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A measurement method of the intrinsic optical absorption spectrum of 1D nanomaterials and its application to erbium chloride silicate nanowires

机译：1D纳米材料的固有光吸收光谱的测量方法及其在氯化铒硅酸盐纳米线中的应用

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Measurement of the absolute absorption coefficient of various nanomaterials over a wide spectral range is important for a variety of photonic applications but is very challenging due to strong scatterings from the intrinsically granular features of nanomaterials. We report in this paper a two-step method to determine the absorption spectrum on the absolute scale for an ensemble of nanowires: first, the relative absorption spectrum over a wide spectral range is measured from the nanowire ensemble in a carefully designed experiment using integrating sphere. Second, the absorption coefficient at a single wavelength is measured on a single nanowire to serve as the calibration of the relative spectrum. The combination of the two measurements allows the determination of the absolute absorption spectrum over a wide range. We then apply this measurement strategy to a relatively new class of nanowire materials, the erbium compound (erbium chloride silicate (ECS)) nanowires to determine its absorption spectrum. The absorption coefficient in a wide spectral range from near infrared to visible was determined for the first time for this unique erbium compound material. The measurement strategy is generally applicable to other 1D nanomaterials. The precise determination of the ECS absorption spectrum in such a wide spectral range is of vital importance to various applications of ECS nanowires including nanolasers, solar cells, and nanoscale amplifiers.
机译：在宽频谱范围内各种纳米材料的绝对吸收系数的测量对于各种光子应用是重要的，但由于纳米材料的本质上颗粒特征的强散射，非常具有挑战性。我们在本文中报告了一种两步的方法，用于确定纳米线集合的绝对尺度上的吸收光谱：首先，在使用集成球的精心设计的实验中，从纳米线集合中测量宽谱范围内的相对吸收光谱。其次，在单个纳米线上测量单个波长处的吸收系数，以用作相对光谱的校准。两种测量的组合允许在宽范围内确定绝对吸收光谱。然后，我们将该测量策略应用于相对较新的纳米线材料，铒化合物（氯化铒硅酸盐（ECS））纳米线确定其吸收光谱。对于这种独特的铒复合材料，首次测定从近红外到可见的近红外光谱范围内的吸收系数。测量策略通常适用于其他1D纳米材料。在这种宽的光谱范围内的ECS吸收光谱的精确测定对于ECS纳米线的各种应用具有至关重要的重要性，包括纳米载体，太阳能电池和纳米级放大器。

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