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首页> 外文期刊>Applied optics >Decoupling scattering and absorption of turbid samples using a simple empirical relation between coefficients of the Kubelka-Munk and radiative transfer theories
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Decoupling scattering and absorption of turbid samples using a simple empirical relation between coefficients of the Kubelka-Munk and radiative transfer theories

机译：使用Kubelka-Munk系数与辐射传递理论之间的简单经验关系解耦浑浊样品的散射和吸收

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摘要

Efforts are underway to better understand the absorption properties of micro- and nano-sized particles due to their potential in various photonic applications. However, most of these particles exhibit strong scattering in the spectral regions of interest in addition to absorption. Due to strong interference from scattering, the absorption of these turbid samples cannot be directly measured using conventional spectroscopy techniques. The optical properties of these particles are also different from that of the bulk due to quantum confinement and plasmon resonance effects and cannot be inferred from their bulk properties. By measuring the total transmittance and total reflectance (diffuse and collimated) of turbid samples and using an empirical relation between the coefficients of the Kubelka-Munk and radiative transfer theories, we have demonstrated a method to calculate the absorption and reduced scattering coefficients of turbid samples. This method is capable of extracting the absorption coefficient of turbid samples with an error of 2%. Using this method, we have decoupled the specific absorption and specific reduced scattering coefficients of commercially available micro-sized iron oxide particles. The current method can be used to measure the optical properties of irregularly shaped particle dispersions, which are otherwise difficult to estimate theoretically.
机译：由于它们在各种光子应用中的潜力，人们正在努力更好地理解微米和纳米尺寸的颗粒的吸收特性。但是，除了吸收以外，这些粒子中的大多数还表现出在感兴趣的光谱区域中的强散射。由于散射的强烈干扰，这些混浊样品的吸收无法使用常规光谱技术直接测量。由于量子限制和等离子体激元共振效应，这些颗粒的光学性质也不同于本体的光学性质，并且不能从其本体性质推断出。通过测量浑浊样品的总透射率和总反射率（漫射和准直），并利用Kubelka-Munk系数与辐射传递理论之间的经验关系，我们证明了一种计算浑浊样品吸收和降低散射系数的方法。该方法能够提取混浊样品的吸收系数，误差为2％。使用这种方法，我们已经将市售的微米级氧化铁颗粒的比吸收和比降低的散射系数解耦。当前的方法可以用于测量不规则形状的颗粒分散体的光学性质，否则该理论上难以估计。

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