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Chip-integrated van der Waals PN heterojunction photodetector with low dark current and high responsivity

Light(Science & Applications) 2022年第5期11卷 901-910页

作者： Ruijuan Tian xuetao gan Chen Li Xiaoqing Chen Siqi Hu Linpeng Gu Dries Van Thourhout Andres Castellanos-Gomez Zhipei Sun Jianlin Zhao Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi’anChina Photonics Research Group and Center for Nano and Biophotonics Ghent UniversityB-9000 GentBelgium Materials Science Factory Instituto de Ciencia de Materiales de Madrid(ICMM-CSIC)E-28049 MadridSpain Department of Electronics and Nanoengineering and QTF Centre of Excellence Aalto UniversityFI-02150 EspooFinland

Two-dimensional materials are attractive for constructing high-performance photonic chip-integrated photodetectors because of their remarkable electronic and optical properties and dangling-bond-free ***,the reported chip-integrated two-dimensional material photodetectors were mainly implemented with the configuration of metalsemiconductor-metal,suffering from high dark currents and low responsivities at high operation ***,we report a van der Waals PN heterojunction photodetector,composed of p-type black phosphorous and n-type molybdenum telluride,integrated on a silicon nitride *** built-in electric field of the PN heterojunction significantly suppresses the dark current and improves the *** a bias of 1 V pointing from n-type molybdenum telluride to p-type black phosphorous,the dark current is lower than 7 nA,which is more than two orders of magnitude lower than those reported in other waveguide-integrated black phosphorus *** intrinsic responsivity up to 577 mA W^(−1) is ***,the van der Waals PN heterojunction is tunable by the electrostatic doping to further engineer its rectification and improve the photodetection,enabling an increased responsivity of 709 mA W^(−1).Besides,the heterojunction photodetector exhibits a response bandwidth of~1.0 GHz and a uniform photodetection over a wide spectral range,as experimentally measured from 1500 to 1630 *** demonstrated chip-integrated van der Waals PN heterojunction photodetector with low dark current,high responsivity and fast response has great potentials to develop high-performance on-chip photodetectors for various photonic integrated circuits based on silicon,lithium niobate,polymer,etc.

关键词： heterojunction responsivity waveguide

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Solvent-free fabrication of broadband WS2 photodetectors on paper

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Opto-Electronic Advances 2023年第3期6卷 1-11页

作者： Wenliang Zhang Onur Çakıroğlu Abdullah Al-Enizi Ayman Nafady xuetao gan Xiaohua Ma Sruthi Kuriakose Yong Xie Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de Madrid(ICMM-CSIC)Madrid E-28049Spain Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710071China

Paper-based devices have attracted extensive attention due to the growing demand for disposable flexible ***,we integrate semiconducting devices on cellulose paper substrate through a simple abrasion technique that yields high-performance photodetectors.A solvent-free WS_(2) film deposited on paper favors an effective electron-hole separation and hampers *** as-prepared paper-based WS2 photodetectors exhibit a sensitive photoresponse over a wide spectral range spanning from ultraviolet(365 nm)to near-infrared(940 nm).Their responsivity value reaches up to~270 mA W^(−1) at 35 V under a power density of 35 mW cm^(−2).A high performance photodetector was achieved by controlling the environmental exposure as the ambient oxygen molecules were found to decrease the photoresponse and stability of the WS_(2) ***,we have built a spectrometer using such a paperbased WS_(2) device as the photodetecting component to illustrate its potential *** present work could promote the development of cost-effective disposable photodetection devices.

关键词： paper electronics photodetector van der Waals materials solvent-free deposition tungsten disulfide

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Graphene-supported manipulation of surface plasmon polaritons in metallic nanowaveguides

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Photonics Research 2017年第3期5卷 162-167页

作者： HUA LU xuetao gan DONG MAO JIANLIN ZHAO MOE Key Laboratory of Space Applied Physics and Chemistry and Shaanxi Key Laboratory of Optical Information TechnologySchool of ScienceNorthwestern Polytechnical University

We investigate the electrically controlled light propagation in the metal–dielectric–metal plasmonic waveguide with a sandwiched graphene monolayer. The theoretical and simulation results show that the propagation loss exhibits an obvious peak when the permittivity of graphene approaches an epsilon-near-zero point when adjusting the gate voltage on graphene. The analog of electromagnetically induced transparency(EIT) can be generated by introducing side-coupled stubs into the waveguide. Based on the EIT-like effect, the hybrid plasmonic waveguide with a length of only 1.5 μm can work as a modulator with an extinction ratio of ～15.8 d B, which is 2.3times larger than the case without the stubs. The active modulation of surface plasmon polariton propagation can be further improved by tuning the carrier mobility of graphene. The graphene-supported plasmonic waveguide system could find applications for the nanoscale manipulation of light and chip-integrated modulation.

关键词： of on in Graphene-supported manipulation of surface plasmon polaritons in metallic nanowaveguides EIT for

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Photovoltaic effects in reconfigurable heterostructured black phosphorus transistors

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Chinese Physics B 2018年第12期27卷 71-76页

作者： Siqi Hu Ruijuan Tian Xiaoguang Luo Rui Yin Yingchun Cheng Jianlin Zhao Xiaomu Wang xuetao gan MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of ScienceNorthwestern Polytechnical Univeristy Shannxi Institute of Flexible Electronics Northwestern Polytechnical University School of Electronic Science and Engineering Nanjing University

We demonstrate a reconfigurable black phosphorus electrical field transistor,which is van der Waals heterostructured with few-layer graphene and hexagonal boron nitride *** homojunctions could be realized by controlling both source–drain and top-gate *** the spatially resolved scanning photocurrent microscopy technique,photovoltaic photocurrents originated from the band-bending regions are observed,confirming nine different configurations for each set of fixed *** addition,as a phototransistor,high responsivity(～800 mA/W)and fast response speed(～230μs)are obtained from the *** reconfigurable van der Waals heterostructured transistors may offer a promising structure towards electrically tunable black phosphorus-based optoelectronic devices.

关键词： black phosphorus reconfigurable heterostructure photovoltaic effect photocurrent

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Soliton fiber laser mode locked with two types of film-based Bi2Te3 saturable absorbers

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Photonics Research 2015年第2期3卷 43-46页

作者： Dong Mao Biqiang Jiang xuetao gan Chaojie Ma Yu Chen Chujun Zhao Han Zhang Jianbang Zheng Jianlin Zhao Key Laboratory of Space Applied Physics and Chemistry Ministry of Education SZU-NUS Collaborative Innovation Centre for Optoelectronic Science&Technology College of Optoelectronic EngineeringShenzhen University

We propose a low-threshold soliton fiber laser passively mode locked with two different types of film-like saturable absorbers, one of which is fabricated by mixing Bi2Te3 with de-ionized water, as well as polyvinyl alcohol（PVA）, and then evaporating them in a Petri dish, and the other of which is prepared by directly dropping Bi2Te3 solution on the PVA film. Both Bi2Te3–PVA films exhibit outstanding features of low loss, high flexibility, and easy synthesis. By incorporating Bi2Te3–PVA films into fiber lasers, stable single-soliton emissions are obtained at a low pump power of 13 mW. Our results suggest that the Bi2Te3 can work as a promising mode locker for ultrafast lasers,while PVA is an excellent host for fabricating high-performance film-based saturable absorbers.

关键词： mode Soliton fiber laser mode locked with two types of film-based Bi2Te3 saturable absorbers Bi

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Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal

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Opto-Electronic Advances 2023年第9期6卷 59-68页

作者： Zhen Hao Biqiang Jiang Yuxin Ma Ruixuan Yi xuetao gan Jianlin Zhao Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China

The conversion-efficiency for second-harmonic(SH)in optical fibers is significantly limited by extremely weak second-order nonlinearity of fused silica,and pulse pump lasers with high peak power are widely ***,we propose a simple strategy to efficiently realize the broadband and continuous wave(CW)pumped SH,by transferring a crystalline GaSe coating onto a microfiber with phase-matching *** the experiment,high efficiency up to 0.08%W-1mm-1 is reached for a C-band pump *** high enough efficiency not only guarantees SH at a single frequency pumped by a CW laser,but also multi-frequencies mixing supported by three CW light ***,broadband SH spectrum is also achieved under the pump of a superluminescent light-emitting diode source with a 79.3 nm *** proposed scheme provides a beneficial method to the enhancement of various nonlinear parameter processes,development of quasi-monochromatic or broadband CW light sources at new wavelength regions.

关键词： nonlinear optics second-harmonic generation continuous wave pump high efficiency multi-frequencies mixing broad spectra microfibers gallium selenide

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Magnetic plasmon resonances in nanostructured topological insulators for strongly enhanced light-MoS_(2) interactions

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Light(Science & Applications) 2020年第1期9卷 155-164页

作者： Hua Lu Zengji Yue Yangwu Li Yinan Zhang Mingwen Zhang Wei Zeng xuetao gan Dong Mao Fajun Xiao Ting Mei Weiyao Zhao Xiaolin Wang Min Gu Jianlin Zhao MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi’anChina Institute for Superconducting&Electronic Materials and ARC Centre of Excellence in Future Low-Energy Electronics University of WollongongNorth WollongongNSW 2500Australia Center for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and Technology200093 ShanghaiChina Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University510632 GuangzhouChina State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University710072 Xi’anChina

Magnetic resonances not only play crucial roles in artificial magnetic materials but also offer a promising way for light control and interaction with ***,magnetic resonance effects have attracted special attention in plasmonic systems for overcoming magnetic response saturation at high frequencies and realizing high-performance optical *** novel states of matter,topological insulators(TIs)present topologically protected conducting surfaces and insulating bulks in a broad optical range,providing new building blocks for ***,until now,high-frequency(*** range)magnetic resonances and related applications have not been demonstrated in TI ***,we report for the first time,to our knowledge,a kind of visible range magnetic plasmon resonances(MPRs)in TI structures composed of nanofabricated Sb_(2)Te_(3) *** experimental results show that the MPR response can be tailored by adjusting the nanogroove height,width,and pitch,which agrees well with the simulations and theoretical ***,we innovatively integrated monolayer MoS_(2) onto a TI nanostructure and observed strongly reinforced light-MoS_(2) interactions induced by a significant MPR-induced electric field enhancement,remarkable compared with TI-based electric plasmon resonances(EPRs).The MoS_(2) photoluminescence can be flexibly tuned by controlling the incident light *** results enrich TI optical physics and applications in highly efficient optical functionalities as well as artificial magnetic materials at high frequencies.

关键词： topological resonance visible

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Electrically induced dynamic Fano-like resonance in a graphene-coated fiber grating

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Photonics Research 2022年第5期10卷 1238-1243页

作者： BIQIANG JIANG XIAOMING ZHANG AILUN LI YUEGUO HOU ZHEN HAO xuetao gan JIANLIN ZHAO Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China

We created an all-fiber solution for fast,continuous,and controllable tuning of Fano-like *** embedding a graphene-coated fiber Bragg grating into one arm of a Mach—Zehnder interferometer,the narrow Bragg resonance interacts with a broad interference spectrum,forming a sharp asymmetric Fano-like resonance line *** the application of an electrical voltage over the graphene layer,the generated Joule heating shifts the Bragg resonance and consequently tunes the asymmetric Fano-like resonance line shape to a symmetric dip or electromagnetically induced transparency-like ***,by exploiting two modulated states with reversed Fano-like resonance line shapes,an optical switch can operate with an extinction ratio of 9 *** well-engineered Fano-like resonance in an all-fiber structure opens up new horizons for applications of fiber gratings in optical signal processing,slow-light lasing,and fiber sensing.

关键词： fiber interferometer tuning

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光学腔的共振线型

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光学学报 2021年第8期41卷 91-103页

作者：甘雪涛赵建林西北工业大学物理科学与技术学院陕西西安710129 西北工业大学陕西省光信息技术重点实验室陕西西安710129 西北工业大学光场调控与信息感知工业和信息化部重点实验室陕西西安710129

光学腔借助其特殊的共振线型,成为激光、精密检测、光传感、光开关等技术中尤为重要的光波器件。对已报道的光学腔中几种不同共振线型(洛伦兹型尖峰、洛伦兹型凹谷、不对称Fano型等)进行评述,并分析形成机制。最后,以硅基微环腔为例,提... 详细信息

光学腔借助其特殊的共振线型,成为激光、精密检测、光传感、光开关等技术中尤为重要的光波器件。对已报道的光学腔中几种不同共振线型(洛伦兹型尖峰、洛伦兹型凹谷、不对称Fano型等)进行评述,并分析形成机制。最后,以硅基微环腔为例,提出调控这些共振线型的方法和相关器件结构。

关键词：光学器件光学腔共振线型微环腔

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Selective excitation of a three-dimensionally oriented single plasmonic dipole

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Photonics Research 2019年第6期7卷 693-698页

作者： FAJUN XIAO GUANGLIN WANG xuetao gan WUYUN SHANG SHIYIN CAO WEIREN ZHU TING MEI MALIN PREMARATNE JIANLIN ZHAO MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi'an 710129 China Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC 3800 Australia

We experimentally demonstrate a scheme to deterministically excite a three-dimensionally oriented electric dipole in a single Au nanosphere by using a tightly focused radially polarized beam whose focal field possesses polarization states along three-dimensional(3D) orientations owing to the spatial overlap between longitudinal and radial electric field components. Experiment observations indicate that the orientation of an excited dipole moment gradually changes from out-of-plane to in-plane when the nanosphere is moved away from the beam center, which is reconfirmed by full-wave simulations. Moreover, rigorous calculation based on Mie theory reveals that a reduced effective ambient permittivity accompanies the rotation of the dipole moment, leading to a blue-shifted and narrowed resonance peak. We envision that our results could find applications in detecting the 3D orientation of isolated molecules and benefit the fine manipulation of light–matter interactions at the single-molecule level.

关键词： Selective excitation plasmonic dipole

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