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Asymmetric electromagnetic transmission has been recently demonstrated using Lorentz-reciprocal devices which exploit a variety of patterned structures of linear materials to break spatial inversion symmetry. However, nanofabrication challenges have so far precluded the fabrication of passive transmission structures with highly asymmetric responses at visible frequencies. Here we show that high-contrast asymmetric transmission of visible light can be provided by a planar device ofdoi:10.1038/ncomms5141 pmid:24936801 fatcat:yldnrblcbfcdpfaifag2ryhphy