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In the past few years, many of the fascinating and previously almostunconceivable properties predicted for those novel, artificial, man-madematerials, so called metamaterials, were demonstrated to be not only a tangiblereality, but a very useful one. However, plenty of the best achievements inthat newly discovered field are far from having a direct translation to the, inmany aspects more interesting, high frequency range, without being burdened notonly by technological difficulties, but also conceptual ones. Of particularimportance within the realm of optical metamaterials having a negative index ofrefraction, often designated negative-index metamaterials (NIM), is the issueof simultaneously achieving a strong response of the system and low associatedlosses. In the present work, we demonstrate the possibility to use hybridmetal-semiconductor nanowires to obtain an isotropic optical NIM, with verystrong electric and magnetic responses, which exhibits extremely low losses(about two orders of magnitude better than present optical NIMs).

Ultra low-loss, isotropic 2D optical negative-index metamaterial based on hybrid metal-semiconductor nanowires