Infrared metrology with visible photons

报告题目：Infrared metrology with visible photons

报告人：Prof. Leonid A. Krivitsky

主持人：Prof. Konstantin Dorfman

时间：10月17日（周三）下午3:00

地点：理科大楼A814会议室

主办单位：精密光谱科学与技术国家重点实验室

报告摘要：

Infrared (IR) optical range is an important fingerprint region where a variety of media has distinctive absorption lines. That is why it is widely used for material characterization and analysis in pharma, bio-medical and petrochemical industries. Although conventional methods of IR measurements such as Fourier transform IR spectroscopy are well developed, there are remaining challenges associated with high cost and low efficiency of IR light sources and detectors. Here we show that by exploiting effects of nonlinear and quantum optics it is possible to overcome this challenge and retrieve properties of the materials in the IR range from measurements of visible range photons.

Our approach is based on the nonclassical interference of frequency correlated photons produced via spontaneous parametric down conversion (SPDC) [1]. Within this process, one of the photons is generated in the detection-friendly visible range, and its correlated counterpart in the IR range is used to probe properties of the medium. The interference fringes observed for the visible photon depend on the properties of the IR photon, traveling through the sample. We build a nonlinear analog of a Michelson interferometer and demonstrate the absorption spectroscopy [3, 4], optical coherence tomography (OCT) and imaging [5] in the IR range when the actual measurements are performed in the visible range.

References

[1]X. Y. Zou, I. J.Wang, and L. Mandel, Phys. Rev. A 67(3), 318-321 (1991).

[2] D. Kalashnikov, A. Paterova, S. Kulik, L. Krivitsky, Nature Photonics 10, 98 (2016).

[3] A. Paterova, S. Lung, D. Kalashnikov, L. Krivitsky, Scientific reports 7, 42608 (2017).

[4] A. Paterova et al. New Journal of Physics 20 (4), 043015 (2018).

[5] A. Paterova et. al., Quantum Science and Technology 3 025008 , 2018

报告人简介:

Leonid Krivitsky obtained his PhD from Moscow State University in 2005 with specialization in experimental quantum optics. Then he worked as a postdoc in Turin (INRiM), Erlangen(MPL) and Copenhagen (DTU). In 2008 he moved to A*STAR in Singapore, where he started his research group. He realized the first interface between the single photon source and live retinal photoreceptor, which lead to the demonstration of single photon sensitivity of photoreceptors. He also realized the nonlinear spectroscopy method which allows characterization of samples in the infrared range using visible light optics.