Programme

P.42 -- Poster, VCTP-48

Date: Thursday, 3 August 2023

Time: 08:30 - 10:00

Influence of Kerr nonlinearity on electromagnetically induced grating in a three-level lambda-type atomic system

Le Van Doai, Luong Thi Yen Nga and Ho Hai Quang

Vinh University, 182 Le Duan Street, Vinh City, Vietnam

Diffraction grating is commonly used as dispersive elements in many optical systems for applications including spectrometers, switching, tuning and trimming elements in dense wavelength-division multiplexing, visual display technology, external cavity lasers, etc., [1]. The diffraction efficiency of grating is an important parameter since it will strongly influence the final energy delivered by the optical diffraction system. The coherent interaction between the laser fields with the atom can lead to quantum interference of transition probabilities within the atomic system. The consequence of this quantum interference is to suppress (destructive interference) or enhance (constructive interference) the total transition probability and thus radically change the absorption or transmission property of the atomic medium for a light field. The constructive interference of transition probabilities generates electromagnetically induced transparency (EIT) [2]. Under the EIT condition, the medium forms peculiar optical properties and thus it offers unusual applications such as [3] giant nonlinearity, low threshold optical bistability, and so on. Currently, based on the EIT effect, an atom sample can behave like a diffraction grating which is called an electromagnetically induced grating (EIG) [4]. EIG was first proposed in 1998 [4] and experimentally verified in 1999 [5]. Since then, theoretical and experimental studies of EIG have attracted great attentions [6-10] due to their potential applications in many fields, such as atoms velocimetry [11], light storage [12], beam splitting and fanning [13], shaping a biphoton spectrum [14], controlling multi-wave mixing processes [15], angular Talbot effect [16] and giant Goos–Hänchen shifts [17]. Recently, EIG efficiency has been greatly improved in different atomic systems with the support of other external fields such as microwave field [18] and magnetic field [19], Kerr nonlinearity [20]. In this work, we study the influence of giant Kerr nonlinearity on diffraction pattern of EIG in a three-level lambda-type atomic system. It shows that the efficiency of EIG is significantly improved in the presence of Kerr nonlinearity. The influence of pump laser parameters on EIG efficiency is also considered. References [1] N. Bonod, J. Neauport, “Diffraction gratings: from principles to applications in high-intensity lasers”, Adv. Opt. Photon. 8, 156-199 (2016). [2] K. J. Boller, A. Imamoglu, S.E. Harris, Observation of electromagnetically induced transparency, Phys. Rev. Lett. 66, 2593 (1991). [3] H. Ling, Y.-Q. Li, and M. Xiao, “Electromagnetically induced grating: homogeneously broadened medium,” Phys. Rev. A 57, 1338-1344 (1998). [4] N. H. Bang, L. V. Doai and D. X Khoa, “Controllable optical properties of multiple electromagnetically induced transparency in gaseous atomic media”, Comm. Phys. 28, 1-33 (2019). [5] M. Mitsunaga and N. Imoto, “Observation of an electromagnetically induced grating in cold sodium atoms,” Phys. Rev. A 59, 4773-4776 (1999). [6] G. Cardoso and J. Tabosa, “Electromagnetically induced gratings in a degenerate open two-level system,” Phys. Rev. A 65, 033803 (2002). [7] B. K. Dutta and P. K. Mahapatra, “Electromagnetically induced grating in a three-level -type system driven by a strong standing wave pump and weak probe fields”, J. Phys. B: At. Mol. Opt. Phys. 39, 1145-1157 (2006). [8] S. A. Carvalho and L. E. E. de Araujo, “Electromagnetically induced blazed grating at low light levels”, Phys. Rev. A 83, 053825 (2011). [9] S. Asghar, Ziauddin, S. Qamar, and S. Qamar, “Electromagnetically induced grating with Rydberg atoms”, Phys. Rev. A 94, 033823 (2016). [10] T. Naseri, “Optical properties and electromagnetically induced grating in a hybrid semiconductor quantum dot-metallic nanorod system”, Physics Letters A 384, 126164 (2020). [11] J. W. Tabosa, A. Lezama, and G. Cardoso, “Transient Bragg diffraction by a transferred population grating: application for cold atoms velocimetry,” Opt. Commun. 165, 59-64 (1999). [12] D. Moretti, D. Felinto, J. W. R. Tabosa, “Dynamics of a stored Zeeman coherence grating in an external magnetic field”, J. Phys. B 43, 115502 (2010). [13] L. Zhao, W. Duan, and S. F. Yelin, “All-optical beam control with high speed using image-induced blazed gratings in coherent media,” Phys. Rev. A 82, 013809 (2010). [14] J. Wen, Y. H. Zhai, S. Du, and M. Xiao, “Engineering biphoton wave packets with an electromagnetically induced grating,” Phys. Rev. A 82, 043814 (2010). [15] Y. Zhang, Zh. Wu, X. Yao, Zh. Zhang, H. Chen, H. Zhang, and Y. Zhang, “Controlling multi-wave mixing signals via photonic band gap of electromagnetically induced absorption grating in atomic media,” Opt. Express 21, 29338-29349 (2013). [16] T. Qiu and G. Yang, “Electromagnetically induced angular Talbot effect”, J. Phys. B: At. Mol. Opt. 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Presenter: Doai Van Le