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Theory of enhanced second-harmonic generation by the quadrupole-dipole hybrid exciton.
J Phys Condens Matter
June 2008
Physics Department, The City College, CUNY, Convent Avenue at 138 Street, New York, NY 10031, USA.
We report calculated substantial enhancement of the second-harmonic generation (SHG) in cuprous oxide crystals, resonantly hybridized with an appropriate organic material (DCM2:CA:PS 'solid state solvent'). The quadrupole origin of the inorganic part of the quadrupole-dipole hybrid provides inversion symmetry breaking and the organic part contributes to the oscillator strength of the hybrid. We show that the enhancement of the SHG, compared to the bulk cuprous oxide crystal, is proportional to the ratio of the DCM2 dipole moment and the effective dipole moment of the quadrupole transitions in the cuprous oxide.
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