2011/09/08 by Liang Feng, Zhaowei Liu, Yeshaiahu Fainman · 1 citation
Engineering · Materials Science · #Plasmonic and Surface Plasmon Research #Metamaterials and Metasurfaces Applications #Optical Coatings and Gratings
paper · pdf · doi:10.1364/ao.50.0000g1
We constructed a metallic grating on a deep-subwavelength scale and tested its plasmonic features in visible frequencies. The deep-subwavelength metallic grating effectively acts as an anisotropic homogeneous uniaxial form-birefringent metal, exhibiting different optical responses for polarizations along different optical axes. Therefore, this form-birefringent metal supports anisotropic surface plasmon polaritons that are characterized by directly imaging the generated plasmonic index ellipsoids in reciprocal space. The observed plasmonic index ellipsoids also show a rainbow effect, where different colors are dispersively distributed in reciprocal space.