Breaking reciprocity at the nanoscale can produce directional formation of images due to the asymmetric nonlinear optical response of subwavelength anisotropic resonators. The self-induced passive non-reciprocity has advantages compared to magnet or time modulation approaches and may impact both classical and quantum photonics.
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Argyropoulos, C. Asymmetric control of light at the nanoscale. Nat. Photon. 16, 556–557 (2022). https://doi.org/10.1038/s41566-022-01045-4
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DOI: https://doi.org/10.1038/s41566-022-01045-4
