Backscattering protection in integrated photonics is impossible with existing technologies, says study NaturePhotonics
). At the wavelengths of the modes labelled A–D, the radiation losses in both corners are not only suppressed but also evenly distributed, confirming the existence of localized modes within the topological band., Microscopy image of a photonic circuit and overlaid vertically scattered far-fields at wavelengthdirection is excited at the input grating coupler and guided to a PTI waveguide.
Obviously, our experiments do not rule out the existence of backscattering resilience in other time-reversal-invariant PTIs with different symmetries, unit-cell geometries, interfaces or disorder levels. Even if structural disorder eventually destroys the crystal symmetry behind non-trivial topologies, backscattering might still be suppressed for limited disorder
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