One-way Valley-locked waveguide with large channel achieved by all-dielectric Photonic Crystals
Optics Express(2024)
摘要
Nonreciprocity, which denotes the asymmetric or even unidirectional
transmission of light, constitutes the cornerstone of modern photonic circuits.
In the realm of photonic devices, it has been widely utilized in isolators,
circulators and so on. Recent topology in artificial materials, an
unprecedented degree of freedom, has been proposed to solve the effect of
impurities on nonreciprocal transmission. However, in view of the bulk-edge
correspondence, the spatial width of the transmission channel with uniform
field distribution is quite narrow and needs further exploration. In this
paper, we proposed a one-way valley-locked waveguide with a large channel in an
all-dielectric photonic crystal. Quite different from the topological edge
modes, the unidirectional property of our waveguide comes from the bulk modes
with valley-lock, which can fully utilize the whole dimension of the structure
with an efficiency of 100
distributed across the entire channel, which opens a new avenue for low-loss
nonreciprocity devices.
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