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10.1038/srep43722 http://scihub22266oqcxt.onion/10.1038/srep43722 C5338019!5338019!28262739     free     free     free       Sci+Rep 2017 ; 7 (ä): ä Nephropedia Template TP {{tp|p=28262739|t=2017. Fundamental limits of ultrathin metasurfaces |pdf=|usr=}}{{28262739}} gab.com Text Fundamental limits of ultrathin metasurfaces JO: Sci Rep http://www.kidney.de/pget.php?&tw=1&pmid=28262739 #FOAvip We present a set of universal relations which relate the local transmission, reflection, and polarization conversion coefficients of a general class of non-magnetic passive ultrathin metasurfaces. We show that these relations are a result of equal forward and backward scattering by single layer ultrathin metasurfaces, and they lead to confinement of the transmission, reflection, and polarization conversion coefficients to limited regions of the complex plane. Using these relations, we investigate the effect of the presence of a substrate, and show that the maximum polarization conversion efficiency for a transmissive metasurface decreases as the refractive index contrast between the substrate and cladding layer increases. Furthermore, we demonstrate that a single layer reflective metasurface can achieve full 2? phase shift coverage without altering the polarization if it is illuminated from the higher refractive index material. We also discuss two approaches for achieving asymmetric scattering from metasurfaces, and realizing metasurfaces which overcome the performance limitations of single layer ultrathin metasurfaces. Twit Text FOAVip Fundamental limits of ultrathin metasurfaces ????Sci Rep http://www.kidney.de/pget.php?&tw=1&pmid=28262739 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=28262739 #FOAvip English Wikipedia <ref>{{Cite pmid|28262739}}</ref> Fundamental limits of ultrathin metasurfaces #MMPMID28262739 Arbabi A; Faraon A Sci Rep 2017[]; 7 (ä): ä PMID28262739show ga We present a set of universal relations which relate the local transmission, reflection, and polarization conversion coefficients of a general class of non-magnetic passive ultrathin metasurfaces. We show that these relations are a result of equal forward and backward scattering by single layer ultrathin metasurfaces, and they lead to confinement of the transmission, reflection, and polarization conversion coefficients to limited regions of the complex plane. Using these relations, we investigate the effect of the presence of a substrate, and show that the maximum polarization conversion efficiency for a transmissive metasurface decreases as the refractive index contrast between the substrate and cladding layer increases. Furthermore, we demonstrate that a single layer reflective metasurface can achieve full 2? phase shift coverage without altering the polarization if it is illuminated from the higher refractive index material. We also discuss two approaches for achieving asymmetric scattering from metasurfaces, and realizing metasurfaces which overcome the performance limitations of single layer ultrathin metasurfaces. äFundamental limits of ultrathin metasurfaces (epmc).pdf DeepDyve Pubget Overpricing