https://doi.org/10.1140/epjp/s13360-021-01077-9
Regular Article
Tunable phase control of rotary photon drag by superposition of three probes coherence in atomic medium
1
Department of Physics, Hazara University Mansehra, Mansehra, Khyber Pakhtunkhwa, Pakistan
2
Department of Mathematic, University of Malakand, Chakdara Dir(L), Khyber Pakhtunkhwa, Pakistan
Received:
30
September
2020
Accepted:
6
January
2021
Published online:
20
January
2021
We use the superposition of three probes fields to modify the rotatory photon drag by strength and phases of the applied fields. Subluminal propagation is tuned to superluminal propagation with strength, phases of control field and superposition states. We measure a group index of 
with phases of the control fields and superposition states. The group velocity is modified to 
m/s in the medium. We investigate the rotary photon drag in the region positive and negative group velocity regions. Significant tunability of rotary photon drag is reported with the phases and strength of applied fields and superposition states. We note a maximum of 
micro-radians rotary photon drag in the medium. The significant tunability of photon drag from positive to negative values in micro-radians shows potential application in the spacial modes imaging coding.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021
