Near-Field Gain and Far-Field Control via a Plasmonic Time Crystal Slab

Abstract: Light matter interactions can be substantially altered in the presence of time varying media. We study the interaction between a harmonic electric dipole and a plasmonic time crystal slab. Temporal modulation of the plasma frequency enables near field gain, allowing the dipole to absorb rather than emit energy, suppressing nonradiative losses. At the parametric resonance condition, the slab radiates strongly to the far field, producing hundred per cent oscillations in the radiated power at distances up to a thousand times the epsilon near zero wavelength. These findings reveal a new mechanism for controlling light matter interaction in time varying plasmonic systems