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. 2015 Oct 30;6:8766. doi: 10.1038/ncomms9766

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The core material is a dielectric with a nonlinear permittivity response , while the shell is a plasmonic material with permittivity . The inner and outer radii are R₁ and R₂, respectively.

Inline graphic — The core material is a dielectric with a nonlinear permittivity response , while the shell is a plasmonic material with permittivity . The inner and outer radii are R₁ and R₂, respectively.