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

Ma, Dandan; Yu, Dongmin; Zhao, Xing-Dong; Qian, Jing

doi:10.1103/physreva.99.033826

Cited by 40 publications

(23 citation statements)

References 41 publications

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“…In contrast with previous studies [47][48][49], the transmission function, (9), depends not only on the linear potential but also on the nonlocal nonlinear potential and the intensity of the probe field.…”

Section: A General Results For Raman-nath Diffractioncontrasting

confidence: 73%

“…In addition to fundamental interest, the exploration of optical PT symmetry has facilitated various applications, including nonreciprocal light propagation and unidirectional invisibility [33][34][35], coherent perfect absorbers [36][37][38], giant light amplification [39], singlemode lasers [40,41], supersensitive sensors [42,43], and so on [44]. The combined effects of PT symmetry and optical gratings in the linear optics regime lead to many interesting phenomena, such as beam rectification and dynamic localization [45], spatially asymmetric light diffraction [46][47][48][49], and a new class of self-imaging Talbot effects [50].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear light diffraction by electromagnetically induced gratings with PT symmetry in a Rydberg atomic gas

Hang

Huang

2019

Phys. Rev. A

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Understanding and manipulating the non-Hermitian optical property based on coherent atomic gases is of great importance and has attracted much theoretical and experimental attentions. Advancing this study to the nonlinear optics regime is highly desirable due to its importance in fundamental physics and potential applications. In this work, we propose to realize a tunable electromagnetically induced grating (EIG) with parity-time (PT ) symmetry in a cold gas of Rydberg atoms, where interatomic interactions between Rydberg states are mapped to strong and long-range optical interactions, and investigate nonlinear light diffractions in this system. We show that for far-field diffraction, laser beams incident upon the PT -symmetric EIG display distinctive asymmetric diffraction fringes, which can be actively manipulated through tuning the gain-absorption coefficient of the EIG, the incident intensity of the laser beam, and the nonlocality provided by Rydberg atoms. For near-field diffraction, the nonlinear Talbot diffraction carpets emerge and can be modulated by PT symmetry in the presence of strong nonlocal interactions, allowing the realization of controllable optical self-imaging. The results are not only imperative for the study of non-Hermitian nonlinear optics but also useful for characterizing the interatomic interaction in Rydberg gases and for designing new optical devices useful in optical information processing and transmission.

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Section: A General Results For Raman-nath Diffractioncontrasting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Nonlinear light diffraction by electromagnetically induced gratings with PT symmetry in a Rydberg atomic gas

Hang

Huang

2019

Phys. Rev. A

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“…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]. Most of the above works hinge, however, on 1D Hermitian or non-Hermitian EIG structures.…”

Section: Introductionmentioning

confidence: 99%

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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“…The appearance of EIG with Rydberg atoms has also been discussed in Refs. 23 , 24 . It is worth mentioning that, in case of Rydberg atoms, one can obtain the phenomenon of EIG for the excited states wherein strong optical nonlinear effect is induced due to dipole-dipole interaction.…”

Section: Introductionmentioning

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

Cited by 40 publications

References 41 publications

Nonlinear light diffraction by electromagnetically induced gratings with PT symmetry in a Rydberg atomic gas

Nonlinear light diffraction by electromagnetically induced gratings with PT symmetry in a Rydberg atomic gas

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

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