Certain lattice wave systems in translationally invariant settings have one or more spectral
bands that are strictly flat or independent of momentum in the tight binding approximation …

Recent discoveries of Mott insulating and unconventional superconducting states in twisted
bilayer graphene with moiré superlattices have not only reshaped the landscape of …

Metasurfaces are ushering in an era of multifunctional control over optical wavefronts
realized with ultrathin planarized devices. Recent advances have been enabling …

Excitation of the non‐radiative eigenmodes in photonics and metamaterials above their light
cone, that is, the bound states in the continuum (BICs), has drawn fundamental and …

Metasurfaces have been rapidly advancing our command over the many degrees of
freedom of light; however, so far, they have been mostly limited to manipulating light in free …

Quasi-bound states in the continuum (QBICs) are Fano resonant states with long optical
lifetimes controlled by symmetry-breaking perturbations. While conventional Fano …

The polarization singularity in momentum space has recently been discovered as a new
class of topological signatures of Bloch modes in photonic crystal slabs concerning the far …

Metasurfaces have been enabling the miniaturization and integration of complex optical
functionalities within an ultrathin platform by engineering the scattering features of localized …

Recent advancements in photonic bound states in the continuum (BICs) have opened up
exciting new possibilities for the design of optoelectronic devices with improved …

Diffractive photonic devices manipulate light via local and nonlocal optical modes. Local
devices, such as metasurfaces, can shape a wave front at multiple selected wavelengths …