Translation of nanoantenna hot spots by a metal-dielectric composite superlens

We employ numerical simulations to show that highly localized, enhanced electromagnetic fields, also known as hot spots, produced by a periodic array of silver nanoantennas can be spatially translated to the other side of a metal-dielectric composite superlens. The proposed translation of the hot spots enables surface-enhanced optical spectroscopy without the undesirable contact of molecules with metal, and thus it broadens and reinforces the potential applications of sensing based on field-enhanced fluorescence and surface-enhanced Raman scattering.