Quantum mechanics

Reflection (computer programming)

Wavefront

Materials science

Electric dipole moment

Metamaterial

Computer science

Nanophotonics

Quantum optics

Classical mechanics

Magnetic dipole

Photonic metamaterial

Physics

Nanotechnology

Dipole

Optics

Angular momentum

Nanomaterials

Programming language

Diffraction

Optoelectronics

Natural materials typically interact weakly with the magnetic component of light which greatly limits their applications. This has led to the development of artificial metamaterials and metasurfaces. However, natural atoms, where only electric dipole transitions are relevant at optical frequencies, can cooperatively respond to light to form collective excitations with strong magnetic, as well as electric, interactions together with corresponding electric and magnetic mirror reflection properties. By combining the electric and magnetic collective degrees of freedom, we show that ultrathin planar arrays of atoms can be utilized as atomic lenses to focus light to subwavelength spots at the diffraction limit, to steer light at different angles allowing for optical sorting, and as converters between different angular momentum states. The method is based on coherently superposing induced electric and magnetic dipoles to engineer a quantum nanophotonic Huygens’ surface of atoms, giving full 2π phase control over the transmission, with close to zero reflection.

Cooperative optical wavefront engineering with atomic arrays