Shen, Bing Polson, Randy Menon, Rajesh Media 3: Integrated digital metamaterials enables ultra-compact optical diodes Originally published in Optics Express on 20 April 2015 (oe-23-8-10847) media;oe;diode;Integrated;Optics Express;20 April 2015;ultra-compact;metamaterial 2015-04-20
    https://opticapublishing.figshare.com/articles/media/Media_3_Integrated_digital_metamaterials_enables_ultra-compact_optical_diodes/4949558
10.1364/OE.23.010847.m003