All-dielectric metamaterials and metasurfaces have been demonstrated as ideal platforms to
manipulate electromagnetic waves and enhance light–matter interaction. Analogous to …

Nonradiating sources of energy have traditionally been studied in quantum mechanics and
astrophysics but have received very little attention in the photonics community. This situation …

Quantum state engineering, the cornerstone of quantum photonic technologies, mainly
relies on spontaneous parametric downconversion and four-wave mixing, where one or two …

We reveal that metasurfaces created by seemingly different lattices of (dielectric or metallic)
meta-atoms with broken in-plane symmetry can support sharp high-Q resonances arising …

Tailoring optical nonlinear effects (eg, harmonic generation, sum-frequency mixing, etc.) in
the recently emerging all-dielectric platform is important for both fundamental science and …

Resonant metasurfaces are an attractive platform for enhancing the nonlinear optical
processes, such as second harmonic generation (SHG), since they can generate large local …

Symmetry-protected bound states in the continuum (BICs) are nonradiative states with
infinite lifetime and perfect confinement of energy even though lying in the radiation …

Nonlinear nanostructured surfaces provide a paradigm shift in nonlinear optics with new
ways to control and manipulate frequency conversion processes at the nanoscale, also …

Here we present a roadmap on Photonic metasurfaces. This document consists of a number
of perspective articles on different applications, challenge areas or technologies underlying …

All-dielectric optical metasurfaces are a workhorse in nano-optics, because of both their
ability to manipulate light in different degrees of freedom and their excellent performance at …