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Title: Nonlinear infrared spectroscopy free from spectral selection
Authors: Paterova, Anna
Lung, Shaun
Kalashnikov, Dmitry A.
Krivitsky, Leonid A.
Keywords: Infrared spectroscopy
Quantum optics
Issue Date: 2017
Source: Paterova, A., Lung, S., Kalashnikov, D. A., & Krivitsky, L. A. (2017). Nonlinear infrared spectroscopy free from spectral selection. Scientific Reports, 7, 42608-.
Series/Report no.: Scientific Reports
Abstract: Infrared (IR) spectroscopy is an indispensable tool for many practical applications including material analysis and sensing. Existing IR spectroscopy techniques face challenges related to the inferior performance and the high cost of IR-grade components. Here, we develop a new method, which allows studying properties of materials in the IR range using only visible light optics and detectors. It is based on the nonlinear interference of entangled photons, generated via Spontaneous Parametric Down Conversion (SPDC). In our interferometer, the phase of the signal photon in the visible range depends on the phase of an entangled IR photon. When the IR photon is traveling through the media, its properties can be found from observations of the visible photon. We directly acquire the SPDC signal with a visible range CCD camera and use a numerical algorithm to infer the absorption coefficient and the refraction index of the sample in the IR range. Our method does not require the use of a spectrometer and a slit, thus it allows achieving higher signal-to-noise ratio than the earlier developed method.
ISSN: 2045-2322
DOI: 10.1038/srep42608
Schools: School of Electrical and Electronic Engineering 
Rights: © 2017 The Author(s) (Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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