Related papers: Quantum Fourier-transform infrared spectroscopy in the fingerprint region

Quantum Fourier-transform infrared spectroscopy in the fingerprint region

URL: http://arxiv.org/abs/2110.14247v1
Date: Wed, 27 Oct 2021 08:07:29 GMT
Title: Quantum Fourier-transform infrared spectroscopy in the fingerprint region
Authors: Yu Mukai, Ryo Okamoto, and Shigeki Takeuchi
Abstract summary: Experimental demonstrations have been limited to wavelengths shorter than 5 um or in the terahertz region, and have not been realized in the so-called fingerprint region of 1500- 500 cm-1. We report the experimental demonstration of quantum Fourier transform infrared (QFTIR) spectroscopy in the fingerprint region. These results open the way for new forms of spectroscopic devices based on quantum technologies.
Score: 0.5964436882344729
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Harnessing the quantum interference of photon-pair generation processes, infrared quantum absorption spectroscopy (IRQAS) can extract the infrared optical properties of a sample through visible or near-infrared photon detection without the need for an infrared optical source or detector, which has been an obstacle for higher sensitivity and spectrometer miniaturization. However, experimental demonstrations have been limited to wavelengths shorter than 5 um or in the terahertz region, and have not been realized in the so-called fingerprint region of 1500- 500 cm^-1 (6.6 to 20 um), which is commonly used to identify chemical compounds or molecules. Here we report the experimental demonstration of quantum Fourier transform infrared (QFTIR) spectroscopy in the fingerprint region, by which both absorption and phase spectra (complex spectra) can be obtained from Fourier transformed quantum interferograms obtained with a single pixel visible-light detector. As demonstrations, we obtained the transmittance spectrum of a silicon wafer at around 10 um (1000 cm^-1) and complex transmittance spectrum of a synthetic fluoropolymer sheet, polytetrafluoroethylene, in the wavelength range of 8 to 10.5 um (1250 to 950 cm^-1), where absorption due to symmetric and asymmetric stretching modes of C-F bonds is clearly observed. The signal-to-noise ratio per unit spectral width and unit probe light intensity of our QFTIR spectroscopy method outperforms conventional FTIR spectroscopy by a factor of 10^2. These results open the way for new forms of spectroscopic devices based on quantum technologies.

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