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Laser-induced Forward Transfer of Ag Nanopaste
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Microwave-induced orbital angular momentum transfer.

Zahra Amini Sabegh1, Mohammad Ali Maleki1, Mohammad Mahmoudi2

  • 1Department of Physics, University of Zanjan, University Blvd., 45371-38791, Zanjan, Iran.

Scientific Reports
|March 7, 2019
PubMed
Summary
This summary is machine-generated.

This study demonstrates microwave-induced orbital angular momentum (OAM) transfer in atomic systems. Researchers can switch generated pulses between subluminal and superluminal speeds, impacting quantum communication.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Nonlinear optics

Background:

  • Orbital angular momentum (OAM) transfer is crucial for advanced optical applications.
  • Laguerre-Gaussian (LG) beams carry OAM and are used in various light-matter interaction studies.
  • Controlling light propagation speed, like subluminal and superluminal regimes, is key for novel optical devices.

Purpose of the Study:

  • To investigate microwave-induced OAM transfer from an LG beam to a weak plane-wave.
  • To analyze the properties of the generated fourth field in a four-level atomic system.
  • To explore the switching between subluminal and superluminal pulse generation and its effect on OAM transfer.

Main Methods:

  • Analytical investigation of a closed-loop four-level ladder-type atomic system.
  • Utilizing Laguerre-Gaussian (LG) beams and plane-waves for OAM transfer.
  • Modulating relative phases of applied fields to control pulse velocity.

Main Results:

  • The generated fourth field is an LG beam with identical OAM to the applied LG field.
  • Microwave-induced subluminal pulses can be switched to superluminal pulses by altering the relative phase.
  • OAM transfer exhibits slight absorption in the subluminal regime and slight gain in the superluminal regime.

Conclusions:

  • The study successfully demonstrates OAM transfer and control over pulse group velocity in atomic systems.
  • The ability to switch between subluminal and superluminal regimes offers a method to control light-matter interactions.
  • This research paves the way for preparing high-dimensional Hilbert spaces, essential for quantum communication and information processing.