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NONLINEAR PHOTONICS

Low-loss nonlinear optical isolators in silicon

Asymmetric forward and backward transmission through photonic structures can be achieved via optical nonlinearities, but existing systems have typically used slow thermo-optic effects. A new resonator design has now enabled low-loss, non-reciprocal pulse routing based on the Kerr nonlinearity in integrated silicon waveguides.

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Fig. 1: Origin of optical isolation in a nonlinear Fano resonator.

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Correspondence to Eric A. Kittlaus.

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Kittlaus, E.A., Weigel, P.O. & Jones, W.M. Low-loss nonlinear optical isolators in silicon. Nat. Photonics 14, 338–339 (2020). https://doi.org/10.1038/s41566-020-0640-y

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