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Niobium telluride absorber for a mode-locked vector soliton fiber laser

Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 130-138页

作者： XinXin Shang NanNan Xu Jia Guo Shuo Sun HuaNian Zhang swageh Ahmed AAl-Ghamdi Han Zhang DengWang Li Shandong Province Key Laboratory of Medical Physics and Image Processing Technology Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250014China Institute of Microscale Optoelectronics Collaborative Innovation Center for Optoelectronic Science&TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro-Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Niobium telluride(NbTe_(2)),an emerging transition metal dichalcogenide material,has been theoretically predicted to have nonlinear absorption properties and excellent optical ***,only a few studies of the utilization of NbTe_(2)in ultrafast photonics have been *** this work,a NbTe_(2)-based saturable absorber(SA)was applied in an erbium-doped fiber as a mode-locked device,and a vector soliton based on NbTe_(2)was obtained for the first ***_(2)-PVA film SA was successfully prepared by the liquid-phase exfoliation and spin coating methods,with a modulation depth of up to 10.87%.The nonlinear absorption coefficient of NbTe_(2)-based SA film tested through the open-aperture Z-scan laser measurement is 0.62×10^(−11) m/W.A conventional soliton with a pulse duration of 858 fs was generated using NbTe_(2)-based SA,which was demonstrated to be a kind of polarization-locked vector soliton in further *** experimental results reveal the nonlinear optical properties of NbTe_(2)and broaden its applications in ultrafast photonic devices.

关键词： niobium telluride saturable absorber mode-locked pulse fiber laser

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Interlayer sensitized van der Waals heterojunction photodetector with enhanced performance

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Nano Research 2023年第7期16卷 10537-10544页

作者： Huide Wang Yonghong Zeng FanXu Meng Rui Cao Yi Liu Zhinan Guo Tingting Wang Haiguo Hu Sidi Fan Yatao Yang swageh Omar AAl-Hartomy Abul Kalam Yonghong Shao Yu-Jia Zeng Dianyuan Fan Han Zhang International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Institute of Microscale OptoelectronicsInterdisciplinary Center of High Magnetic Field Physics of Shenzhen UniversityCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Guangzhou Key Laboratory of Sensing Materials and Devices Center for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Center of Characterization and Analysis Jilin Institute of Chemical TechnologyJilin 132022China School of Mathematical&Physical Sciences Wuhan Textile UniversityWuhan 430200China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia

Although photodetection based on two-dimensional(2D)van der Waals(vdWs)P-N heterojunction has attracted extensive attention recently,their low responsivity(R)due to the lack of carrier gain mechanism in reverse bias or zero bias operation hinders their applications in advanced photodetection ***,a black phosphorus/rhodamine 6G/molybdenum disulfide(BP/R6G/MoS_(2))photodiode with high responsivity at reverse bias or zero bias has been achieved by using interfacial charge transfer of R6G molecules assembled between heterojunction *** formed vdWs interface achieves high performance photoresponse by efficiently separating the additional photogenerated electrons and holes generated by R6G *** devices sensitized by the dye molecule R6G exhibit enhanced photodetection performance without sacrificing the photoresponse *** them,the R increased by 14.8-20.4 times,and the specific detectivity(D^(*))increased by 24.9-34.4 *** strategy based on interlayer assembly of dye molecules proposed here may pave a new way for realizing high-performance photodetection based on 2D vdWs heterojunctions with high responsivity and fast response speed.

关键词： heterojunction photodetector interlayer sensitization charge transfer responsivity

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CRISPR-Cas12a-Empowered Electrochemical Biosensor for Rapid and Ultrasensitive Detection of SARS-CoV-2 Delta Variant

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Nano-Micro Letters 2022年第10期14卷 83-94页

作者： Chenshuo Wu Zhi Chen Chaozhou Li Yabin Hao Yuxuan Tang Yuxuan Yuan Luxiao Chai Taojian Fan Jiangtian Yu Xiaopeng Ma Omar AAl-Hartomy swageh Abdullah GAl-Sehemi Zhiguang Luo Yaqing He Jingfeng Li Zhongjian Xie Han Zhang International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Shenzhen International Institute for Biomedical Research Shenzhen 518116People’s Republic of China Department of Respiratory Shenzhen Children’s HospitalShenzhen 518038People’s Republic of China Institute of Pediatrics Shenzhen Children’s HospitalShenzhen 518038People’s Republic of China Shenzhen Han’s Tech Limited Company Shenzhen 518000People’s Republic of China Hospital of Guangzhou Medical University Qingyuan city People’s HospitalQingyuan 511518People’s Republic of China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Zhongmin(Shenzhen)Intelligent Ecology Co. LtdShenzhen 518055People’s Republic of China Shenzhen Center for Disease Control and Prevention Shenzhen 518055People’s Republic of China

Coronavirus disease 2019(COVID-19)is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).The gold standard method for the diagnosis of SARS-CoV-2 depends on quantitative reverse transcription-polymerase chain reaction till now,which is time-consuming and requires expensive instrumentation,and the confirmation of variants relies on further sequencing ***,we first proposed a robust technique-methodology of electrochemical CRISPR sensing with the advantages of rapid,highly sensitivity and specificity for the detection of SARS-CoV-2 *** enhance the sensing capability,gold electrodes are uniformly decorated with electro-deposited gold *** DNA template identical to SARS-CoV-2 Delta spike gene sequence as model,our biosensor exhibits excellent analytical detection limit(50 fM)and high linearity(R2=0.987)over six orders of magnitude dynamic range from 100 fM to 10 nM without any nucleic-acid-amplification *** detection can be completed within 1 h with high stability and specificity which benefits from the CRISPR-Cas ***,based on the wireless micro-electrochemical platform,the proposed biosensor reveals promising application ability in point-of-care testing.

关键词： SARS-COV-2 variant Methodology of electrochemical CRISPR sensing(MOECS) Gold nanoparticles(AuNPs) Point-of-care testing(POCT)

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