Using Mie Scattering to Determine the Wavelength-Dependent Refractive Index of Polystyrene Beads with Changing Temperature
Using Mie Scattering to Determine the Wavelength-Dependent Refractive Index of Polystyrene Beads with Changing Temperature
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DOI：
10.1021/acs.jpca.0c06121
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发表时间：
2020-11-19
影响因子：
2.9
通讯作者：
Ward, Andrew D.
中科院分区：
文献类型：
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作者：
McGrory, Megan R.;King, Martin D.;Ward, Andrew D.
在气溶胶科学中，聚苯乙烯珠常被用作测试颗粒。在这里，报告了一种非接触式技术，用于同时确定固体气溶胶颗粒的折射率作为波长和温度（20-234摄氏度）的函数。将直径为2 μ m的聚苯乙烯珠捕获在陶瓷加热元件中心孔的空气中，利用Mie光谱法测定了8个珠的半径和折射率（精度分别为0.8 nm和0.0014）作为加热和冷却的函数。折射率n是波长λ (0.480-0.650 μ m)和温度T（摄氏）的函数，被发现n = 1.5753 - (1.7336 X 10 (4)) T + (9.733 X 10(3))λ(-)(2)温度范围20 < T < 100度C和n = 1.5877 - (2.9739 X 10 (4)) T + (9.733 X 10(3))λ(2)100年温度范围< T < 234度C技术代表一个步骤测量材料的折射率的变化在一个扩展范围的温度和波长以绝对的方式和精度高。
Polystyrene beads are often used as test particles in aerosol science. Here, a contact-less technique is reported for determining the refractive index of a solid aerosol particle as a function of wavelength and temperature (20-234 degrees C) simultaneously. Polystyrene beads with a diameter of 2 mu m were optically trapped in air in the central orifice of a ceramic heating element, and Mie spectroscopy was used to determine the radius and refractive 1 54 index (to precisions of 0.8 nm and 0.0014) of eight beads as a function of heating and cooling. Refractive index, n, as a function of wavelength, lambda (0.480-0.650 mu m), and temperature, T, in centigrade, was found to be n = 1.5753 - (1.7336 X 10(-4))T + (9.733 x 10(-3))lambda(-)(2) in the temperature range 20 < T < 100 degrees C and n = 1.5877 - (2.9739 X 10(-4))T + (9.733 X 10(-3))lambda(-2) in the temperature range 100 < T < 234 degrees C. The technique represents a step change in measuring the refractive index of materials across an extended range of temperature and wavelength in an absolute manner and with high precision.