The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

Planar optical elements that can manipulate the multidimensional physical parameters of
light efficiently and compactly are highly sought after in modern optics and nanophotonics. In …

Controlling spin-to-orbital angular momentum (OAM) conversion plays an important role in
many optical and wireless communication applications. While independent control of …

Cholesteric liquid crystal (CLC) chiral superstructures exhibit unique features; that is,
polychromatic and spin‐determined phase modulation. Here, a concept for digitalized chiral …

Active planar optical devices that can dynamically manipulate light are highly sought after in
modern optics and nanophotonics. The geometric phase derived from the photonic spin …

Liquid-crystal-based Pancharatnam–Berry phase optical elements (PBOEs), also known as
diffractive wave plates (DWPs), geometric phase optics (GPO), or geometric phase …

Orbital angular momentum of light (OAM) is attracting increasing attention in conjunction
with the continuing development of high-speed optical communications. The unlimited …

Cylindrical vector vortex beams, a particular class of higher‐order Poincaré sphere beams,
are generalized forms of waves carrying orbital angular momentum with inhomogeneous …

Wavefront control lies in the heart of optics. Multi‐degree orthogonal manipulation of light,
especially the on‐demand tailoring of the working band and spatial phase front, is expected …

Electromagnetic waves carrying orbital angular momentum (OAM), namely OAM beams, are
important in various fields including optics, communications, and quantum information …