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Optical constants of highly oriented oligothiophene films and nanoparticles

机译：高取向低聚噻吩薄膜和纳米粒子的光学常数

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摘要

The optical constants of vapor-deposited oligothiophene films in the wavelength range from 240 to 800 nm have been determined by measuring the angular resolved polarized transmission and reflection spectra and fitting the data to the Fresnel equations for uniaxial systems. In the region of the main absorption band the absorption coefficient normal to the surface reaches k_n ≈1.5, whereas hardly any absorption is found for the direction parallel to the surface. The component of the refractive index along the surface normal varies between n_n ≈ 3 on the low energy absorption edge and n_n ≈ 0.7 on the high energy side of the absorption band, while the component parallel to the surface shows only little dispersion. This anisotropy causes a blue-shift of the absorption maximum against solution by several thousands of wavenumbers. Very similar optical constants are round for colloidal oligothiophene nanoparticles by fitting the results of light scattering experiments to Mie-theory of anisotropic particles.
机译：通过测量角度分辨的偏振透射和反射光谱并将数据拟合到单轴系统的菲涅耳方程，可以确定在240至800 nm波长范围内的气相沉积低聚噻吩薄膜的光学常数。在主吸收带的区域中，垂直于表面的吸收系数达到k_n≈1.5，而在平行于表面的方向上几乎找不到任何吸收。沿表面法线的折射率分量在低能量吸收边缘的n_n≈3和吸收带的高能量侧的n_n≈0.7之间变化，而与表面平行的分量仅显示很小的色散。这种各向异性导致吸收最大值相对于溶液的蓝移了数千个波数。通过将光散射实验的结果与各向异性粒子的Mie理论进行拟合，胶体寡聚噻吩纳米粒子的光学常数非常相似。

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