Hyperspectral infrared laser polarimetry for single-shot phase-amplitude imaging of thin films.
Hyperspectral infrared laser polarimetry for single-shot phase-amplitude imaging of thin films.
复制标题
用于薄膜单次相位振幅成像的高光谱红外激光偏振测量。
DOI：
10.1364/ol.44.004893
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发表时间：
2019
期刊：
影响因子：
3.6
通讯作者：
K. Hinrichs
中科院分区：
文献类型：
--
作者：
A. Furchner;C. Kratz;J. Rappich;K. Hinrichs
我们最近提出了一种新的基于激光的红外(IR)光谱相位幅度偏振仪，用于有机薄膜的亚分秒和亚毫米~2测量。Lett.44,4387(2019年)OPLEDP0146-959210.1364/OL.44.004387]。在这里，我们报告了这种设备的高光谱成像能力。该单射偏振仪采用了可宽调谐的中红外(1318-1765 cm-1)量子级联激光器和四通道分束设计，用于同时测量相位和幅度。高达1500 cm-1的快速QCL调谐速度/S能够在几十分钟内实现大样本区域(50×50 mm)的高光谱映射，达到120μm空间和<；0.5 cm-1的光谱分辨率。我们应用该仪器对亚100 nm薄聚合物和脂肪酸膜的非均相化学和结构特性进行成像。我们的旋光仪为复杂薄膜的横向分辨红外分析开辟了新的应用。
We recently presented a novel laser-based infrared (IR) spectroscopic phase-amplitude polarimeter for sub-decisecond and sub-mm2 measurements of organic thin films [Opt. Lett.44, 4387 (2019)OPLEDP0146-959210.1364/OL.44.004387]. Here we report on the hyperspectral-imaging capabilities of this device. The single-shot polarimeter employs a broadly tunable mid-IR (1318-1765 cm-1) quantum cascade laser (QCL) and a four-channel beam-division design for simultaneous phase and amplitude measurements. Fast QCL tuning speeds of up to 1500 cm-1/s enable hyperspectral mapping of large sample areas (50×50 mm2) within several tens of minutes, achieving 120 μm spatial and <0.5 cm-1 spectral resolution. We apply the instrument for imaging both the heterogeneous chemical and structural properties of sub-100 nm thin polymer and fatty-acid films. Our polarimeter opens up new applications regarding laterally resolved IR analyses of complex thin films.