Lu He

Prof. Lu He


Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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27 August 2019 in Optics Express
Verified
Journal Article
Closed access
PDF file
LHLu He
Lu He
XZXiangdong Zhang
Xiangdong Zhang
XZX. D. Zhang
X. D. Zhang
In this work, we report the design of topological filter and all-optical logic gates based on two-dimensional photonic crystals with robust edge states. All major logic gates, including OR, AND, NOT, NOR, XOR, XNOR, and NAND, are suitably designed by using the linear interference approach. Moreover, numerical simulations show that our designed all-optical logic devices can always work well even if significant disorders exist. It is expected that such robust and compact logic devices have potential applications in future photonic integrated circuits.

26 October 2020 in Optics Express
Verified
Journal Article
Closed access
LHLu He
Lu He
HJH. Y. Ji
H. Y. Ji
YWYujing Wang
Yujing Wang
XZXiangdong Zhang
Xiangdong Zhang
The beam splitters are essential optical components that are widely used in various optical instruments. The robustness of beam splitters is very necessary to all-optical networks. Here we report the design of the topologically protected beam splitter, whose splitting ratio can change flexibly to an arbitrary ratio, such as 50:50, 33:67, 25:75, based on the two-dimensional silicon photonic crystal slab. By using the 50:50 beam splitter, all major logic gates (OR, AND, NOT, XOR, NAND, XNOR, and NOR) are suitably designed with the linear interference approach. Additionally, these devices exhibit robustness even though some disorders exist. It is expected that these robust and compact devices are potentially applicable in optical computing and signal processing.

22 February 2024 in Nature Communications
Verified
Journal Article
Open access
PDF file
LHLei Huang
Lei Huang
LHLu He
Lu He
WZWeixuan Zhang
Weixuan Zhang
HZHuizhen Zhang
Huizhen Zhang
DLDongning Liu
Dongning Liu
XZXiangdong Zhang
Xiangdong Zhang
Topological photonics provides a new degree of freedom to robustly control electromagnetic fields. To date, most of established topological states in photonics have been employed in Euclidean space. Motivated by unique properties of hyperbolic lattices, which are regular tessellations in non-Euclidean space with a constant negative curvature, the boundary-dominated hyperbolic topological states have been proposed. However, limited by highly crowded boundary resonators and complicated site couplings, the hyperbolic topological insulator has only been experimentally constructed in electric circuits. How to achieve hyperbolic photonic topological insulators is still an open question. Here, we report the experimental realization of hyperbolic photonic topological insulators using coupled ring resonators on silicon chips. Boundary-dominated one-way edge states with pseudospin-dependent propagation directions have been observed. Furthermore, the robustness of edge states in hyperbolic photonic topological insulators is also verified. Our findings have potential applications in the field of designing high-efficient topological photonic devices with enhanced boundary responses.

23 May 2022 in Physical Review B
Verified
Journal Article
Closed access
PDF file
WZWeixuan Zhang
Weixuan Zhang
FDFengxiao Di
Fengxiao Di
HYHao Yuan
Hao Yuan
HWHaiteng Wang
Haiteng Wang
XZXingen Zheng
Xingen Zheng
XZXiangdong Zhang
Xiangdong Zhang
Non-Hermiticity greatly expands existing physical laws beyond the Hermitian framework, revealing various phenomena with unique properties. To date, most exotic non-Hermitian effects, such as exceptional points and non-Hermitian skin effects, have been discovered in single-particle systems. The interplay between non-Hermitian and particle interactions is expected to be a more fascinating but much less explored area. Here, we report an experimental simulation of a strongly correlated non-Hermitian few-body system and reveal a type of non-Hermitian skin state toward effective boundaries in Hilbert space induced by strong interactions. Such an interaction-induced non-Hermitian effect represents the aggregation of bosonic clusters with nonidentical occupations in the periodic lattice, and we call it the non-Hermitian aggregation effect. By mapping the eigenstates of three correlated bosons to modes of the designed three-dimensional electric circuit, the interaction-induced non-Hermitian aggregation effects in Hilbert space are verified by measuring the spatial impedance response. Our finding not only discloses a physical effect in the non-Hermitian system but also suggests a flexible platform to further investigate other non-Hermitian correlated phases in experiments.

14 January 2022 in ACS Photonics
Verified
Journal Article
Closed access
LHLu He
Lu He
FZFurong Zhang
Furong Zhang
HZHuizhen Zhang
Huizhen Zhang
LKLing-Jun Kong
Ling-Jun Kong
WZWeixuan Zhang
Weixuan Zhang
XZXiangdong Zhang
Xiangdong Zhang

25 April 2023 in Laser & Photonics Reviews
Verified
Journal Article
Closed access
FZFurong Zhang
Furong Zhang
LHLu He
Lu He
HZHuizhen Zhang
Huizhen Zhang
Lingjun KongLingjun Kong
Lingjun Kong
XXXingsheng Xu
Xingsheng Xu
XZXiangdong Zhang
Xiangdong Zhang