BACKGROUND Optical vortices provide one of the promising solutions for enhancing the
capacity of data multiplexing to meet an unprecedented growth in big data and internet traffic …

Topological photonics is a rapidly emerging field of research in which geometrical and
topological ideas are exploited to design and control the behavior of light. Drawing …

Rapidly growing demands for fast information processing have launched a race for creating
compact and highly efficient optical devices that can reliably transmit signals without losses …

The quantum spin Hall effect lays the foundation for the topologically protected manipulation
of waves, but is restricted to one-dimensional-lower boundaries of systems and hence limits …

Polarization is an important characteristic of electromagnetic wave. Due to novel optical
properties, graphene-based anisotropic structure is widely used to control polarization state …

The valley has been exploited as a binary degree of freedom to realize valley-selective Hall
transport and circular dichroism in two-dimensional layered materials, in which valley …

Topological photonics is an emerging field that attracts enormous interest for its novel ways
to engineer the flow of light. With the help of topological protection, the surface modes of …

We demonstrate a photonic analog of twisted bilayer graphene that has ultra-flat photonic
bands and exhibits extreme slow-light behavior. Our twisted bilayer photonic device, which …

Edge states emerge in diverse areas of science, offering promising opportunities for the
development of future electronic or optoelectronic devices, sound and light propagation …

Valley pseudospin, a new degree of freedom in photonic lattices, provides an intriguing way
to manipulate photons and enhance the robustness of optical networks. Here, topological …