Asymmetric light diffraction of an atomic grating with PT symmetry

Liu, Yi-Mou; Gao, Feng; Fan, Chu-Hui; Wu, Jin-Hui

doi:10.1364/ol.42.004283

Cited by 53 publications

(30 citation statements)

References 44 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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“…Motivated by a recent work [25] where authors exploited an asymmetric EIG with parity-time symmetry to the coupling field breaking the parity of absorption, and realized to diffract the probe field into either negative or positive angles, we propose a new approach for achieving an exotic Rydberg-EIG with perfect unidirectional and higher-order diffraction. The key lies in introducing a suitable periodic modulation to the twophoton detuning in order to break the parity of dispersion, arising a position-dependent modulation to the energy of Rydberg level aside from the vdWs shift.…”

Section: Introductionmentioning

confidence: 99%

Unidirectional and controllable higher-order diffraction by a Rydberg electromagnetically induced grating

Zhao

et al. 2019

Phys. Rev. A

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A method for diffracting the weak probe beam into unidirectional and higher-order directions is proposed via a novel Rydberg electromagnetically induced grating, providing a new way for the implementations of quantum devices with cold Rydberg atoms. The proposed scheme utilizes a suitable and position-dependent adjustment to the two-photon detuning besides the modulation of the standing-wave coupling field, bringing a in-phase modulation which can change the parity of the dispersion. We observe that when the modulation amplitude is appropriate, a perfect unidirectional diffraction grating can be realized. In addition, due to the mutual effect between the van der Waals (vdWs) interaction and the atom-field interaction length that deeply improves the dispersion of the medium, the probe energy can be counter-intuitively transferred into higher-order diffractions as increasing the vdWs interaction, leading to the realization of a controllable higher-order diffraction grating via strong blockade.

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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: 84%

“…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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Asymmetric light diffraction of an atomic grating with PT symmetry

Cited by 53 publications

References 44 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

Unidirectional and controllable higher-order diffraction by a Rydberg electromagnetically induced grating

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

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