https://doi.org/10.1140/epjp/s13360-025-06763-6
Regular Article
Influence of spin-orbit coupling mode of vector vortex beam on the electromagnetically induced transparency and absorption in rubidium vapor
Department of Physics, Aliah University, IIA/27, New Town, 700 160, Kolkata, India
Received:
14
April
2025
Accepted:
17
August
2025
Published online:
5
September
2025
In this article, we experimentally study the influence of the vector vortex beam (VVB)-assisted spin-orbit coupling (SOC) mode on the electromagnetically induced transparency (EIT) and absorption (EIA) spectra in multi-level 
- and V-type schemes formed by 
Rb-D
hyperfine transitions. We have observed that the coherent signals (EIT and EIA) formed in the Doppler-broadened non-vortex probe absorption profile are significantly modulated by the orbital angular momentum (OAM) of the pump VVB. Furthermore, it is shown that the resolution of these coherent signals can be maximized by adjusting the ratio of the pump-probe fields strength for each OAM number. It is also found that each OAM corresponds to a unique pump-probe strength ratio at which the EIT and EIA signals attain their maximum amplitude. The experimental results regarding the substantial modulation of the atomic coherent signals with the variation of OAM indicate that the subluminal (slow light) and superluminal (fast light) propagation of the non-vortex probe beam inside an atomic medium can efficiently be controlled by the SOC mode of the pump VVB.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
