Tailored diffraction asymmetries from spatially odd-symmetric phase gratings

Hua, Shuo; Liu, Yi-Mou; Lio, Giuseppe Emanuele; Zhang, Xiaojun; Wu, Jin-Hui; Artoni, M.; Rocca, G. C. La

doi:10.1103/physrevresearch.4.023113

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…Equations ( 7) and ( 8) allow us to analyze and control the diffraction behavior in the diffraction plane. The validity of this method has been verified through full-wave simulations using COMSOL in the previous work [37] conducted in a 1D scenario.…”

Section: Model and Equationsmentioning

confidence: 86%

“…By introducing certain symmetry into the scattering potential, significant higher-order scattering takes place and leads to asymmetric diffraction according to the second condition of Friedel's law. In our previous work [37], we employed a pure phase grating with an odd symmetric (antisymmetric) distribution of refractive index in space (n = n + δn, δn(−x) = −δn(x)) to achieve higher order scattering, resulting in one-dimensional asymmetric diffraction and enabling specific functions, including directional elimination, group elimination, and directional diffraction, whose considerable robustness against disorders in offset refractive indices is nearly up to 30%. Moreover, many researchers have successfully synthesized media with tunable refractive indices through various materials and methods [38,39], thereby allowing for the feasible fabrication of such gratings in experiments.…”

Section: Introductionmentioning

confidence: 99%

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Engineered asymmetric diffractions of diagonal-line odd-symmetric phase gratings

Hua,

Zhang,

Chen

et al. 2023

New J. Phys.

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A two-dimensional multi-element phase grating has been designed in terms of the offset refractiveindex to exhibit the spatially odd symmetry along one transparent diagonal line with an even numberof rectangular elements while leaving other elements in a unit cell opaque. This grating can be engineeredto attain a few intriguing phenomena of asymmetric diffraction, including the elimination of equallyspaced oblique diffraction lines, the elimination of alternately crossed oblique diffraction lines, andthe selection of equally spaced oblique diffraction lines. These phenomena of engineered asymmetricdiffraction are well explained via destructive interference between transmitted field amplitudes frompaired, dual-paired, and successive elements along the transparent diagonal line.

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Section: Model and Equationsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Engineered asymmetric diffractions of diagonal-line odd-symmetric phase gratings

Hua,

Zhang,

Chen

et al. 2023

New J. Phys.

Self Cite

View full text Add to dashboard Cite

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Lopsided optical diffraction in a loop electromagnetically induced grating

Huo¹,

Hua²,

Tian³

et al. 2023

Opt. Express

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We propose a theoretical scheme in a cold rubidium-87 (87Rb) atomic ensemble with a non-Hermitian optical structure, in which a lopsided optical diffraction grating can be realized just with the combination of single spatially periodic modulation and loop-phase. Parity-time (PT) symmetric and parity-time antisymmetric (APT) modulation can be switched by adjusting different relative phases of the applied beams. Both PT symmetry and PT antisymmetry in our system are robust to the amplitudes of coupling fields, which allows optical response to be modulated precisely without symmetry breaking. Our scheme shows some nontrivial optical properties, such as lopsided diffraction, single-order diffraction, asymmetric Dammam-like diffraction, etc. Our work will benefit the development of versatile non-Hermitian/asymmetric optical devices.

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Tailored diffractions of asymmetric columns and symmetric rows in two-dimensional multi-element phase gratings

Hua¹,

Wu²

2023

Opt. Express

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Two-dimensional multi-element phase gratings can be engineered to show an even symmetry along one direction while an odd symmetry along the other direction in terms of offset refractive indices in each unit cell. The interplay of such even and odd symmetries has been explored to tailor diffraction columns and rows on demand by making offset refractive indices to satisfy specific requirements and hence attain different types of destructive interference. The resultant tailoring effects include the directional column elimination, the grouped column elimination, and the directional column selection as well as the natural row absence, the grouped row elimination, and the central row selection.

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Tailored diffraction asymmetries from spatially odd-symmetric phase gratings

Cited by 4 publications

References 42 publications

Engineered asymmetric diffractions of diagonal-line odd-symmetric phase gratings

Engineered asymmetric diffractions of diagonal-line odd-symmetric phase gratings

Lopsided optical diffraction in a loop electromagnetically induced grating

Tailored diffractions of asymmetric columns and symmetric rows in two-dimensional multi-element phase gratings

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