首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Photochromic and photomechanical responses of an amorphous diarylethene-based polymer: a spectroscopic ellipsometry investigation of ultrathin films
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Photochromic and photomechanical responses of an amorphous diarylethene-based polymer: a spectroscopic ellipsometry investigation of ultrathin films

机译:非晶态二芳基乙烯基聚合物的光致变色和光机械响应:超薄膜的椭圆偏振光谱研究

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This work deals with very thin (14-40 nm) films of a polyester containing diarylethene units in the main chain spin cast on a silicon wafer. By irradiation with UV light the colourless form turns blue due to the appearance of a strong absorption band centred at about 600 nm. The coloured state is thermally stable and the backward conversion can be triggered with visible light. Comparison of broadband (245-1700 nm) spectroscopic ellipsometry data with simulations based on an isotropic, Kramers-Kronig consistent, multiple-resonance model allowed us to determine the complex index of refraction n of the film in its blue and colourless forms. The refractive index of the blue phase neatly exceeds that of the transparent form for wavelengths in the NiR. In particular, out of resonance, at λ ~ 1700 nm, ΔRe(n) ~ 0.05. Parallel to the iRe(n) increase, the analysis of ellipsometry data suggests a decrease of the film thickness (about 1.5%) during the transition from the open (transparent) to the closed (coloured) form.
机译:这项工作处理的是在硅片上旋铸的主链中含有二芳基乙烯单元的聚酯薄膜(14-40 nm)。通过用紫外光照射,由于出现了以约600 nm为中心的强吸收带,无色形式变为蓝色。着色状态是热稳定的,并且可以用可见光触发向后转换。将宽带(245-1700 nm)椭圆偏振光谱数据与基于各向同性Kramers-Kronig一致多共振模型的模拟进行比较,可以确定薄膜蓝色和无色形式的折射率n。对于NiR中的波长,蓝相的折射率完全超过透明形式的折射率。特别是,在λ〜1700 nm处没有共振,ΔRe(n)〜0.05。与iRe(n)增加平行,椭圆偏振数据分析表明从开放(透明)形式到闭合(彩色)形式的转变期间膜厚度的减少(约1.5%)。

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