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Laser Physics

Two-dimensional realization of electromagnetically induced phase grating in a quantum dot nanostructure

Khalid Mujasam Batoo, F. Al-dolaimy, Mohd Hafiz Mohd Zaid, Aisha A. Omran, S H Kareem, S Hussain, Adnan Hashim Abdulkadhim, Fadhil A. Rasen, Ahmed Hussien Alawadi, Ali Hashiem Alsaalamy

Published Sep 19, 2023• 1 citation
Publisher

Abstract

Abstract In this paper a novel method for electromagnetically induced phase grating in a quantum dot nanostructure is proposed. The four-level quantum dot nanostructure which is designed by solving the Schrödinger and Poisson equations. By size control of quantum dot and external voltage, one can obtain appropriate energy levels which can be interacted by four-optical fields. In this case, a probe, a two-dimensional standing wave and a driving field simultaneously interact by quantum dot for creation of coherent population trapping. A terahertz (THz) signal can influence the electron population in dark and bright levels, therefore optical susceptibility and transmission spectrum of probe field in the medium can be altered. In the presence of the THz field, the medium becomes phase dependent and this makes more of probe energy transfer to the higher order of the diffraction.

DOI
10.1088/1555-6611/acf70b

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Abstract The Fraunhofer diffraction pattern in a three-level quantum dot nanostructure is examined. A probe light, a two-dimensional standing wave field, and a weak signal light are the three optical laser fields that the graphene quantum dot interacts with them. The Fraunhofer diffraction pattern of the probe transmitted light has been addressed under two different coupling situations, including when the weak signal light into an optical vortex beam and a plane wave. The Fraunhofer diffraction pattern becomes symmetric for plane wave coupling light, and the diffracted light can be adjusted by the relative phase between applied lights. However, using the orbital angular momentum of light, it is possible to obtain an asymmetric diffraction pattern for optical light. It has been discovered that in both instances, phase modulation of the probe light’s transmission function allows the probe energy to move from zero order to higher orders.
Electromagnetically induced phase grating is theoretically investigated in the driven two-level quantum dot exciton system at the presence of the exciton-phonon interactions. Due to the phonon-induced coherent population oscillation, the dispersion and absorption spectra are sharply changed and the phase modulation is enhanced via the high refractive index with nearly-vanishing absorption, which could effectively diffract a weak probe light into the first-order direction with the help of a standing-wave control field. Moreover, the diffraction efficiency of the grating can be easily manipulated by controlling the Huang-Rhys factor representing the exciton-phonon coupling, the intensity and detuning of the control field, and the detuning of the probe field. The scheme we present has potential applications in the photon devices for optical-switching and optical-imaging in the micro-nano solid-state system.
Abstract In this paper, we study the Fraunhofer diffraction pattern in a four-level quantum dot nanostructure. The quantum dot interacts with two weak probe and signal laser fields and two strong coupling lights where one of them is a two-dimensional standing wave field. We study the Fraunhofer diffraction pattern of the transmitted probe light when the coherent driving light becomes plan wave or Laguerre Gaussian (LG) vortex light. We found that by controlling the relative phase of the applied lights and orbital angular momentum (OAM) of LG light, the Fraunhofer diffraction pattern can be controlled and the probe energy transfer from zero order to the higher orders, respectively. Moreover, we realized that by controlling the OAM number of the vortex light the asymmetric diffraction pattern is possible.
Abstract We theoretically study a two-dimensional electromagnetically induced phase grating in a four-level quantum system located near plasmonic metamaterials consisting of a periodic two-dimensional array of metal-coated dielectric nanospheres. The four-level quantum system interacts with a weak-probe laser field and a strong coherent coupling field with a standing-wave pattern. In the presence of plasmonic metamaterials the quantum system becomes sensitive to the relative phase between applied light. Therefore, the linear absorption and Kerr nonlinearity of the medium become phase dependent. Here, due to the standing-wave pattern of coupling light, an absorptive grating or phase grating can be formed in the quantum system. In our proposed model, we show that the diffraction efficiencies of the grating are related to the relative phase between applied fields, when the quantum system is located at different distances from plasmonic metamaterials.