Control over the dispersion of the refractive index is essential to the performance of most
modern optical systems. These range from laboratory microscopes to optical fibres and even …

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 …

Non-radiative bound states in the continuum (BICs) allow construction of resonant cavities
with confined electromagnetic energy and high-quality (Q) factors. However, the sharp …

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

Symmetry-protected bound states in the continuum (SP-BICs) are one of the most intensively
studied BICs. Typically, SP-BICs must be converted into quasi-BICs (QBICs) by breaking the …

The emergence of new technological needs in 5 G/6 G networking and broadband satellite
internet access amplifies the demand for innovative wireless communication hardware …

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 control of polarization, an essential property of light, is of broad scientific and
technological interest. Polarizers are indispensable optical elements for direct polarization …

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