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Polarization-controlled dynamical switching between transparency and absorption in a Zeeman-spilt Λ-type system.

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Title: Polarization-controlled dynamical switching between transparency and absorption in a Zeeman-spilt Λ-type system.
Authors: Liu, Yang1 (AUTHOR), Yan, Xiang-An1 (AUTHOR) yanxiangan0321@163.com, Yu, Ze-Kai1 (AUTHOR), Lv, Zi-Yang1 (AUTHOR), Song, Jia-Le1 (AUTHOR), Wu, Zi-Yi1 (AUTHOR), Wang, Xin1 (AUTHOR), Han, Xiao-Xiang1 (AUTHOR)
Source: International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics. 7/20/2026, Vol. 40 Issue 18, p1-12. 12p.
Subjects: Zeeman effect, Transparency (Optics), Optical modulation, Light propagation, Quantum interference, Optical polarization
Abstract: We report a simplified all-optical scheme that achieves dynamical switching between electromagnetically induced transparency (EIT) and absorption (EIA) in a Λ -type atomic system using only two lasers. The switch is controlled via the polarization ( σ + ∕ σ − ) and propagation direction of the optical fields. By applying a weak magnetic field, we spectroscopically resolve the degenerate transition into Zeeman-split subsystems and identify an effective N-type pathway as the physical origin of the switching. Theoretical analysis based on dressed-state perturbation theory reveals that the EIT–EIA transition results from constructive quantum interference between secondary dressed states. The scheme also generates tunable dual transparency windows, enabling potential applications in multi-channel signal routing and polarization-controlled slow-light devices. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:We report a simplified all-optical scheme that achieves dynamical switching between electromagnetically induced transparency (EIT) and absorption (EIA) in a Λ -type atomic system using only two lasers. The switch is controlled via the polarization ( σ + ∕ σ − ) and propagation direction of the optical fields. By applying a weak magnetic field, we spectroscopically resolve the degenerate transition into Zeeman-split subsystems and identify an effective N-type pathway as the physical origin of the switching. Theoretical analysis based on dressed-state perturbation theory reveals that the EIT–EIA transition results from constructive quantum interference between secondary dressed states. The scheme also generates tunable dual transparency windows, enabling potential applications in multi-channel signal routing and polarization-controlled slow-light devices. [ABSTRACT FROM AUTHOR]
ISSN:02179792
DOI:10.1142/S0217979226501742