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All-silicon low-loss THz temporal differentiator based on microring waveguide resonator platform

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Light(Advanced Manufacturing) 2024年第2期5卷 14-23页

作者： Yunjie Rui Shuyu Zhou xuecou tu Xu Yan Bingnan Yan Chen Zhang Ziyao Ye Huilin Zhang Jingya Xie Qing-Yuan Zhao La-Bao Zhang Xiao-Qing Jia Huabing Wang Lin Kang Jian Chen Peiheng Wu Research Institute of Superconductor Electronics(RISE) School of Electronic Science and EngineeringNanjing UniversityNanjingJiangsu 210023China Hefei National Laboratory Hefei 230088China Purple Mountain Laboratories NanjingJiangsu 211111China Terahertz Technology Innovation Research Institute Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai200093China

Microring resonators have been widely used in passive optical devices such as wavelength division multiplexers,differentiators,and *** on terahertz(THz)components has been accelerated by these photonics *** and integrated time-domain differentiators that enable low-loss,high-speed THz signal processing are necessary for THz *** this study,an on-chip THz temporal differentiator based on all-silicon photonic technology was *** device primarily consisted of a microring waveguide resonator and was packaged with standard waveguide *** performed time-domain differentiation on input signals at a frequency of 405.45 GHz with an insertion loss of 2.5 dB and a working bandwidth of 0.36 *** periodic waveforms could be handled by this *** device could work as an edge detector,which detected step-like edges in high-speed input signals through differential *** development holds significant promise for future THz data processing technologies and THz communication systems.

关键词： Silicon photonics Whispering gallery mode resonator THz silicon waveguide

Mid-infrared superconducting nanowire single photon detector enhanced by overcoupled metasurfaces

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Science Bulletin 2024年第17期69卷 2665-2669页

作者： Yue Dai Fengjie Zhu Kebin Fan Qi Chen Labao Zhang Fei Zhou Yue Fei Hang Yuan Hongkai Shi Hao Wang Xiaoqing Jia Qingyuan Zhao xuecou tu Lin Kang Jian Chen Biaobing Jin Peiheng Wu Research Institute of Superconductor Electronics&Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE Nanjing UniversityNanjing 210023China Hefei National Laboratory Hefei 230088China Purple Mountain Laboratories Nanjing 211111China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Superconducting nanowire single-photon detectors(SNSPDs)with low energy gaps exhibit superior single-photon sensitivity at infrared wavelengths[1],and state-of-the-art SNSPDs have the potential to meet the stringent demands of mid-IR(MIR)detection[2].However,the nanowire thickness(~λ/1000-λ/600)and width(~λ/166-λ/60)are much smaller than those at MIR wavelengths,which results in weak absorption with a low detection efficiency[3].

关键词： photon absorption infrared

tunable superconducting resonators via on-chip control of local magnetic field

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Chinese Physics B 2024年第5期33卷 674-679页

作者：王晨光岳文诚涂学凑迟天圆郭婷婷吕阳阳董思宁曹春海张蜡宝贾小氢孙国柱康琳陈健王永磊王华兵吴培亨 Research Institute of Superconductor Electronics School of Electronic Science and EngineeringNanjing UniversityNanjing 210023China Purple Mountain Laboratories Nanjing 211111China National Key Laboratory of Spintronics Nanjing UniversitySuzhou 215163China Hefei National Laboratory Hefei 230094China

Superconducting microwave resonators play a pivotal role in superconducting quantum *** ability to finetune their resonant frequencies provides enhanced control and ***,we introduce a frequency-tunable superconducting coplanar waveguide *** applying electrical currents through specifically designed ground wires,we achieve the generation and control of a localized magnetic field on the central line of the resonator,enabling continuous tuning of its resonant *** demonstrate a frequency tuning range of 54.85 MHz in a 6.21-GHz *** integrated and tunable resonator holds great potential as a dynamically tunable filter and as a key component of communication buses and memory elements in superconducting quantum computing.

关键词： superconducting resonator NbN kinetic inductance tunable resonator

Magnetic Nonreciprocity in a Hybrid Device of Asymmetric Artificial Spin-Ice-Superconductors

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Chinese Physics Letters 2024年第6期41卷 119-127页

作者：李冲黄培源王晨光李浩杰吕阳阳岳文诚袁子雄李甜雨涂学凑陶涛董思宁何亮贾小氢孙国柱康琳王华兵吴培亨王永磊 Research Institute of Superconductor Electronics Nanjing UniversityNanjing 210093China Purple Mountain Laboratories Nanjing 211111China National Key Laboratory of Spintronics Nanjing UniversitySuzhou 215163China

Controlling the size and distribution of potential barriers within a medium of interacting particles can unveil unique collective behaviors and innovative *** introduce a unique superconducting hybrid device using a novel artificial spin ice structure composed of asymmetric *** structure forms a distinctive superconducting pinning potential that steers unconventional motion of superconducting vortices,thereby inducing a magnetic nonreciprocal effect,in contrast to the electric nonreciprocal effect commonly observed in superconducting ***,the polarity of the magnetic nonreciprocity is in situ reversible through the tunable magnetic patterns of artificial spin *** findings demonstrate that artificial spin ice not only precisely modulates superconducting characteristics but also opens the door to novel functionalities,offering a groundbreaking paradigm for superconducting electronics.

关键词： artificial collective reciprocal

Fabrication of Al/AlO_x/Al Josephson junctions on silicon and sapphire substrates using a cold-development technique

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Science China(Physics,Mechanics & Astronomy) 2019年第6期62卷 75-80页

作者： Wei Chen JiaZheng Pan ZuYu Xu YangYang Lv XianJing Zhou xuecou tu Jun Li GuoZhu Sun HuaBing Wang Research Institute of Superconductor Electronics (RISE) Nanjing University

In order to obtain high-quality superconducting qubits, we employed a cold-development technique, using temperatures down to-20°C, to fabricate Al/AlOx/Al Josephson junctions. Cold development greatly reduced the sensitivity of the electron-beam resist to the developer, eliminated molecules of the electron-beam resist at trench edges, and improved the repeatability and reliability of the nanopatterning process. The fabricated samples have well-defined geometries and increased dose margins, with lateral sizes of 100 nm×100 nm on both silicon and sapphire substrates. Together with the bridge-free fabrication method we used in these experiments, we believe that the cold-development technique can play an important role in quantum information technology that employs superconducting qubits.

关键词： Josephson junction cold development electron-beam lithography insulating substrates

Terahertz narrow bandstop, broad bandpass filter using double-layer S-shaped metamaterials

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Science China(Information Sciences) 2013年第12期56卷 132-138页

作者： LIANG LanJu JIN BiaoBing WU JingBo ZHOU GaoChao ZHANG YongGang tu xuecou JIA Tao JIA XiaoQing CAO ChunHai KANG Lin XU WeiWei CHEN Jian College of Optoelectronics Engineering Zaozhuang University Research Institute of Superconductor Electronics (RISE) School of Electronic Science and EngineeringNanjing University

In this study,double-layer S-shaped metamaterials(MMs)are analyzed by terahertz time-domain *** materials exhibit narrow bandstop and broad bandpass transmission properties at both horizontal and vertical electric-feld polarizations.A 117%increase in the unloaded quality factor is experimentally observed for these *** center frequency is approximately 0.45 THz,with a 3-dB bandwidth of 0.52 THz from 0.20 to 0.72 THz at normal *** measured average insertion loss is 0.5 dB with a ripple of 1 *** results show that double-layer S-shaped MMs are efective in designing tunable terahertz devices.

关键词： metamaterial terahertz flter double-layer S-shaped material transmission

Wideband cryogenic amplifier for a superconducting nanowire single-photon detector

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Frontiers of Information Technology & Electronic Engineering 2021年第12期22卷 1666-1676页

作者： Lianming LI Long HE Xu WU Xiaokang NIU Chao WAN Lin KANG Xiaoqing JIA Labao ZHANG Qingyuan ZHAO xuecou tu National Mobile Communications Research Laboratory Department of Radio EngineeringSchool of Information Science and EngineeringSoutheast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China Research Institute of Superconductor Electronics School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

We present a low-power inductorless wideband differential cryogenic amplifier using a 0.13-μm Si Ge Bi CMOS process for a superconducting nanowire single-photon detector(SNSPD).With a shunt-shunt feedback and capacitive coupling structure,theoretical analysis and simulations were undertaken,highlighting the relationship of the amplifier gain with the tunable design parameters of the *** this way,the design and optimization flexibility can be increased,and a required gain can be achieved even without an accurate cryogenic device *** realize a flat terminal impedance over the frequency of interest,an RC shunt compensation structure was employed,improving the amplifier’s closed-loop stability and suppressing the amplifier *** S-parameters and transient performance were measured at room temperature(300 K)and cryogenic temperature(4.2 K).With good input and output matching,the measurement results showed that the amplifier achieved a 21-d B gain with a 3-d B bandwidth of 1.13 GHz at 300 *** 4.2 K,the gain of the amplifier can be tuned from 15 to 24 d B,achieving a 3-d B bandwidth spanning from 120 k Hz to 1.3 GHz and consuming only 3.1 m *** the chip pads,the amplifier chip core area was only about 0.073 mm^(2).

关键词： Cryogenic amplifier Wideband amplifier Superconducting nanowire single-photon detector(SNSPD)

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基于自制太赫兹检测器的快速成像系统

中国激光 2014年第8期41卷 246-249页

作者：孙振龙涂学凑姜奕康琳陈健吴培亨南京大学超导电子学研究所江苏南京210093 南京电子技术研究所江苏南京210039

利用直径为30cm卡塞格伦反射镜搭建了一套反射式太赫兹(THz)主动成像装置,并成功运用0.22THz的辐射源在室温下进行成像。分别使用自行制备的Nb5N6微测热辐射计THz常温检测器和商用VDI检测器进行成像并对结果进行了分析。成像的物体是5... 详细信息

利用直径为30cm卡塞格伦反射镜搭建了一套反射式太赫兹(THz)主动成像装置,并成功运用0.22THz的辐射源在室温下进行成像。分别使用自行制备的Nb5N6微测热辐射计THz常温检测器和商用VDI检测器进行成像并对结果进行了分析。成像的物体是5根并排排列的铜棒,铜棒直径为1.4cm,间距为5cm。改变参考频率,扫描速度,将成像时间从15s减少到7.5s。成像的范围约为20cm×6.5cm。两种检测器的成像分辨率达到1.41cm。

关键词：成像系统太赫兹卡塞格伦反射镜快速成像

Enhanced photon communication through Bayesian estimation with an SNSPD array

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Photonics Research 2020年第5期8卷 637-641页

作者： XIANG LI JINGROU TAN KAIMIN ZHENG LABAO ZHANG LIJIAN ZHANG WEIJI HE PENGWEI HUANG HAOCHEN LI BIAO ZHANG QI CHEN RUI GE SHUYA GUO TAO HUANG XIAOQING JIA QINGYUAN ZHAO xuecou tu LIN KANG JIAN CHEN PEIHENG WU School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China College of Engineering and Applied Sciences Nanjing UniversityNanjing 210023China Jiangsu Key Laboratory of Spectral Imaging and Intelligence Sense Nanjing University of Science and TechnologyNanjing 210094China

Laser communication using photons should consider not only the transmission environment’s effects,but also the performance of the single-photon detector used and the photon number *** communication based on the superconducting nanowire single-photon detector(SNSPD)is a new technology that addresses the current sensitivity limitations at the level of single photons in deep space *** communication’s bit error rate(BER)is limited by dark noise in the space environment and the photon number distribution with a traditional single-pixel SNSPD,which is unable to resolve the photon number *** this work,an enhanced photon communication method was proposed based on the photon number resolving function of four-pixel array SNSPDs.A simulated picture transmission was carried out,and the error rate in this counting mode can be reduced by 2 orders of magnitude when compared with classical optical ***,in the communication mode using photon-enhanced counting,the four-pixel response amplitude for counting was found to restrain the communication rate,and this counting mode is extremely dependent on the incident light intensity through experiments,which limits the sensitivity and speed of the SNSPD array’s performance ***,a BER theoretical calculation model for laser communication was presented using the Bayesian estimation algorithm in order to analyze the selection of counting methods for information acquisition under different light intensities and to make better use of the SNSPD array’s high sensitivity and speed and thus to obtain a lower *** counting method and theoretical model proposed in this work refer to array SNSPDs in the deep space field.

关键词： communication photon estimation