Abstract
Numerical investigation of high-order harmonic generation (HHG) is carried out in noble gases near metal nano-dimers. The effect of geometry, shape, and gap of the dimers in plasmon resonance and local electric field enhancement has been investigated numerically by using finite-difference time-domain methods. It is shown that a lack of symmetry in dimer shapes plays an important role in the HHG process, producing appreciable modifications to the energy-resolved photoelectron spectra.
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