In this Review, the theory and applications of optical micro‐and nano‐resonators are
presented from the underlying concept of their natural resonances, the so‐called quasi …

The optics of correlated disordered media is a conceptually rich research topic emerging at
the interface between the physics of waves in complex media and nanophotonics. Inspired …

Since Dicke's seminal paper on coherence in spontaneous radiation by atomic ensembles,
superradiance has been extensively studied. Subradiance, on the contrary, has remained …

Superradiance has been extensively studied in the 1970s and 1980s in the regime of
superfluorescence, where a large number of atoms are initially excited. Cooperative …

We report direct, time-resolved observations of single-photon superradiance in a highly
extended, elliptical sample of cold Rb 87 atoms. The observed rapid decay rate is …

We show that induced dipole-dipole interactions allow for photon blockade in
subwavelength ensembles of two-level, ground-state neutral atoms. Our protocol relies on …

Collective coupling between dipoles can dramatically modify the optical response of a
medium. Such effects depend strongly on the geometry of the medium and the polarization …

It is interesting to observe that all optical materials with a positive refractive index have a
value of index that is of order unity. Surprisingly, though, a deep understanding of the …

Recent experiments by Rainò et al.(Nature 2018, 563, 671− 675) have documented
cooperative emission from CsPbBr3 nanocrystal superlattices, exhibiting the hallmarks of …

Dipole spin-wave states of atomic ensembles with wave vector k (ω) mismatched from the
dispersion relation of light are difficult to access by far-field excitation but may support rich …