Guske Joshua T, Brown Jeff, Welsh Alex, Franzen Stefan
Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North Carolina 27695-8204, USA.
Opt Express. 2012 Oct 8;20(21):23215-26. doi: 10.1364/OE.20.023215.
Near-infrared surface plasmon resonance (SPR) spectra were collected of thin multilayer films of aluminum-doped zinc oxide (AZO) / silver (Ag) / AZO on BK-7 glass in the Kretschmann configuration in air, with the silver layer thickness varying from 5 nm to 50 nm. The SPR results were interpreted by modeling the reflectance with a five-layer transfer-matrix method, with the aid of a simplex algorithm. The model indicated that the Ag plasma frequency was significantly higher than the bulk value, possibly due to Schottky effect charge transfer from the AZO to the Ag layer. Continuous silver films were made as thin as 10 nm, indicating an inhibition of metal island formation for Ag deposited on AZO.
在空气中，采用Kretschmann配置，收集了BK-7玻璃上铝掺杂氧化锌（AZO）/银（Ag）/AZO多层薄膜的近红外表面等离子体共振（SPR）光谱，银层厚度从5纳米变化到50纳米。借助单纯形算法，用五层传输矩阵法对反射率进行建模，从而解释SPR结果。该模型表明，Ag等离子体频率明显高于体值，这可能是由于肖特基效应导致电荷从AZO转移到Ag层。连续银膜可制作得薄至10纳米，这表明沉积在AZO上的Ag抑制了金属岛的形成。
