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Photonic graphene with reconfigurable geometric structures in coherent atomic ensembles

Frontiers of physics 2023年第5期18卷 217-225页

作者： Fuqiang Niu Hengfei Zhang Jinpeng Yuan Liantuan Xiao Suotang Jia Lirong Wang State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Photonic graphene,possesses a honeycomb-like geometric structure,provides a superior platform for simulating photonic bandgap,Dirac physics,and topological photonics.Here,the photonic graphene with reconfigurable geometric structures is demonstrated in a 5S_(1/2)–5P_(3/2)–5D_(5/2) cascade-type 85Rb atomic ensembles.A strong hexagonal-coupling field,formed by the interference of three identical coupling beams,is responsible for optically inducing photonic graphene in atomic vapor.The incident weak probe beam experiences discrete diffraction,and the observed pattern at the output plane of vapor cell exhibits a clear hexagonal intensity distribution.The complete photonic graphene geometries from transversely stretched to longitudinally stretched are conveniently constructed by varying the spatial arrangement of three coupling beams,and the corresponding diffraction patterns are implemented theoretically and experimentally to map these distorted geometric structures.Moreover,the distribution of lattice sites intensity in photonic graphene is further dynamically adjusted by two-photon detuning and the coupling beams power.This work paves the way for further investigation of light transport and graphene dynamics.

关键词： atomic ensembles photonic graphene geometric structures discrete diffraction

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(AuAg)_(44)(SPhtBu)_(26) versus(AuAg)_(44)(SPhF_(2))_(30):Tailoring the geometric structures and Optical Properties of Nanocluster Analogues

Precision Chemistry

引用

Precision Chemistry 2023年第3期1卷 139-145页

作者： Jiaojiao Han Hao Li Honglei Shen Ying Xu Xuejuan Zou Xi Kang Manzhou Zhu Department of Chemistry and Centre for Atomic Engineering of Advanced Materials Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information Technology and Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized MaterialsAnhui UniversityHefeiAnhui 230601China

Monolayer-protected nanoclusters are ideal models for understanding the correlations between structures and properties of inorganic nanoparticles,especially for those molecules with identical sizes but comparable structures.Here,we controllably prepared and structurally determined a valence-neutral Au_(24+x)Ag_(20-x)(SPhtBu)_(26)(0structures.Besides,the strong π-π interaction in Au2_(4+x)Ag_(20-x)(SPhtBu)_(26) contributed to its enhanced photoluminescence intensity compared with Au_(12)Ag_(32)(SPhF_(2))_(30).The study,herein,extends the 44-metal-atom cluster family,thereby enabling us to better understand the correlations between their structures and properties at the atomic level.

关键词： metal nanoclusters alloy structural analogues geometric structures optical properties

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