Let there be light–to change the world we want to be! Over the past several decades, and
ever since the birth of the first laser, mankind has witnessed the development of the science …

Over the past decade, topology has emerged as a major branch in broad areas of physics,
from atomic lattices to condensed matter. In particular, topology has received significant …

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 …

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 …

Topological photonics emerged as a novel route to engineer the flow of light. Topologically
protected photonic edge modes, which are supported at the perimeters of topologically …

On-chip nanophotonic devices are a class of devices capable of controlling light on a chip to
realize performance advantages over ordinary building blocks of integrated photonics …

We study nonlinear effects in two-dimensional photonic metasurfaces supporting
topologically protected helical edge states at the nanoscale. We observe strong third …

Directional amplification, in which signals are selectively amplified depending on their
propagation direction, has attracted much attention as key resource for applications …

Topological nanophotonics is a new avenue for exploring nanoscale systems from visible to
THz frequencies, with unprecedented control. By embracing their complexity and fully …

Topological photonics provides a novel route for designing and realizing optical devices
with unprecedented functionalities. Topological edge states, which are supported at the …