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Optics Communications

Mid-infrared efficient generation by resonant four-wave mixing in a three-coupled-quantum-well nanostructure

Xiangying Hao, Jiahua Li, Xiaoxue Yang

Published May 27, 2009• 33 citations
Publisher
DOI
10.1016/j.optcom.2009.05.015

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Frontiers in Physics•Jul 4, 2022•4 citations
We explore the generation of orbital angular momentum (OAM) carrying mid-infrared Bessel-Gaussian beams through nonlinear interactions within a non-uniformly broadened 85 Rb atomic ensemble. Utilizing an efficient four-wave mixing (FWM) scheme driven by two strong control fields and a weak probe field, we achieve coherent emission at a wavelength of 5.23 µm. By employing the density matrix approach, we obtain an analytical expression for the nonlinear atomic coherence involved in the four-wave mixing process, elucidating how the Bessel-Gaussian profile of the probe field is transferred into the mid-infrared signal. Numerical simulations of Maxwell’s wave equation ensure the generation of phase-matched, non-diffracting Bessel-Gaussian beams, which can be precisely controlled by manipulating the spatial susceptibility of the atomic medium. Furthermore, this study demonstrates the potential of higher-order Bessel-Gaussian beams with OAM to significantly advance applications in high-speed communication, biomedical imaging, and optical manipulation, owing to their robust beam integrity and enhanced data transmission capabilities in the mid-infrared spectrum.
We theoretically propose a scheme to measure the topological charge (TC) of a mid-infrared vortex beam via observing the intensity distribution of the four-wave mixing (FWM) field in an asymmetric semiconductor double quantum well. Due to the existence of Fano-type interferences, the special inherent interference takes place, and thus generates the interference-type phase and intensity patterns for the FWM field. Furthermore, it is demonstrated that the intensity and visibility of the interference-type intensity pattern can be drastically manipulated by adjusting the intensity and detuning the control field. Subsequently, we perform the TC measurement of the vortex driving field via directly monitoring the number of light spots of the FWM field. By choosing the suitable control parameters, the detectable value of the TC can reach to 120 with the visibility exceeding 0.97. Our scheme may provide the possibility for the realization of a mid-infrared OAM detector in a compact solid-state system.