Second‐ and third‐harmonic generations in ultrathin phthalocyanine films prepared by the molecular‐beam epitaxy technique

Second‐ and third‐harmonic generations in ultrathin (200‐A)films of fluoro‐bridged aluminum phthalocyanine polymer have been observed in the geometry of Maker fringe experiment using Nd:YAG laser fundamental light. Two types of films, single‐crystalline and polycrystalline films, with different orientations grown by the molecular‐beam epitaxy technique have been used. Observed dependence of the generated second‐ and third‐harmonic intensities on the polarization of light and the angle of incidence is discussed based on the symmetry of the film structures. Enhancement of the harmonic intensities is realized in the single‐crystalline film.

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