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Phonon-polariton resonances are manifestation of the strong interaction between an electromagnetic wave interacts and transverse-optical phonons in a crystalline solid. Such resonances result in great enhancements of ionic second-order nonlinearities [1]. For LiNbO3, dominant element of the ionic second-order nonlinear susceptibility tensor coefficients d33 at 7.5 THz is a factor of about 50 larger...
We show that transverse-pumping geometry can be exploited for THz generation when a second-order nonlinear medium is highly lossy at its polariton resonance. High conversion efficiencies can be achieved via such a novel configuration.
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