Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones

Yu, Qingsong; Liu, Zhenzhi; Guo, De‐An; Liang, Shun; Zhang, Yanpeng; Zhang, Zhaoyang

doi:10.3390/nano12183222

Nanomaterials

2022

DOI: 10.3390/nano12183222

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Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones

Qingsong Yu

Zhenzhi Liu

De‐An Guo

et al.

Abstract: We demonstrate the transition of band structure from flatband to type-III Dirac cones in an electromagnetically induced Kagome photonic lattice generated in a three-level Λ-type 85Rb atomic configuration both experimentally and theoretically. Such instantaneously reconfigurable Kagome photonic lattice with flatband is “written” by a strong coupling field possessing a Kagome intensity distribution, which can modulate the refractive index of atomic vapors in a spatially periodical manner under electromagneticall… Show more

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Cited by 4 publications

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Reconfigurable Photonic Lattices Based on Atomic Coherence

Yuan,

Liang,

et al. 2024

Advanced Physics Research

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The array of coupled optical waveguides, which is also viewed as a photonic lattice, can exhibit abundant photonic band structures depending on the desired spatial arrangements of involved waveguides. Studies of photonic lattices are usually performed in solid‐state materials, where the required periodic susceptibilities can be achieved by employing the femtosecond laser direct‐writing or optical induction method, and have spawned flourishing achievements in manipulating the behaviors of light. Recently, the concept of electromagnetically induced photonic lattice (EIPL) is proposed under the well‐known electromagnetically induced transparency (EIT) in coherently prepared multilevel alkali‐metal atomic systems, where the strong coupling beams producing EIT possess spatially periodic intensity profiles. The inherited instantaneous tunability of susceptibility from EIT‐modulated atomic coherence allows for the easy reconfigurability of EIPLs, which gives rise to exotic beam dynamics under such a readily controllable framework. This paper summarizes the historical overview and recent advances of the in situ and all‐optically reconfigurable EIPLs. The Introduction section provides the scheme and formation of the EIPL via atomic coherence. The following sections review the recently demonstrated dynamical properties of light in various 1D and 2D EIPLs and in compound EIPLs built by two coupling fields. The final section gives brief concluding remarks.

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Reconfigurable Photonic Lattices Based on Atomic Coherence

Yuan,

Liang,

et al. 2024

Advanced Physics Research

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Optically induced reconfigurable Kagome photonic lattice assisted by a liquid crystal spatial light modulator

Liang¹,

Liu²,

Yu³

et al. 2023

J. Opt. Soc. Am. B

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A 2D Kagome photonic lattice possesses special band structures involving a flat band that allows the localization state and Dirac cones that show linear dispersion. Here, we report the construction of an instantaneously reconfigurable electromagnetically induced Kagome lattice in a Λ-type 85Rb atomic configuration theoretically and experimentally under the condition of electromagnetically induced transparency, which is excited by a weak Gaussian probe field and a strong coupling field with a Kagome intensity profile. The incident Gaussian probe field is discretely diffracted into a Kagome profile inside the atomic vapor cell with a spatially modulated susceptibility, which is induced by the structured coupling field generated by a liquid crystal spatial light modulator. We also explored the dynamical evolution of the probe field inside the Kagome photonic lattice by manipulating systematic parameters. This current work provides an alternative way to design instantaneously reconfigurable Kagome photonic lattices with a simplified experimental configuration. The instantaneous tunability may help to promote the discovery of underlying beam dynamics and the design of tunable devices relying on the properties of Kagome photonic structures.

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Geometric pattern evolution of photonic graphene in coherent atomic medium

et al. 2023

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The photonic graphene in atoms not only has the typical photonic band structures but also exhibits controllable optical properties that are difficult to achieve in the natural graphene. Here, the evolution process of discrete diffraction patterns of a photonic graphene, which is constructed through a three-beam interference, is demonstrated experimentally in a 5S1/2 − 5P3/2 − 5D5/2 85Rb atomic vapor. The input probe beam experiences a periodic refractive index modulation when traveling through the atomic vapor, and the evolution of output patterns with honeycomb, hybrid-hexagonal, and hexagonal geometric profiles is obtained by controlling the experimental parameters of two-photon detuning and the power of the coupling field. Moreover, the Talbot images of such three kinds of periodic structure patterns at different propagating planes are observed experimentally. This work provides an ideal platform to investigate manipulation the propagation of light in artificial photonic lattices with tunable periodically varying refractive index.

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Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones

Cited by 4 publications

References 52 publications

Reconfigurable Photonic Lattices Based on Atomic Coherence

Reconfigurable Photonic Lattices Based on Atomic Coherence

Optically induced reconfigurable Kagome photonic lattice assisted by a liquid crystal spatial light modulator

Geometric pattern evolution of photonic graphene in coherent atomic medium

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