Phase-controlled electromagnetically induced symmetric and asymmetric grating in an asymmetric three-coupled quantum well

Naeimi, Ali Akbar; Darabi, Elham; Mortezapour, Ali; Naeimi, Ghasem

doi:10.1364/ao.58.009662

Cited by 8 publications

(4 citation statements)

References 55 publications

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“…54 , and in some specific cases in Ref. 24 . The type of asymmetric diffraction in our studies can be better explained by considering the constructive and destructive interference effect between the amplitude and phase modulations of the grating system, leading to diffracted photons only at positive or negative angles.…”

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confidence: 92%

“…In recent years it has been demonstrated, that in the PT-symmetric media it is possible to observe an asymmetric diffraction pattern since light undergoes spatially modulated refractive index 13 . The realization of one-and two-dimensional asymmetric gratings in optical PT-symmetric structures has drawn the attention of many research groups [14][15][16][17][18][19][20][21][22][23][24][25] .…”

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confidence: 99%

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Azimuthal modulation of electromagnetically induced grating using structured light

Asadpour

Kirova

Qian

et al. 2021

Sci Rep

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We propose a theoretical scheme for creating a two-dimensional Electromagnetically Induced Grating in a three-level $$\Lambda $$ Λ -type atomic system interacting with a weak probe field and two simultaneous position-dependent coupling fields—a two dimensional standing wave and an optical vortex beam. Upon derivation of the Maxwell wave equation, describing the dynamic response of the probe light in the atomic medium, we perform numerical calculations of the amplitude, phase modulations and Fraunhofer diffraction pattern of the probe field under different system parameters. We show that due to the azimuthal modulation of the Laguerre–Gaussian field, a two-dimensional asymmetric grating is observed, giving an increase of the zeroth and high orders of diffraction, thus transferring the probe energy to the high orders of direction. The asymmetry is especially seen in the case of combining a resonant probe with an off-resonant standing wave coupling and optical vortex fields. Unlike in previously reported asymmetric diffraction gratings for PT symmetric structures, the parity time symmetric structure is not necessary for the asymmetric diffraction grating presented here. The asymmetry is due to the constructive and destructive interference between the amplitude and phase modulations of the grating system, resulting in complete blocking of the diffracted photons at negative or positive angles, due to the coupling of the vortex beam. A detailed analysis of the probe field energy transfer to different orders of diffraction in the case of off-resonant standing wave coupling field proves the possibility of direct control over the performance of the grating.

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confidence: 92%

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confidence: 99%

Azimuthal modulation of electromagnetically induced grating using structured light

Asadpour

Kirova

Qian

et al. 2021

Sci Rep

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“…The basic Λ EIG scheme has been expanded to other multi-level schemes such as ∨ [12] and Ξ excitations [13]. Phase-controlled EIG can be realized in symmetric and asymmetric double and triple quantum wells and quantum dot systems [14][15][16], with efficiency, was enhanced via microwave modulation [17], and parity-time symmetry [18,19]. Theoretical schemes about EIG with PT symmetry were proposed in…”

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confidence: 99%

Effect of composite vortex beam on a two-dimensional gain assisted atomic grating

2023

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We propose an atomic grating based on an electromagnetically induced transparency phenomenon that switches between zeroth-order diffraction to a distinct higher-order diffraction pattern by driving a planar gaseous medium of a four-level tripod ($\pitchfork$) atoms with three laser beams: modulation of standing wave (SW) control beam propagating nearly perpendicular to the planar medium, while vortex and weak plane probe beams directed perpendicular to the medium. We numerically investigate the behavior of the amplitude, phase modulations, and probe field diffraction intensities of different orders by the variation of the field detunings and orbital angular momentum number (OAM) of the composite vortex light beam. Specifically, in the off-resonant case, the interplay between a square lattice of the control and an additional spatial variation of the vortex beam allows the emergence of higher diffraction orders and variable gain due to double transparency windows in this complex optical system. We believe that our proposed scheme might be useful in optical memory devices via the storage of information to diffraction orders of the atomic grating.

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“…It is well-known that the formed gratings in ordinary media typically diffract light symmetrically [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] whereas in PTsymmetric media, the light undergoes spatially modulated refractive index which can give rise to an asymmetric diffraction [41]. In recent years, the realization of one-dimensional and two-dimensional asymmetric gratings in optical PT-symmetry structures has drawn the attention of many researchers [41][42][43][44][45][46][47][48][49][50][51][52][53]. Among the aforementioned structures, the optical atomic lattices have received a considerable attention in which extensive research have been done [41][42][43][44][45][46][47][48][49].…”

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Phase-controlled Optical PT symmetry and asymmetric light diffraction in one- and two-dimensional optical lattices

et al. 2020

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We propose a novel scheme for asymmetric light diffraction of a weak probe field into a one-dimensional (1D) and two-dimensional (2D) lattice occupied with cold atoms. The atoms are driven into the double lambda-type configuration by a standing wave, two coupling laser fields and a probe. Our study suggests the proposed scheme is capable of forming an asymmetric diffraction as a result of inducing optical paritytime symmetry in both 1D and 2D lattices. Moreover it is demonstrated that the asymmetric pattern of diffraction can be dynamically manipulated by means of adjusting the relative phase. Furthermore it is revealed that in the case of 1D lattice (grating), variation of the intensities of the coupling fields has a significant impact on the intensity of diffraction orders in the uneven distribution of diffraction.

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Phase-controlled electromagnetically induced symmetric and asymmetric grating in an asymmetric three-coupled quantum well

Cited by 8 publications

References 55 publications

Azimuthal modulation of electromagnetically induced grating using structured light

Azimuthal modulation of electromagnetically induced grating using structured light

Effect of composite vortex beam on a two-dimensional gain assisted atomic grating

Phase-controlled Optical PT symmetry and asymmetric light diffraction in one- and two-dimensional optical lattices

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