红外线的
光学
可见光谱
光子
材料科学
光谱学
吸收(声学)
红外光谱学
光电子学
折射率
物理
化学
量子力学
有机化学
作者
Dmitry Kalashnikov,Anna V. Paterova,S. P. Kulik,Leonid A. Krivitsky
出处
期刊:Nature Photonics
[Nature Portfolio]
日期:2016-01-04
卷期号:10 (2): 98-101
被引量:305
标识
DOI:10.1038/nphoton.2015.252
摘要
The refractive index and absorption coefficient of a medium in the infrared range are measured using visible spectral range components. The technique relies on nonlinear interference of infrared and visible photons, produced by down-conversion. Spectral measurements in the infrared optical range provide unique fingerprints of materials, which are useful for material analysis, environmental sensing and health diagnostics1. Current infrared spectroscopy techniques require the use of optical equipment suited for operation in the infrared range, components of which face challenges of inferior performance and high cost. Here, we develop a technique that allows spectral measurements in the infrared range using visible-spectral-range components. The technique is based on nonlinear interference of infrared and visible photons, produced via spontaneous parametric down conversion2,3. The intensity interference pattern for a visible photon depends on the phase of an infrared photon travelling through a medium. This allows the absorption coefficient and refractive index of the medium in the infrared range to be determined from the measurements of visible photons. The technique can substitute and/or complement conventional infrared spectroscopy and refractometry techniques, as it uses well-developed components for the visible range.
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