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We report calculated substantial enhancement of the second harmonicgeneration (SHG) in cuprous oxide crystals resonantly hybridized with anappropriate organic material (DCM2:CA:PS 'solid-state solvent'). The quadrupoleorigin of the inorganic part of the quadrupole-dipole hybrid provides inversionsymmetry breaking and the organic part contributes to the oscillator strengthof the hybrid. We show that the enhancement of the SHG, compared to bulkcuprous oxide crystal, is proportional to the ratio of the DCM2 dipole momentand the effective dipole moment of the quadrupole transitions in the cuprousoxide. It is also inversely proportional to the line-width of the hybrid andbulk excitons. The enhancement may be regulated by adjusting the organic blend(mutual concentration of the DCM2 and CA part of the solvent) and pumpingconditions(varying the angle of incidence in case of optical pumping orpopulating the minimum of the lower branch of the hybrid in case of electricalpumping).

Theory of enhanced second-harmonic generation by the quadrupole-dipole hybrid exciton