Abstract An all-Si photonic structure emulating the quantum-valley-Hall effect
is proposed. We show that it acts as a photonic topological insulator (PTI), and
that an interface between two such PTIs can support edge states that are free
from scattering. The conservation of the valley degree of freedom enables
efficient in- and out-coupling of light between the free space and the photonic
structur... hiện toàn bộ