
Cooperative optical wavefront engineering with atomic arrays
Kyle E. Ballantine, Janne Ruostekoski
Natural materials typically interact weakly with the magnetic component of light which greatly limits their applications. This has led to the development of artificial metamaterial…
Parity-time symmetry and coherent perfect absorption in a cooperative atom response
K. E. Ballantine, J. Ruostekoski
Parity-Time () symmetry has become an important concept in the design of synthetic optical materials, with exotic functionalities such as unidirectional transport and…
Radiative toroidal dipole and anapole excitations in collectively responding arrays of atoms
Kyle E. Ballantine, Janne Ruostekoski
A toroidal dipole represents an often overlooked electromagnetic excitation distinct from the standard electric and magnetic multipole expansion. We show how a simple arrangement o…