arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.01565physics.opticsquant-ph
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指纹中红外宽带量子光谱

Broadband quantum spectroscopy at the fingerprint mid-infrared region

Anna V. Paterova, Zi S. D. Toa, Hongzhi Yang, Leonid A. Krivitsky

摘要:

许多分子在指纹红外(IR)区域显示出独特的吸收带,允许化学识别和检测。这使得红外光谱成为生物医学诊断、传感和材料表征的重要工具。然而,由于IR光源和光电探测器的相对较差的性能、对低温冷却的需求以及高成本,在IR范围内的测量是具有挑战性的。在这里,我们证明了中红外指纹的样品可以从测量中发现在近红外范围内使用传统的硅光电探测器。我们的方法依赖于强频率非简并参量下转换中产生的相关光子对的量子干涉。我们的技术同时测量吸收系数和折射率在广泛的指纹区域具有高精度。作为概念验证,我们在7.4-8.4 μm波长范围内对一氧化二氮气体进行光谱分析,并在865-877 nm范围内进行检测。这项工作将量子干涉测量的适用性扩展到一系列广泛的实际应用,例如大气污染物检测,呼吸诊断,化学安全等。

英文摘要:

Numerous molecules exhibit unique absorption bands in the fingerprint infrared (IR) region, allowing chemical identification and detection. This makes IR spectroscopy an essential tool in biomedical diagnostics, sensing, and material characterization. However, measurements in the IR range are challenging due to the relatively poor performance, need for cryogenic cooling, and high cost of IR light sources and photodetectors. Here, we demonstrate that the mid-IR fingerprints of the sample can be revealed from measurements in the near-IR range using conventional silicon photodetectors. Our approach relies on the quantum interference of correlated photon pairs produced in strongly frequency non-degenerate parametric down-conversion. Our technique simultaneously measures the absorption coefficient and refractive index in the broad fingerprint region with high accuracy. As a proof-of-concept, we perform spectroscopy of nitrous oxide gas in the 7.4-8.4 μm wavelength range, with the detection in the 865-877 nm range. This work extends the applicability of quantum interferometry to a range of broad practical appeals, such as detection of atmosphere pollutants, breath diagnostics, chemical safety, and others.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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