Asymmetric diffraction by atomic gratings with optical 
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 symmetry in the Raman-Nath regime

Shui, Tao; Yang, Wenxing; Liu, Shaopeng; Li, Ling; Zhu, Zhonghu

doi:10.1103/physreva.97.033819

Cited by 63 publications

(33 citation statements)

References 61 publications

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“…In fact, unconventional optical modulations on EIG structures have recently been brought to the development of cooperative nonlinear gratings and non-Hermitian gratings. Cooperative nonlinear gratings allow one to distinguish light fields of different photon statistics with the dipole blockade effect of Rydberg atoms [41,42], while non-Hermitian gratings typically result in asymmetric diffraction patterns that can be tuned through the out-of-phase interplay of phase and amplitude modulations [43][44][45][46]. Unidirectional and controlled higher-order diffraction, through non-Hermitian modulations on EIG structures built from Rydberg atoms driven beyond the dipole blockade regime, has also been reported [47].…”

Section: Introductionmentioning

confidence: 98%

Lopsided diffractions of distinct symmetries in two-dimensional non-Hermitian optical gratings

Liu

Gao

et al. 2019

Phys. Rev. A

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Fraunhofer light diffraction across a thin two-dimensional lattice of cold atoms subject to transverse hybrid modulations of two standing-wave crossed pump fields is seen to yield lopsided patterns of various degrees of symmetry. We show that one can fully restrain the diffraction of a weak incident probe to two diagonal or adjacent quadrants or even just to a single quadrant, depending on the phases of two standing-wave pumps and on the probe detuning. Different diffraction symmetries with respect to the axes or diagonals of the diffraction plane quadrants are interpreted here in terms of different out-of-phase interplay of absorption and dispersion periodic distributions, resulting from different combinations of Hermitian, PT-symmetric, and non-Hermitian modulations.

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Section: Introductionmentioning

confidence: 98%

Lopsided diffractions of distinct symmetries in two-dimensional non-Hermitian optical gratings

Liu

Gao

et al. 2019

Phys. Rev. A

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“…Evolution of optical -symmetry has been employed to construct EIG in Raman-Nath regime as investigated in Ref. 30 , 31 . Cross-grating like structures based on two-dimensional (2D) EIG is described in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Raman-Nath regime as investigated in Ref. 30,31 . Cross-grating like structures based on two-dimensional (2D) EIG is described in Refs.…”

mentioning

confidence: 99%

Multi-wave-mixing-induced nonlinear modulation of diffraction peaks in an opto-atomic grating

Dutta¹,

Panchadhyayee

Bayal

et al. 2020

Sci Rep

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We propose an atomic model in close-loop configuration, which exhibits controllable symmetric and asymmetric evolution of significantly enhanced diffraction peaks of the weak probe beam in an opto-atomic grating at far-field regime. Such results are obtained by the linear and nonlinear modulation of the intensities of the diffraction peaks as a result of multi-wave-mixing-induced modification of spatially modulated coherence in a closed four-level atomic system. Novelty of the results lies in predicting the diffraction pattern with uniform peak height due to the dominance of the amplitude part of the grating-transfer-function at the condition of exact atom-field resonance, which is unique to the present model. Efficacy of the present scheme is to apply it in producing nonlinear light generated by four-wave-mixing-induced control of spatially modulated coherence effect. The work also finds its importance for its applicability in the field of all-optical devices.

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“…Due to this reason the kinetic-energy term is not included in the Hamiltonian (expression (1)) and the probability corresponding to the centre-of-mass wave function ψ CM of the atom can be considered as stationary. Viability of such approximation is confirmed in the formation of atomic gratings at Raman-Nath diffraction regime 38,39 .…”

Section: Theoretical Formulationmentioning

confidence: 80%

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Dutta¹,

Panchadhyayee

Bayal³

et al. 2020

Sci Rep

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A new approach for achieving two-dimensional (2D) atom localization microscopy based on the projection of three-dimensional (3D) localization in the plane of the detector is described in the present work. Spatial variation of the position-dependent 2D-localization pattern in the xy-plane is obtained with the shifting of the position of the detector along the z-axis under the parallel-and cross-axis configurations of the standing-wave fields. An attempt is made to study the 2D-localization characteristics in the specific parametric conditions for which the localization structures evolve with different shapes eventually leading to 100% detection probability of the atom both in the subwavelength and sub-half-wavelength regimes. The scope of tuning the cross-axis configuration over a wide range adds novelty and robustness to this model. Apart from the 2D-localization, various localization patterns with eight-to single-peak structures appear as interesting outcomes through the efficient manipulation of control parameters in the study of one-dimensional (1D) atom localization. The application of the traveling-wave field or its equivalent appears to be unique in achieving high-precision localization with maximal probability (100%) in both the 1D and 2D field-configuration schemes. Proper tuning of the traveling wave accompanied by the standing wave in the 1D scheme results in the singlepeak localization in the sub-half-wavelength range. As a whole, the present work seems to be very much efficient for high-precision optical lithography.

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Asymmetric diffraction by atomic gratings with optical PT symmetry in the Raman-Nath regime

Cited by 63 publications

References 61 publications

Lopsided diffractions of distinct symmetries in two-dimensional non-Hermitian optical gratings

Lopsided diffractions of distinct symmetries in two-dimensional non-Hermitian optical gratings

Multi-wave-mixing-induced nonlinear modulation of diffraction peaks in an opto-atomic grating

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

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