第 1 條，共 14 條
標題: Understanding homoepitaxial growth of horizontal kinked GaN nanowires
作者: Wu, ST (Wu, Shaoteng); Yi, XY (Yi, Xiaoyan); Tian, S (Tian, Shuang); Zhang, S (Zhang, Shuo); Liu, ZQ (Liu, Zhiqiang); Wang, LC (Wang, Liancheng); Wang, JX (Wang, Junxi); Li, JM (Li, Jinmin)
來源出版物: NANOTECHNOLOGY 卷: 32 期: 9 文獻號: 095606 DOI: 10.1088/1361-6528/abcc24 出版年: FEB 26 2021
摘要: Epitaxial horizontal nanowires (NWs) have attracted much attention due to their easily large-scale integration. From the reported literature, epitaxial growth is usually driven by minimization of strain between NW and substrate, which governs the growth along with specific crystallographic orientation. Here, we report the first homoepitaxial growth of horizontal GaN NWs from a surface-directed vapor-liquid-solid growth method. The NWs grow along with six symmetry-equivalent 1-100 (m-axis) directions, exhibiting a random 60 degrees/120 degrees kinked configuration. Owing to homoepitaxial growth, strain could be eliminated. From the obtained results, we suggest that the formation the horizontal NWs, and their growth direction /orientation is not directly related to the strain minimization. A general rule based on the epitaxial relationship and potential low-index growth orientation is proposed for understanding the arrangement of epitaxial horizontal NWs. It is deduced that kinking of the horizontal NWs was attributed to unintentional guided growth determined by the roughness of the substrates' surface. This study provides an insight for a better understanding of the evolution of epitaxial horizontal NWs, especially for the growth direction/orientation.
入藏號: WOS:000596724900001
PubMed ID: 33212433
作者識別號:
作者 Web of Science ResearcherID ORCID 號
Zhang, Shuo 0000-0002-7262-8847
ISSN: 0957-4484
eISSN: 1361-6528
第 2 條，共 14 條
標題: Ga composition effects on the electrical parameters of (Al,Ga)Sb/InAs two-dimensional electron gas
作者: Wei, QQ (Wei, Qiqi); Wang, HL (Wang, Hailong); Tong, SC (Tong, Shucheng); Ma, JL (Ma, Jialin); Zhao, XP (Zhao, Xupeng); Zhao, JH (Zhao, Jianhua)
來源出版物: SEMICONDUCTOR SCIENCE AND TECHNOLOGY 卷: 36 期: 2 文獻號: 025002 DOI: 10.1088/1361-6641/abcb1a 出版年: FEB 2021
摘要: The effects of Ga composition on the electrical parameters of (Al,Ga)Sb/InAs two-dimensional electron gas have been investigated. The (Al,Ga)Sb/InAs structures are grown on GaAs (001) substrate by molecular-beam epitaxy with various Ga compositions in Al1-xGaxSb bottom barrier. The sheet resistance shows a crossover with the variation of temperature, and the temperature T* corresponding to this crossover decreases with increasing the Ga composition. The temperature dependence of the electron mobility is similar for the samples with different Ga compositions, while the temperature dependence of the carrier density is obviously different. Qualitative analyses reveal that the temperature dependent portion of carrier density is mainly determined by the interface-related donors. A thermal activation model is used to fit the temperature dependence of carrier density, and the fitting results imply that the thermal activation energies of the carriers are significantly affected by the Ga composition. Our results provide useful information for understanding the sources of carriers in the (Al,Ga)Sb/InAs systems, and provide one pathway for the modulation of the temperature dependent carrier density.
入藏號: WOS:000595698600001
ISSN: 0268-1242
eISSN: 1361-6641
第 3 條，共 14 條
標題: A 77 GHz FMCW MIMO radar system based on 65nm CMOS cascadable 2T3R transceiver
作者: Ma, TK (Ma, Taikun); Chen, ZP (Chen, Zipeng); Wu, JX (Wu, Jianxi); Zheng, W (Zheng, Wei); Wang, SF (Wang, Shufu); Qi, N (Qi, Nan); Lin, M (Lin, Min); Chi, BY (Chi, Baoyong)
來源出版物: SCIENCE CHINA-INFORMATION SCIENCES 卷: 64 期: 1 文獻號: 114301 DOI: 10.1007/s11432-019-1511-5 出版年: 2021
入藏號: WOS:000591359700001
ISSN: 1674-733X
eISSN: 1869-1919
第 4 條，共 14 條
標題: Highly sensitive biosensor based on a microcantilever and alternating current electrothermal technology
作者: Wang, LH (Wang, Lihao); Fu, DY (Fu, Dengyuan); Liu, XC (Liu, Xiaochen); Zhao, JY (Zhao, Junyuan); Zhao, JC (Zhao, Jicong); Yuan, Q (Yuan, Quan); Zhu, YF (Zhu, Yinfang); Yang, JL (Yang, Jinling); Yang, FH (Yang, Fuhua)
來源出版物: JOURNAL OF MICROMECHANICS AND MICROENGINEERING 卷: 31 期: 1 文獻號: 015009 DOI: 10.1088/1361-6439/abcae6 出版年: JAN 2021
摘要: This work presents a highly sensitive biosensor based on a microcantilever and alternating current (AC) electrothermal technology. The AC electrothermal unit was developed and integrated with the cantilever chip to improve the capture efficiency of the molecules under test. The AC electrothermal effect enhanced the aggregation of molecules around the microcantilever, increased their binding probability to the sensor and improved the detection performance of the biosensor. This microcantilever sensor was used to detect Vibrio parahaemolyticus and achieved a detection limit of similar to 5 x 10(5) CFU ml(-1), one order of magnitude lower than that of the sensor without AC electrothermal technology. Meanwhile, the detection time was reduced to 40 min, nearly half that of the conventional cantilever sensors.
入藏號: WOS:000596718600001
ISSN: 0960-1317
eISSN: 1361-6439
第 5 條，共 14 條
標題: Watt-Level CW Ti: Sapphire Oscillator Directly Pumped With Green Laser Diodes Module (vol 32, pg 247, 2020)
作者: Miao, ZW (Miao, Zhang-Wang); Yu, HJ (Yu, Hai-Juan); Zhang, JY (Zhang, Jing-Yuan); Zou, SZ (Zou, Shu-Zhen); Zhao, PF (Zhao, Peng-Fei); Lou, BJ (Lou, Bo-Jie); Lin, XC (Lin, Xue-Chun)
來源出版物: IEEE PHOTONICS TECHNOLOGY LETTERS 卷: 32 期: 24 頁: 1543-1543 DOI: 10.1109/LPT.2020.3039751 出版年: DEC 15 2020
摘要: In the letter [1], the authors' affiliation were listed incorrectly. The correct affiliation is as follows:
入藏號: WOS:000597140400004
ISSN: 1041-1135
eISSN: 1941-0174
第 6 條，共 14 條
標題: Reconfigurable Photonic Microwave Mixer With Mixing Spurs Suppressed and Dispersion Immune for Radio-Over-Fiber System
作者: Lin, T (Lin, Tao); Zhang, ZK (Zhang, Zhike); Liu, JG (Liu, Jianguo); Zhao, SH (Zhao, Shanghong); Li, JY (Li, Jinye); Zou, CW (Zou, Canwen); Wang, JJ (Wang, Jiaojiao); Zhang, K (Zhang, Kun); Jiang, W (Jiang, Wei)
來源出版物: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 卷: 68 期: 12 頁: 5317-5327 DOI: 10.1109/TMTT.2020.3017225 出版年: DEC 2020
摘要: In this article, a reconfigurable mixer based on only one dual-polarization quadrature phase shift -keying modulator (DP-QPSKM) is proposed and comprehensively demonstrated for a radio-over-fiber (RoF) system. By changing the detection unit and adjusting the dc voltages, the single-ended, double-balanced, image (IM)-free, mixing spurs suppressed, and dispersion-immune mixing can be implemented. Experimental results show that the similar to 60-dB IM rejection ratio and the spur suppression ratio are achieved. Moreover, the dispersion-induced power fading is successfully compensated by the dc voltage adjustment. The spurious-free dynamic range (SFDR) is about 100.56 dB.Hz(2/3). Only one optical path is required without extra optical filters or phase-related devices, which makes the structure concise and stable. This structure would be more compact to meet the potential of integration if a dispersion medium with smaller size is available.
入藏號: WOS:000597191000033
作者識別號:
作者 Web of Science ResearcherID ORCID 號
zhang, zhi ke 0000-0002-8726-3174
ISSN: 0018-9480
eISSN: 1557-9670
第 7 條，共 14 條
標題: A Compact Multifrequency Measurement System Based on an Integrated Frequency-Scanning Generator (dagger)
作者: Shi, NN (Shi, Nuannuan); Hao, TF (Hao, Tengfei); Li, W (Li, Wei); Li, M (Li, Ming)
來源出版物: APPLIED SCIENCES-BASEL 卷: 10 期: 23 文獻號: 8571 DOI: 10.3390/app10238571 出版年: DEC 2020
摘要: A compact multifrequency measurement system based on frequency-to-time mapping technology is proposed and experimentally demonstrated using an integrated frequency scanning signal generator. The relationship between the input microwave frequency and the time difference of a pair of pulses is established to realize the frequency information mapping to the time information. As a main part in the proposed frequency measurement system, the frequency-scanning signal is generated by heterodyning of two lasers with the monolithic integrated laser array, of which one is modulated on a saw-tooth signal. In the proposed frequency measurement system, it can measure single/multiple frequency microwave signals with a large bandwidth for high resolution and flexible tunable measurement range for multifrequency band. In the experimental demonstration, the single frequency measurement errors are less than 90 MHz within the measurement range from 4 to 12 GHz. For two-tone signal, the measurement resolution reaches about 150 MHz.
入藏號: WOS:000597078900001
eISSN: 2076-3417
第 8 條，共 14 條
標題: Tunable spin-orbit torque switching in antiferromagnetically coupled CoFeB/Ta/CoFeB
作者: Zhang, RQ (Zhang, R. Q.); Shi, GY (Shi, G. Y.); Su, J (Su, J.); Shang, YX (Shang, Y. X.); Cai, JW (Cai, J. W.); Liao, LY (Liao, L. Y.); Pan, F (Pan, F.); Song, C (Song, C.)
來源出版物: APPLIED PHYSICS LETTERS 卷: 117 期: 21 文獻號: 212403 DOI: 10.1063/5.0031415 出版年: NOV 23 2020
摘要: We demonstrate a tunable spin-orbit torque (SOT) switching in an antiferromagnetically coupled CoFeB/Ta/CoFeB trilayer through careful design of magnetic anisotropies, where the thicker bottom CoFeB layer has a relatively weak perpendicular magnetic anisotropy (PMA) and PMA of the upper CoFeB layer is robust. The unique anisotropy feature causes a strong sensitivity to the assistant field during SOT switching, resulting in a slanted magnetic moment and a highly tunable switching window defined by the difference in Hall resistance between two SOT switching states at zero current. By further reducing the PMA of bottom CoFeB, only the upper layer can be switched by SOT. Until now, there are three types of SOT switching in antiferromagnetically coupled ferromagnetic metal/nonmagnetic metal/ferromagnetic metal trilayers: simultaneous switching between two antiparallel states with strong PMA for both ferromagnetic layers, field-free switching where one layer has in-plane magnetization and the other has canted out-of-plane magnetization, and tunable switching reported in this work. Our findings enrich the physical phenomena in trilayer SOT and may have potential application in multilevel storage and neural computing.
入藏號: WOS:000595783500002
ISSN: 0003-6951
eISSN: 1077-3118
第 9 條，共 14 條
標題: Ultra-compact low-loss variable-ratio 1x2 power splitter with ultra-low phase deviation based on asymmetric ladder-shaped multimode interference coupler
作者: Li, ZZ (Li, Zezheng); Huang, XR (Huang, Xingrui); Liu, Y (Liu, Yang); Kuang, YX (Kuang, Yingxin); Guan, H (Guan, Huan); Tian, LF (Tian, Lifei); Li, ZY (Li, Zhiyong); Han, WH (Han, Weihua)
來源出版物: OPTICS EXPRESS 卷: 28 期: 23 頁: 34137-34146 DOI: 10.1364/OE.405449 出版年: NOV 9 2020
摘要: We propose a novel optical 1x2 power splitter based on an asymmetric ladder-shaped multimode interference (MMI) coupler in silicon-on-insulator (SOI) which has an ultra-compact size of 3.3 mu mx2.4 mu m. A trapezoid with a small region is removed from the bottom left corner of the MMI coupler to achieve variable splitting ratio. The comparison with the asymmetric rectangular 1x2 splitter is numerically analyzed. By carefully optimizing the width of input taper, the proposed splitter shows a low phase deviation for the two output ports while keeping both of a low-loss performance and feasible splitting ratio. The simulated results show that the splitter can operate with an insertion loss less than 0.67 dB, a large range of splitting ratio from 50:50 to 11:89 and an ultra-low phase deviation less than 2.8 degrees among the C band spectra. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
入藏號: WOS:000589869600031
PubMed ID: 33182890
作者識別號:
作者 Web of Science ResearcherID ORCID 號
Li, Zezheng 0000-0003-1088-8667
Liu, Yang 0000-0002-8041-7062
Huang, Xingrui 0000-0003-0192-7193
ISSN: 1094-4087
第 10 條，共 14 條
標題: Fourth-harmonic-generation of 266-nm ultraviolet nanosecond laser with NaSr3Be3B3O9F4 crystal
作者: Chen, XD (Chen, Xudong); Liu, LJ (Liu, Lijuan); Wang, LR (Wang, Lirong); Zhang, L (Zhang, Ling); Wang, XY (Wang, Xiaoyang); Chen, ZY (Chen, Zhaoyang); Zhang, XW (Zhang, Xingwang)
來源出版物: OPTICAL ENGINEERING 卷: 59 期: 11 文獻號: 116110 DOI: 10.1117/1.OE.59.11.116110 出版年: NOV 2020
摘要: Ultraviolet (UV) 266-nm nanosecond (ns) laser was obtained through fourthharmonic-generation by using new nonlinear optical crystals of NaSr3Be3B3O9F4 (NSBBF) with different lengths. Since NSBBF crystals are prone to crack during laser experiments, we added a water-cooling device under NSBBF crystal in the experiment, and compared the experimental results under conditions of water cooling and no water cooling. Moreover, different laser focusing effects were explored to optimize the experimental conditions. The maximum optical conversion efficiency from 532 to 266 nm was 4.8% with the pump power of 2.8 W. The maximum average output power of the 266-nm UV laser was 420 mW when the 532-nm pump power was 23.82 W. The study provides research ideas and experimental basis for NSBBF crystal to realize higher-power 266-nm ns laser output. (C) 2020 Society of Photo Optical Instrumentation Engineers (SPIE)
入藏號: WOS:000597284800029
ISSN: 0091-3286
eISSN: 1560-2303
第 11 條，共 14 條
標題: Recognition of distorted QR codes with one missing position detection pattern
作者: Huang, JF (Huang, Jianfen); Li, LY (Li, Liyan); Wang, X (Wang, Xiao); Lu, BL (Lu, Baoli); Liu, YL (Liu, Yuliang)
來源出版物: IET IMAGE PROCESSING 卷: 14 期: 13 頁: 3154-3160 DOI: 10.1049/iet-ipr.2019.1095 出版年: NOV 2020
摘要: Quick response (QR) codes are widely used in many fields. Various QR code recognition approaches have been proposed to improve the accuracy of decoding QR code. However, the recognition of distorted QR codes with one missing position detection pattern (PDP) remains a problem. In this study, based on the vector relationship and the structural features, the authors introduce a new method for decoding distorted QR code with one missing PDP. Three methods, Zxing, Halcon, and the newly proposed method, are used to test the decoding capability. For QR codes with one missing PDP, the experimental results show that the proposed method could meet the recognition angle range as much as 110 degrees, while Zxing fails to recognise, and the angle of decoding for Halcon is 90 degrees. Especially, the proposed method is available at an extremely harsh luminance and contrast environment, e.g. both phases as a 60% discount, when the decoding angle of Halcon is only 35 degrees, while the proposed one better than 2.7 times of it. Besides, the proposed method is more robust to decode the QR codes with a missing PDP under different backgrounds and noisy images.
入藏號: WOS:000595800300023
ISSN: 1751-9659
eISSN: 1751-9667
第 12 條，共 14 條
標題: Polarization-Selective Bidirectional Absorption Based on a Bilayer Plasmonic Metasurface
作者: Li, T (Li, Tong); Chen, BQ (Chen, Bin-Quan); He, Q (He, Qian); Bian, LA (Bian, Li-An); Shang, XJ (Shang, Xiong-Jun); Song, GF (Song, Guo-Feng)
來源出版物: MATERIALS 卷: 13 期: 22 文獻號: 5298 DOI: 10.3390/ma13225298 出版年: NOV 2020
摘要: We propose an alignment-free and polarization-selective bidirectional absorber composed of a one-dimensional bilayer Au grating array buried in a silicon nitride spacer. The absorptivity of the designed structure is more than 95% (77%) under normal forward (backward) TM-polarized light incidence, and is more than 80% (70%) within a forward (backward) incident angle up to 30 degrees. The great bidirectional absorption performance is illustrated by the resonance coupling of the surface plasmon polaritons (SPPs) resonance, the propagating surface plasmon (PSP) resonance and the localized surface plasmon (LSP) resonance under TM-polarized wave illumination. Moreover, the excitation of the Fano-like resonance mode of the proposed metasurface can produce two significantly different peaks in the absorption spectrum under the oblique TM-polarized incidence, which is beneficial for the plasmon-sensing application. Therefore, the proposed bidirectional metasurface absorber can be a candidate in the application of optical camouflage, thermal radiation, solar cells and optical sensing.
入藏號: WOS:000594957800001
PubMed ID: 33238483
eISSN: 1996-1944
第 13 條，共 14 條
標題: Multistate Logic Inverter Based on Black Phosphorus/SnSeS Heterostructure (vol 5, 1800416, 2019)
作者: Lv, WX (Lv, Wenxing); Fu, X (Fu, Xia); Luo, X (Luo, Xin); Lv, WM (Lv, Weiming); Cai, JL (Cai, Jialin); Zhang, BS (Zhang, Baoshun); Wei, ZM (Wei, Zhongming); Liu, ZY (Liu, Zhongyuan); Zeng, ZM (Zeng, Zhongming)
來源出版物: ADVANCED ELECTRONIC MATERIALS 卷: 6 期: 11 文獻號: 2000879 DOI: 10.1002/aelm.202000879 出版年: NOV 2020
入藏號: WOS:000595447600019
ISSN: 2199-160X
第 14 條，共 14 條
標題: High Extinction Ratio Polarization Beam Splitter Realized by Separately Coupling
作者: Niu, CQ (Niu, Chaoqun); Liu, Z (Liu, Zhi); Li, XL (Li, Xiuli); Liu, XQ (Liu, Xiangquan); Wan, FS (Wan, Fengshuo); Zheng, J (Zheng, Jun); Cheng, BW (Cheng, Buwen); Xue, CL (Xue, Chunlai); Zuo, YH (Zuo, Yuhua)
來源出版物: IEEE PHOTONICS TECHNOLOGY LETTERS 卷: 32 期: 18 頁: 1183-1186 DOI: 10.1109/LPT.2020.3016028 出版年: SEP 15 2020
摘要: A novel compact polarization beam splitter (PBS) based on a triple-waveguide directional coupler is presented. Among these three waveguides, the middle one is regarded as an input where the contrast of effective refractive index between fundamental modes is enhanced with dielectric-loaded waveguide. Confined into the waveguides with coupling lengths of 8.3 mu m (TM) and 9.9 mu m (TE) on both sides, the two fundamental modes are separately coupled. In virtue of the separated coupling structure, a high polarization extinction ratio (PER) of 45.6 dB together with a low insertion loss (< 0.3 dB) for TE mode, and meanwhile a moderate PER of 20.0 dB with an insertion loss of (< 0.1 dB) for TM mode are achieved at around 1.55 mu m. Furthermore, the operation bandwidth of this PBS, during which the PER is higher than 40 dB, is up to 80 nm for TE mode.
入藏號: WOS:000595143900015
ISSN: 1041-1135
eISSN: 1941-0174