Plasmonic angular momentum on metal-dielectric nano-wedges in a sectorial indefinite metamaterial
Author(s)Jin, Dafei; Fang, Nicholas Xuanlai
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We present an analytical study in the structure-modulated plasmonic angular momentum, which is trapped in the core region of a sectorial indefinite metamaterial. This metamaterial consists of periodically arranged metal-dielectric nano-wedges along the azimuthal direction. Employing a transfer-matrix calculation and a conformal-mapping technique, our theory can deal with an arbitrary number of wedges with realistically rounded tips. We demonstrate that in the deep-subwavelength regime, strong electric fields that carry large azimuthal variations can exist only within ten-nanometer length scale around the structural center. They are naturally bounded by a characteristic radius on the order of a hundred nanometers from the center. These extreme confining properties suggest that the structure under investigation can be superior to the conventional metal-dielectric cavities in terms of nanoscale photonic manipulation.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Optical Society of America
Jin, Dafei, and Nicholas X. Fang. “Plasmonic Angular Momentum on Metal-Dielectric Nano-Wedges in a Sectorial Indefinite Metamaterial.” Optics Express 21, no. 23 (2013): 28344.