氟化氪準分子雷射蒸鍍摻硒化鋅玻璃薄膜之線性與非線性光學性質研究

Abstract

我們利用氟化氪準分子雷射蒸鍍含硒化鋅玻璃微晶薄膜於矽晶片及石英玻璃上。由螢光光譜中能隙的藍位移以及拉曼光譜第一階縱向光聲子模態振動頻率往低頻移動的現象，顯示了量子侷限效應的結果。由空間相關模型及拉曼光譜譜線估計同調長度，以描述硒化鋅微晶的品質。我們首次利用紫外，可見光穿透光譜來估計薄膜能隙，並且用Z－掃瞄求薄膜的n2值大小約為1.2×10-4esu。

ZnSe doped glass thin films were deposited on silicon and silica substrates by pulsed laser deposition from sol-gel prepared targets. The blue shift of the photoluminescence(PL) spectra and the first order longitudinal optical phonon Raman spectra shifting to low frequency have been observed exhibiting a result of quantum size effect .By spatial correaltion model and the first order longitudinal optical phonon Raman spectra, we can estimate the coherence length of the nanocrystallites to describe the quality of the thin film .For the first time, we used the UV-visible transmittance spectrum to evaluate bandgap and z-scan to evaluate n2~+1.2×10-4esu of the thin film.