Jian Chen

Nanjing University

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Co-Authors

Peiheng Wu

Hefei University

226

Lin Kang

Nanjing University

185

Biaobing Jin

Purple Mountain Laboratories

108

Xuecou Tu

Nanjing University

107

Xiaoqing Jia

Hefei University

Labao Zhang

Nanjing University

Weiwei Xu

University of Science and Technology of China

Jingbo Wu

Purple Mountain Laboratories

Caihong Zhang

Purple Mountain Laboratories

Qingyuan Zhao

Nanjing University

Cooperative Institutions

Nanjing University

553

Chinese Academy of Sciences

249

Collaborative Innovation Center of Advanced Microstructures

171

University of Chinese Academy of Sciences

121

Zhejiang University

105

University of Science and Technology of China

North Carolina State University

Synthetic Biologics (United States)

Kookmin University

University of Electronic Science and Technology of China

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Bifocal dual reflector system for active terahertz imaging

Applied Optics (2018)

Deliang Zhou Liwei Hou Yi Yuan Yuanzhang Zang Xuecou Tu

This paper introduces a method for optimizing the terahertz (THz) imaging resolution in a specified field of view (FoV) for a scanning dual reflector system (Gregory or Cassegrain system) based on the theory of field curvature. The authors built a Gregory scanning system to verify the ability of this method. The operating frequency of the verification system is 220 GHz, the FoV at a specified distance of 8 m is approximately 50 cm * 100 cm, and the imaging resolution throughout the entire FoV is better than 3 cm. Experimental results show that the imaging resolution of the classical dual reflector system can be optimized, and the proposed verification system can realize active THz imaging of the human body.

Reflector (photography)

Cassegrain reflector

Field of view

10.1364/ao.57.003224

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Citations (10)

Design of a Superconducting Nanowire Single-Photon Detector With Dual-Broadband and High Detection Efficiency

IEEE photonics journal (2017)

Fan Zheng Ruiying Xu Yajun Chen Guanghao Zhu Biaobing Jin

In this paper, we propose a structure of a superconducting nanowire single-photon detector (SNSPD) with a composite cavity. Compared with the SNSPD in previous studies, our device exhibits a property of high efficiency and dual broadband. Based on the transmission line theory, the structure is abstractedly expressed as an equivalent circuit model and a design method is presented. Taking λ = 1310nm and λ = 1550nm as an example, the structural parameters are calculated and verified by commercial software FDTD Solutions. The simulation results show that peaks of the absorption curve appear at both wavelengths and peak values are all larger than 97.5%. The influence of the upper half cavity on the full width at half maximum (FWHM) of the absorption peak is discussed. Our works provide a reference for designing an SNSPD with different FWHM.

10.1109/jphot.2017.2731985

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Citations (8)

Meteorology and Atmospheric Physics (2002)

Xin‐Min Zeng M. Zhao Baoren Su Jianping Tang Yonghong Zheng

Predictability

10.1007/s007030200031

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Citations (10)

A Gd@C82 single-molecule electret

Nature Nanotechnology (2020)

Kangkang Zhang Cong Wang Minhao Zhang Zhanbin Bai Fang‐Fang Xie

Electret

Chemical polarity

10.1038/s41565-020-00778-z

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Citations (94)

An alternative method for inferring Pandy’s test using cerebrospinal fluid total protein

Practical Laboratory Medicine (2024)

Liu Dong Xiaoqing Wang Qianqian Xu Ruoshui Cao Xuan Deng

Pandy's test is used to assess the globulin level in cerebrospinal fluid (CSF). As a semi-quantitative manual method, the practicality and clinical value of Pandy's test has been challenged.

10.1016/j.plabm.2024.e00411

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An Efficient and Polarization-Sensitive Superconducting-Nanowire Single-Photon Detector With Coupled Asymmetric Split-Ring Resonator-Loaded Cavity

IEEE Transactions on Applied Superconductivity (2016)

Mengmeng Yang Fan Zheng Biaobing Jin Guanghao Zhu Lin Kang

A highly efficient single-photon detector with strong polarization sensitivity is an important device in the field of quantum communication. Here, we present the design of a kind of superconducting-nanowire single-photon detector (SNSPD), in which the superconducting nanowire is embedded in a resonant cavity covered by a metasurface made of a coupled asymmetric split-ring resonator (CASRR). When illuminated by an incident light with different polarizations, CASRR will show totally different optical responses, which is used to obtain high polarization contrast in SNSPDs. Our simulation results show that an NbN nanowire meander with a filling factor of 0.2 can achieve an absorption efficiency of 84.3% at a wavelength of 1550 nm, when the electric field of the incident light is parallel to the NbN nanowire. Moreover, the polarization extinction ratio, i.e., the ratio of absorption rates between cases, where the electric fields are parallel and perpendicular to the NbN nanowire, is 522. Comparing with the results reported before, our SNSPD design demonstrates a much better performance.

Extinction ratio

Biasing

10.1109/tasc.2016.2593541

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Citations (1)

PARAMETER DESIGN FOR SUPERCONDUCTING FLUX QUBIT CIRCUIT

Jian Chen

The superconducting qubits are the most comparative qubits nowadays.This article introduced a discussion about main parameters which can affect the performance of superconducting flux qubit circuit and an analysis of the relations between the potential energy function curve and the barrier height of superconducting quantum interference device(SQUID)and the number of energy levels included in the potential well.This article also gave the lithography rigid design for the fabrication of Al/Al2O3/Al tunnel junction using suspended mask structure and oblique evaporation.It will be a solid foundation for superconducting qubits fabrication.

Flux qubit

Superconducting tunnel junction

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Resonant exceptional points sensing in terahertz metasurfaces

Applied Physics Letters (2024)

Lei Wang Hang Liu Tong Li Da Tian Caihong Zhang

The phenomenon of simultaneous degeneracy of eigenvalues and eigenstates in non-Hermitian systems, known as exceptional points (EPs), renders systems in the vicinity of EP highly sensitive to perturbations in the environment. Recently, research works on terahertz metasurfaces primarily focused on finding the degenerate eigenvalue using the transmission matrix, known as the scattering EP, while neglecting exploration of another form of EP—the resonant EP. In this study, we numerically, theoretically, and experimentally investigate the resonant EP in terahertz metasurfaces, whose unit cell is composed of two unidentical length metal rods in a two-energy level non-Hermitian system. By altering two system parameters, we can manipulate the coupling between the two resonators, thereby directly realizing the singularity of complex frequency through only a single measurement. Furthermore, our simulations and measurements indicate a sensitivity of up to 9046 GHz/(RIU·mm), which underscores the high sensitivity characteristics of EP. Our approach not only contributes a fresh perspective on understanding EP in non-Hermitian terahertz metasurfaces but also proposes alternative methods for high-sensitivity terahertz sensing.

10.1063/5.0193106

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Citations (7)

Intrinsic Josephson Junctions in BiSrCaCuO-2212: Recent Progress

IEICE Transactions on Electronics (2002)

Huabing Wang Jian Chen Lixing You Peiheng Wu Tsutomu Yamashita

SUMMARY In this paper, we review the progress in BiSrCaCuO-2212 Intrinsic Josephson junctions (IJJs) bysummarizing our recent results in fabrication and high frequencyexperiments. Using a double-side fabrication process, a well defined number of intrinsic Josephson junctions in a well defined geometrycan be fabricated. The junctions in the stack are quite homogeneous, and the power distribution of external irradiation among the junctions is even. Shapiro steps are clearlyobserved up to 2.5 THz, and the general condition for the occurrence of Shapiro steps at frequency f is that it should be much greater than the plasma frequency fpl. Under certain conditions the Shapiro steps are zero-crossing, making some applications possible, such as quantum voltage standard etc.

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Analytical model for the potential barrier height in depleted channel formed by P-N junctions

Chinese Science Bulletin (Chinese Version) (2017)

Tong Xiao Qiao Jian-li Jian Chen Jianhong Yang

bipolar junction transistor, BJT)和场效应晶体管(field-effect transistor, FET)中得到了很大应用

10.1360/n972016-00806

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Citations (1)