Xinrong Xie

Zhejiang University

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Fei Gao

Zhejiang University

Yumeng Yang

Anhui Normal University

Hongsheng Chen

Zhejiang University

Yuanzhen Li

Zhejiang University

Er‐Ping Li

Zhejiang University

Zijian Zhang

ShanghaiTech University

Jiale Yuan

Zhejiang University

Jing Yang

Pennsylvania State University

Haoran Xue

Chinese University of Hong Kong

Han Cai

Zhejiang University

Cooperative Institutions

Zhejiang University

State Key Laboratory of Modern Optical Instruments

Jinhua Academy of Agricultural Sciences

Shaoxing University

Zhejiang University of Science and Technology

Chinese Academy of Sciences

Zhejiang University of Technology

University of Chinese Academy of Sciences

Zhejiang Lab

Zhejiang University-University of Edinburgh Institute

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Realization of all-band-flat photonic lattices_Datasets

Figshare (2024)

Jing Yang yz lee Yumeng Yang Xinrong Xie Zijian Zhang

This file contains the datasets presented in the paper titled "Realization of all-band-flat photonic lattices". There are two folders named " reflection" and "transmission". The first one contains the reflection spectrum detected on each site, which is the raw data for generating Fig. 2, Fig. 3, and Fig.S4. The second one contains the raw data for generating Fig.4 and Fig.S7.

Realization (probability)

10.6084/m9.figshare.25027172.v1

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Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States

Physical Review Letters (2023)

Yuanzhen Li Su Xu Zijian Zhang Yumeng Yang Xinrong Xie

Photonic topological states, providing light-manipulation approaches in robust manners, have attracted intense attention. Connecting photonic topological states with far-field degrees of freedom (d.o.f.) has given rise to fruitful phenomena. Recently emerged higher-order topological insulators (HOTIs), hosting boundary states two or more dimensions lower than those of bulk, offer new paradigms to localize or transport light topologically in extended dimensionalities. However, photonic HOTIs have not been related to d.o.f. of radiation fields yet. Here, we report the observation of polarization-orthogonal second-order topological corner states at different frequencies on a designer-plasmonic kagome metasurface in the far field. Such phenomenon stands on two mechanisms, i.e., projecting the far-field polarizations to the intrinsic parity d.o.f. of lattice modes and the parity splitting of the plasmonic corner states in spectra. We theoretically and numerically show that the parity splitting originates from the underlying interorbital coupling. Both near-field and far-field experiments verify the polarization-orthogonal nondegenerate second-order topological corner states. These results promise applications in robust optical single photon emitters and multiplexed photonic devices.

Parity (physics)

Topological insulator

10.1103/physrevlett.130.213603

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Citations (21)

Energy‐Efficient Integrated Photonic Topological Devices

Laser & Photonics Review (2024)

Zijian Zhang Dashuang Liao Yuanzhen Li Xinrong Xie Yumeng Yang

Abstract Topological photonics is revolutionizing the integrated electromagnetic devices, on account of the robust mode propagations immune to structural defects and sharp bends. Such robust modes have spawned attractive devices known as photonic topological waveguides (PTW), especially implemented on compact photonic‐crystal platforms. However, these exotic waveguides are challenging to be high‐efficiently interconnected with conventional integrated photonic devices. To tackle this challenge, a general energy‐efficient strategy for topological photonic structures is proposed. Such strategy is implemented onto three types of typical PTWs, which extract electromagnetic energy high efficiently from standard single‐mode rectangular waveguides. Moreover, the results of dual‐polarization valley PTW proves the polarization‐independence of their strategy. The measured near‐perfect excitation efficiencies are stable across the whole operational band of topological waveguides, thus verifying the frequency independence of this strategy. By utilizing this energy‐efficient strategy, an integrated topological high‐gain antenna, which achieves the peak directive gain of 20.25 dBi and half power beam width of 5.23° at 60 GHz, is realized. This strategy on energy‐efficient design is general to be applicable on other types of topological photonic platforms and paves the way for applications of topological electromagnetic devices.

10.1002/lpor.202400567

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Citations (1)

Radiative anti-parity-time plasmonics

Nature Communications (2022)

Yumeng Yang Xinrong Xie Yuanzhen Li Zijian Zhang Yiwei Peng

Space and guided electromagnetic waves, as widely known, are two crucial cornerstones in extensive wireless and integrated applications respectively. To harness the two cornerstones, radiative and integrated devices are usually developed in parallel based on the same physical principles. An emerging mechanism, i.e., anti-parity-time (APT) symmetry originated from non-Hermitian quantum mechanics, has led to fruitful phenomena in harnessing guided waves. However, it is still absent in harnessing space waves. Here, we propose a radiative plasmonic APT design to harness space waves, and experimentally demonstrate it with subwavelength designer-plasmonic structures. We observe two exotic phenomena unrealized previously. Rotating polarizations of incident space waves, we realize polarization-controlled APT phase transition. Tuning incidence angles, we observe multi-stage APT phase transition in higher-order APT systems, constructed by using the scalability of leaky-wave couplings. Our scheme shows promise in demonstrating novel APT physics, and constructing APT-symmetry-empowered radiative devices.

Parity (physics)

10.1038/s41467-022-35447-3

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Citations (20)

Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States

arXiv (Cornell University) (2021)

Yuanzhen Li Su Xu Zijian Zhang Yumeng Yang Xinrong Xie

Photonic topological states, providing light-manipulation approaches in robust manners, have attracted intense attention. Connecting photonic topological states with far-field degrees of freedom(DoFs) has given rise to fruitful phenomena. Recently emerged higher-order topological insulators (HOTIs), hosting boundary states two or more dimensions lower than those of bulk, offer new paradigms to localize/transport light topologically in extended dimensionalities. However, photonic HOTIs have not been related to DoFs of radiation fields yet. Here, we report the observation of polarization-orthogonal second-order topological corner states at different frequencies on a designer-plasmonic Kagome metasurface in the far field.Such phenomenon stands on two mechanisms, i.e., projecting the far-field polarizations to the intrinsic parity DoFs of lattice modes and the parity splitting of the plasmonic corner states in spectra. We theoretically and numerically show that the parity splitting originates from the underlying inter-orbital coupling. Both near-field and far-field experiments verify the polarization-orthogonal nondegeneratesecond-order topological corner states. These results promise applications in robust optical single photon emitters and multiplexed photonic devices.

Topological insulator

Parity (physics)

10.48550/arxiv.2110.05703

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Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure

New Journal of Physics (2022)

Chi Wang Zijian Zhang Youfei Zhang Xinrong Xie Yumeng Yang

Abstract Terahertz photoconductive antenna (PCA) is an important device for generating ultrabroadband terahertz radiations, being applicable in various scenarios. However, the metallic electrodes in PCAs, a pair of coplanar strip lines (CSL), always produce horizontal electrode modes in a broad THz band, thus resulting in low directivity in the vertical direction. Here, we introduce spoof surface plasmon polariton (SSPP) structures to suppress horizontal electrode modes in a broad band. The suppression principles are accounted to both the forbidden band of the fundamental SSPP mode and the orthogonality between source and higher-order SSPP modes. In the SSPP-modified PCA, we achieve around 2 dBi higher directivity in the vertical direction compared to a typical CSL PCA. Unlike the narrow bands inheriting from conventional metamaterial resonators, the relative operational band of the SSPP-modified PCA is as broad as 48%. This planar SSPP structure is compatible with the well-developed micro fabrication technologies. Thus, our scheme can be combined with the semiconductor material engineering and plasmonic nanoscale structures for further increasing THz output power.

Directivity

STRIPS

10.1088/1367-2630/ac8116

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Citations (11)

Harnessing Anti‐Parity‐Time Phase Transition in Coupled Topological Photonic Valley Waveguides

Advanced Functional Materials (2023)

Xinrong Xie Maoliang Wei Yumeng Yang Yuanzhen Li Kunhao Lei

Abstract Topological and non‐Hermitian physics provide powerful tools for manipulating light in different ways. Recently, intense studies have converged on the interplay between topology and non‐Hermiticity, and have produced fruitful results in various photonic settings. Currently, the realization of this interplay falls under the paradigm of enabling energy exchange between topological systems and the environment. Beyond this paradigm, it is revealed that a non‐Hermitian phenomenon, i.e., the anti‐parity‐time phase transition, naturally emerges from a Hermitian system realized by coupled topological valley waveguides. Such phase transition gives two exotic topological superstates in the spectral domain. By further combining the two phases with topological robustness, a photonic topological bi‐functional device is realized on a silicon‐on‐insulator platform at telecommunications frequencies. The results provide a new perspective on light manipulation and integrated device applications.

Topological insulator

Parity (physics)

Topological degeneracy

Realization (probability)

10.1002/adfm.202302197

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Citations (9)

Improving the Radiation Efficiency of Terahertz Photoconductive Antenna with Hierarchical Spoof Plasmonic Structures

Yulin Du Xinrong Xie Hongsheng Chen Fei Gao

Photoconductivity

Photomixing

10.1109/aces-china62474.2024.10699622

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Radiative Anti-Parity-Time Plasmonics_Datasets

Figshare (2022)

Yumeng Yang Xinrong Xie Yuanzhen Li Zijian Zhang Yiwei Peng

This file contains the datasets presented in the paper titled "Radiative Anti-Parity-Time Plasmonics".

Parity (physics)

10.6084/m9.figshare.21601923

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Non-Hermitian Dirac cones with valley-dependent lifetimes

Nature Communications (2025)

Xinrong Xie Fei Ma W. B. Rui Zhaozhen Dong Yulin Du

Abstract Relativistic quasiparticles emerging from band degeneracies in crystals play crucial roles in the transport and topological properties of materials and metamaterials. Quasiparticles are commonly described by Hermitian Hamiltonians, with non-Hermiticity usually considered detrimental. In this work, we show that such an assumption of Hermiticity can be lifted to bring quasiparticles into non-Hermitian regime. We propose a concrete lattice model containing two Dirac cones with valley-dependent lifetimes. The lifetime contrast enables an ultra-strong valley selection rule: only one valley can survive in the long-time limit regardless of the excitation, lattice shape and other details. This property leads to an effective parity anomaly with a single Dirac cone and offers a simple way to generate vortex states. Additionally, extending non-Hermitian features to boundaries generates valley kink states with valley-locked lifetimes, making them effectively unidirectional and more resistant against inter-valley scattering. All these phenomena are experimentally demonstrated in a non-Hermitian electric circuit lattice.

Lattice (music)

10.1038/s41467-025-56882-y

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