Kaiyu Cui

Tsinghua University

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i-10 index

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Co-Authors

Xue Feng

Tsinghua University

155

Fang Liu

Tsinghua University

119

Wei Zhang

Tsinghua University

Yidong Huang

Tsinghua University

Yidong Huang

Tsinghua University

Yidong Huang

Tsinghua University

Jianqiao Ye

Lancaster University

A Machowski

Sefako Makgatho Health Sciences University

Mariusz Maślak

Cracow University of Technology

Yongzhuo Li

Tsinghua University

Cooperative Institutions

Intelligent Health (United Kingdom)

214

Tsinghua University

178

Southwest Jiaotong University

159

Chinese Academy of Sciences

147

Shanghai Jiao Tong University

126

Nanjing University of Aeronautics and Astronautics

Tongji University

University of Chinese Academy of Sciences

Huazhong University of Science and Technology

Changsha University

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Polarization-controllably launching localized cosine-Gauss beam with spatially varied metallic nano-apertures

Optics Express (2019)

Xuesi Zhao Xue Feng Peng Zhao Fang Liu Kaiyu Cui

Two properly designed columns of orthogonally tilted and spatially varied nano-apertures have been demonstrated to achieve polarization-controlled launching of the localized cosine-Gauss beam, which is a kind of highly localized surface plasmonic wave without diffraction. According to the experimental results, the generated unidirectional propagating plasmonic beam could propagate with a non-diffracting length of up to 57μm as well as the extinction ratio of more than 150. We believe that our proposed device would play an important role in highly compact photonic circuit on-chip with plasmonic wave.

Extinction ratio

10.1364/oe.27.022053

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Citations (18)

Extending the Frequency Range of Surface Plasmon Polariton Mode with Meta-Material

Nano-Micro Letters (2016)

Fengyu Zhou Fang Liu Long Xiao Kaiyu Cui Xue Feng

The frequency range that surface plasmon polariton (SPP) mode exists is mainly limited by the metal material. With high permittivity dielectrics above metal surface, the SPP mode at high frequency has extremely large loss or can be cutoff, which limits the potential applications of SPP in the field of optical interconnection, active SPP devices and so on. To extend the frequency range of SPP mode, the surface mode guided by metal/dielectric multilayers meta-material has been studied based on the theory of electromagnetic field. It is demonstrated that surface mode not only could be supported by the meta-material but also extends the frequency to where conventional metal SPP cannot exist. Meanwhile, the characteristics of this surface mode, such as dispersion relation, frequency range, propagation loss and skin depth in meta-material and dielectrics, are also studied. It is indicated that, by varying the structure parameters, the meta-material guided SPP mode presents its advantages and flexibility over traditional metal one.

Cutoff frequency

10.1007/s40820-016-0110-8

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Citations (17)

Topologically Protected Quantum Logic Gates with Valley‐Hall Photonic Crystals

Advanced Materials (2024)

Lu He Dongning Liu Huizhen Zhang Furong Zhang Weixuan Zhang

Topological photonics provide a promising way to realize more robust optical devices against some defects and environmental perturbations. Quantum logic gates are fundamental units of quantum computers, which are widely used in future quantum information processing. Thus, constructing robust universal quantum logic gates is an important way forward to practical quantum computing. However, the most important problem to be solved is how to construct the quantum-logic-gate-required 2 × 2 beam splitter with topological protection. Here, the experimental realization of the topologically protected contradirectional coupler is reported, which can be employed to realize the quantum logic gates, including control-NOT and Hadamard gates, on the silicon photonic platform. These quantum gates not only have high experimental fidelities but also exhibit a certain degree of tolerances against certain types of defects. This work paves the way for the development of practical optical quantum computations and signal processing.

Quantum Logic

Quantum Turing machine

Quantum circuit

10.1002/adma.202311611

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Citations (4)

Two-Photon Process in Free Electron Radiation

Hongteng Lin Fang Liu Kaiyu Cui Xue Feng Wei Zhang

We propose and investigate analytically the new phenomenon of two-photon emission by free electrons. It’s found two-photon emission can be greatly enhanced by increasing transverse field of light in a specific photonic structure.

Free electron model

10.1364/cleo_at.2024.jw2a.185

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Spectral broadening effects of spontaneous emission and density of state on plasmonic enhancement in cermet waveguides

Optics Express (2013)

Keyong Chen Xue Feng Chao Zhang Kaiyu Cui Yidong Huang

Based on the full integration formula of Purcell factor (PF) deduced from Fermi's Golden Rule, the plasmonic enhancement in Au(1-α)S3N4(α) cermet waveguides is evaluated with the joint impact of finite emission linewidth and the broadening of PF spectrum. The calculation results indicate that the PF would be significantly degraded by the two broadening effects though the SPP resonance frequency can be tuned with different volume fractions (α) of Si3N4. It is also found that the critical emission linewidth is approximately linear to the PF spectrum linewidth. Thus in order to achieve strong plasmonic enhancement, both the emission and PF spectrum linewidths should be dramatically reduced.

Laser linewidth

10.1364/oe.21.000431

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Citations (3)

Dynamically sculpturing plasmonic vortices: from integer to fractional orbital angular momentum

Scientific Reports (2016)

Yu Wang Peng Zhao Xue Feng Yuntao Xu Fang Liu

Abstract As a fundamental tool for light-matter interactions, plasmonic vortex (PV) is extremely useful due to the unique near field property. However, it is a pity that, up to now, the orbital angular momentum (OAM) carried by PVs could not be dynamically and continuously tuned in practice as well as the properties of fractional PVs are still not well investigated. By comparing with two previously reported methods, it is suggested that our proposal of utilizing the propagation induced radial phase gradient of incident Laguerre-Gaussian (LG) beam is a promising candidate to sculpture PVs from integer to fractional OAM dynamically. Consequently, the preset OAM of PVs could have four composing parts: the incident spin and orbital angular momentum, the geometric contribution of chiral plasmonic structure, and the radial phase gradient dependent contribution. Moreover, an analytical expression for the fractional PV is derived as a linear superposition of infinite numbers of integer PVs described by Bessel function of the first kind. It is also shown that the actual mean OAM of a fractional PV would deviate from the preset value, which is similar with previous results for spatial fractional optical vortices.

Optical vortex

Azimuthal quantum number

10.1038/srep36269

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Citations (26)

Thermo-Optic Switch based on Double-Slot Photonic Crystal Waveguide

Conference on Lasers and Electro-Optics (2012)

Kaiyu Cui Qiang Zhao Xue Feng Yidong Huang Yongzhuo Li

Thermo-optic switch based on double-slot photonic crystal waveguide is demonstrated, high extinction ratio of 17 dB has been experimentally achieved under a switching power as low as 9.2 mW while the device is only 16-µm-long.

Extinction ratio

Waveguide

Integrated Optics

10.1364/cleo_at.2012.jw4a.84

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Microstructure Characteristics and Mechanical Properties of Flash Butt Welded 590 MPa V-N Microalloyed Heavy-Duty Truck Wheel Steel

Metals (2023)

Cairu Gao Kaiyu Cui Huifang Lan Tao Liu Linxiu Du

This study reports the welded joint of a novel 590 MPa V-N microalloyed wheel steel on microstructure and mechanical properties after flash butt welding. The welding parameters were flash current 48°/582.0 A, upsetting current 44°/516.6 A, and workpiece clearance 1.5 mm. The evolution of microstructure in the welded joint occurred as follows: welding seam (ferrite side plate + acicular ferrite +martensite)→coarse-grained zone (acicular ferrite + granular bainite)→fine-grained zone (fine-grained ferrite + M/A island)→base metal (equiaxed ferrite + pearlite). The standard impact energy value of welding seam, coarse grain zone, fine grain zone, and base metal at −40 °C was 116, 128, 144, and 88 J, respectively. The mechanical property of the joint was excellent. The microstructure, the number of grain boundaries, and the dislocation density directly affected the strength and hardness of the joint. The increase of large angle grain boundaries and the decrease of effective grain size were beneficial to the improvement of toughness. The hot-rolled 590 MPa V-N microalloyed wheel steel had superior weldability.

Acicular ferrite

Flash welding

Equiaxed crystals

Weldability

Microalloyed steel

10.3390/met13040688

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Citations (1)

Deep‐learning based on‐chip rapid spectral imaging with high spatial resolution

Chip (2023)

Jiawei Yang Kaiyu Cui Yidong Huang Wei Zhang Xue Feng

Spectral imaging extends the concept of traditional color cameras to capture images across multiple spectral channels and has broad application prospects. Conventional spectral cameras based on scanning methods suffer from the drawbacks of low acquisition speed and large volume. On-chip computational spectral imaging based on metasurface filters provides a promising scheme for portable applications, but endures long computation time due to point-by-point iterative spectral reconstruction and mosaic effect in the reconstructed spectral images. In this study, on-chip rapid spectral imaging was demonstrated, which eliminated the mosaic effect in the spectral image by deep-learning-based spectral data cube reconstruction. The experimental results show that 4 orders of magnitude faster than the iterative spectral reconstruction were achieved, and the fidelity of the spectral reconstruction for the standard color plate was over 99% for a standard color board. In particular, video-rate spectral imaging was demonstrated for moving objects and outdoor driving scenes with good performance for recognizing metamerism, where the concolorous sky and white cars can be distinguished via their spectra, showing great potential for autonomous driving and other practical applications in the field of intelligent perception.

Full spectral imaging

Spectral envelope

Spectral resolution

10.1016/j.chip.2023.100045

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Citations (15)

SEISMIC COLLAPSE AND DEBRIS DISTRIBUTION OF STEEL FRAME STRUCTURES WITH INFILL WALLS

Qin Zeng Hideki Moriyama Takashi Yamaguchi Mitsuhiro Shigeishi Yue Xing

Urban buildings will collapse when subjected to extreme earthquake. Debris caused by collapse can block roads, hinder rescue and increase casualties. Therefore, predicting the collapsed debris scope makes sense for earthquake damage estimation and urban disaster reduction. To solve the problem of element disappearance in the finite element method, the animation simulation technology is introduced in this study. The complete collapse process of steel frame structures with infill walls characterized by different height-width ratios and length-width ratios is simulated, and the distribution of collapsed debris is analyzed. The results indicate that the proposed method can completely reproduce the collapse process and collapsed debris distribution of the steel frames. Besides, the contribution of infill walls significantly expands the collapsed debris scope. Last, considering the length-width ratios and height-width ratios of the buildings, a prediction method of collapsed debris blocked area of steel frame is proposed.

Infill

10.18057/icass2020.p.315

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Citations (0)