Prof. Shigeki Takeuchi, Department of Electronic Science and Engineering, Kyoto University, Japan

Library, A.2.500, Staudtstr. 2

Location details

Abstract:

Harnessing the quantum interference between generation processes of visible-infrared photon pairs, infrared quantum absorption spectroscopy (QIRS) enables the estimation of the optical properties of a medium in the infrared region from interferograms obtained by detecting visible photons[1,2]. Since QIRS enables infrared spectroscopy without using a light source or detector in the infrared region, infrared spectrometers can be made more compact and less invasive, which will find many alternative applications. A broader spectroscopy bandwidth is critical; however, the spectral bandwidths of the reported QIRS system have been limited to less than about 1 μm. 
Here, we report our recent efforts for ultra-broadband QIRS. The first topic is the realization of a wavelength-tunable IRQAS system covering the spectral range of 1.9–5.2 μm with a bandwidth of 3.3 μm [3]. Rapid spectral measurements (coarse scan) over the broad bandwidth (1.9–5.2 μm) is successfully demonstrated. The second topic concerns the realization of ultra-broadband visible-infrared photon pairs. Using quasi-phase-matched (QPM) devices with the chirped polling periods, we have successfully observed the correlated photon pairs over a broad bandwidth ( 2-5 μm). In this talk, we will report the latest progress in applying these devices for QIRS[4]. If time allows, we will briefly introduce our recent demonstration of QIRS in the fingerprint region [5], Effect on spectral resolution on QIRS with pulse laser excitation[6], and other related works on the efficient broadband entangled photon-pair sources[7,8] and their applications for photonic quantum sensing.

We thank Prof. Kurimura at NIMS and Mr. Tokuda and Mr. Hisamitsu at Shimadzu Co. for their collaborations. These works are supported in part by MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) Grant No. JPMXS0118067634, Cabinet Office, Government of Japan, JST-CREST Grant No. JPMJCR1674 and JSPS KAKENHI Grant No. 24H00195.

References
[1] D. Y. Korystov, S. P. Kulik, and A. N. Penin, JETP Lett. 73, 214 (2001).
[2] D. A. Kalashnikov, A. V. Paterova, S. P. Kulik, and L. A. Krivitsky, Nat. Photonics 10, 98 (2016).
[3] M. Arahata, Y. Mukai, T. Tashima, R. Okamoto, and S. Takeuchi, Phys. Rev. Appl. 18, 034015 (2022).
[4] T. Tashima, Y. Mukai, M. Arahata, N. Oda, M. Hisamitsu, K. Tokuda, R. Okamoto and S. Takeuchi, OPTICA, 11, 81 (2024).
[5] Y. Mukai, R. Okamoto, and S. Takeuchi, Opt. Express 30, 22624 (2022).
[6] J. Kaur, Y. Mukai, R. Okamoto, and S. Takeuchi, Phys. Rev. A 108, 063714 (2023)
[7] B. Cao, M. Hisamitsu, K. Tokuda, S. Kurimura, R. Okamoto, and S. Takeuchi, Opt. Express 29, 21615 (2021).
[8] B. Cao, K. Hayama, S. Suezawa, M. Hisamitsu, K. Tokuda, S. Kurimura, R. Okamoto, and S.Takeuchi, Opt. Express 31, 23551-23562 (2023)