Measurement of infrared optical constants with visible photons

Measurement of infrared optical constants with visible photons
Title:
Measurement of infrared optical constants with visible photons
Other Titles:
New Journal of Physics
Publication Date:
12 April 2018
Citation:
Anna Paterova et al 2018 New J. Phys. 20 043015
Abstract:
We demonstrate a new scheme for infrared spectroscopy with visible light sources and detectors. The technique relies on the nonlinear interference of correlated photons, produced via spontaneous parametric down conversion in a nonlinear crystal. Visible and infrared photons are split into two paths and the infrared photons interact with the sample under study. The photons are reflected back to the crystal, resembling a conventional Michelson interferometer. Interference of the visible photons is observed and it is dependent on the phases of all three interacting photons: pump, visible and infrared. The transmission coefficient and the refractive index of the sample in the infrared range can be inferred from the interference pattern of visible photons. The method does not require the use of potentially expensive and inefficient infrared detectors and sources, it can be applied to a broad variety of samples, and it does not require a priori knowledge of sample properties in the visible range.
License type:
http://creativecommons.org/licenses/by/4.0/
Funding Info:
The work is supported by DSI core funding and by the 'Quantum technologies for engineering' (QTE) program of A*STAR. AP would like to acknowledge the support of the SINGA PhD fellowship.
Description:
ISSN:
1367-2630
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