Frequency tunable superflash based on an electromagnetically induced transparency (EIT)

Rahman, Abdul and Lee, Chang-Won and Jeong, Heejeong (2022) Frequency tunable superflash based on an electromagnetically induced transparency (EIT). Optics Express, 30 (15). pp. 26570-26580. ISSN 1094-4087, DOI

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We present a new controllable superflash, a maximum transient peak at the falling edge of a square pulse, using a three-level electromagnetically induced transparency (EIT). The superflash in a two-level system occurs at a certain value of the detuning of the probe laser (Delta(peak)) when the optical depth (OD) of the medium is sufficiently large and constant. Here, we show the external tunability of the Delta(peak )for obtaining the maximum transient peak by introducing a three-level EIT. Owing to the EIT dispersion properties, we effectively tune the phase of the forward-scattered light (E-s) by externally controlling the EIT coupling light intensities associated with the Rabi frequency (Omega(c)). When the incident light is turned off, the total transmitted field (E-t) experiences an out-of-phase shift, producing a peak intensity that is three times higher than the input. We observe that this new class of superflash (Type II) occurs near the Err window and exhibits inverse-linearity of the OD, which is in contrast with the characteristics of the previously reported two-level superflash (Type I). Furthermore, we find the quadratic nature of tunability in Delta(peak)(Omega(c)).The new tunability of the superflash by the Rabi frequency may facilitate more rapid and effective control of the superflash compared to a passive optical medium. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Item Type: Article
Funders: National Research Foundation of Korea (Grant No: NRF-2019K1A3A1A14064815 & NRF-2020R1I1A3071811), Universiti Malaya (Grant No: IIRG001A-19FNW), National Research Foundation of Korea (Grant No: 2019K1A3A1A14064815)
Uncontrolled Keywords: Optical precursors
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Nov 2023 03:49
Last Modified: 08 Nov 2023 03:49

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