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Physical review. B, Condensed matter

Magnetic quenching of time-reversed light in photorefractive diluted magnetic semiconductors

M. Dinu, I. Miotkowski, David D. Nolte

Published Oct 15, 1998• 1 citation
Publisher

Abstract

Magnetic fields selectively quench phase conjugation during photorefractive four-wave mixing experiments in the diluted magnetic semiconductor ${\mathrm{Cd}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}.$ Phase conjugation using circularly polarized light fields differentiates between the time-reversed and non-time-reversed components of the four-wave mixing signal. The experimental results establish the connection between the removal of time-reversal symmetry in the solid state by magnetic fields and the magnetic-field-induced quenching of time-reversed phase-conjugate light.

DOI
10.1103/physrevb.58.10435

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Magnetic fields selectively quench phase conjugation during photorefractive four-wave mixing experiments in the diluted magnetic semiconductor Cd1\ensuremath−xMnxTe.{\mathrm{Cd}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}.Cd1\ensuremath−x​Mnx​Te. Phase conjugation using circularly polarized light fields differentiates between the time-reversed and non-time-reversed components of the four-wave mixing signal. The experimental results establish the connection between the removal of time-reversal symmetry in the solid state by magnetic fields and the magnetic-field-induced quenching of time-reversed phase-conjugate light.
Summary form only given. Phase conjugation is a nonlinear optical process that reverses the wavefront of a beam of light and which is mathematically analogous to the time-reversal of the wave. It is therefore natural to ask whether this analogy is physically significant. Because photons are bosons, quantum properties can emerge at the macroscopic level. Such a quantum-mechanical property is the geometric (Berry's) phase acquired by cycling a photon on a closed circuit in phase space (which for polarization states is the Poincare sphere). Berry's phase can be considered to be a record of the system history and therefore can be used to gain insight into its time-invariance properties. Also, the large magneto-optical effects experienced by photorefractive diluted magnetic semiconductors suggest a natural experimental situation for probing the nature of time reversal in phase conjugation by studying the effect of applied magnetic fields on phase-conjugate light. It has been previously shown that the application of a magnetic field leads to the quenching of the time-reversed polarization state of the phase-conjugate beam in four-wave mixing experiments. We propose an experiment to further explore the influence of magnetic fields on time reversal.
Photorefractive backward-wave four-wave mixing may be configured for the amplification of the phase conjugate output and the attenuation of the transmitted output. The nondegenerate-in-frequency interaction is studied in such a configuration, realized in a semiconductor CdTe crystal. The spectra measured at different outputs show the gain and attenuation resonances. The preliminary study of optical pulse propagation demonstrates that, due to different nonlinear dispersions at different outputs of the selected wave mixing configuration, a slowing down of light is observed at the phase conjugate output, while an acceleration of light is detected at the transmitted output for the same input pulse at the same interaction.
We explore dynamic media, such as plasmas and photorefractive materials, as generators of phase conjugated replicas of transient optical signals via four-wave mixing. The characterizing element of dynamic media is a population of free charge carriers that leads to induced charge density gratings on probe illumination. In steady-state conditions, phase conjugation in such media normally appears with smaller pump intensities than are required in Kerr media but at the expense of potentially slow response times.1