掺半花菁二氧化硅薄膜光学二次谐波产生

SECOND HARMONIC GENERATION FROM UNPOLED HEMICYANINE DOPED SILICA THIN FILM

报道了用溶胶凝胶技术制备掺入半花菁染料的二氧化硅薄膜．在不加电场极化条件下，由半花菁分子的自取向导致光学二次谐波产生，定量测得厚度为５０ｎｍ薄膜的二阶非线性系数χ（２）为６６ｐｍ／Ｖ。

Hemicyanine doped silica film was fabricated by the sol gel technique.It was demonstrated for the first time that the self alignment of hemicyanine molecules in the above film existed in the interfacial area.A χ (2) value of 6 6pm/V was obtained for a 50nm thick film.