检索结果-内蒙古大学图书馆

Unlocking phonon dynamics at interfaces: Angle-resolved transmission, mode conversion, and thermal conductance engineering

引用

International Journal of Heat and Mass Transfer 2025年 250卷

作者： Quanjie Wang Cheng Shao Yucheng Xiong Shouhang Li Renzong Wang Jianshi Sun Yifan Liu Xiangjun Liu School of Mechanical Engineering Shandong Key Laboratory of CNC Machine Tool Functional Components Qilu University of Technology (Shandong Academy of Sciences) Jinan PR China Institute of Micro/Nano Electromechanical System and Integrated Circuit College of Mechanical Engineering State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University Shanghai PR China Thermal Science Research Center Shandong Institute of Advanced Technology Jinan PR China Institute of Micro/Nano Electromechanical System and Integrated Circuit College of Mechanical Engineering Donghua University Shanghai PR China Centre de Nanosciences et de Nanotechnologies CNRS Université Paris-Saclay 91120 Palaiseau France

Thermal transport across material interfaces is a critical factor in the thermal management and overall performance of integrated circuits (ICs). We investigate the angle- and mode-dependent phonon transmission across GaN/AlN interfaces, examining both smooth and rough morphologies. For smooth interface, phonon transmission is strongly influenced by the incident angle, with a critical angle (∼44.4°) limiting transverse mode transmission. Notably, longitudinal acoustic (LA) phonons exhibit anomalous behavior at high incident angles due to mode conversion, forming hybrid modes via coupling with optical phonons. At rough interface, diffuse scattering significantly alters transmission characteristics, enabling additional transport channels and enhancing transverse mode transmission. Frequency-dependent effects reveal a transition to complete diffuse scattering, with energy redistribution across acoustic and optical modes, highlighting acoustic-to-optical conversion. Our decomposition of transmission coefficients quantifies mode-specific contributions, revealing that mode conversion enhances the interfacial thermal conductance (ITC) by ∼10 %. Additionally, we quantify the interface specularity parameter, identifying polarization- and wavelength-dependent deviations from the Ziman model. These findings provide insight into optimizing ITC through interface engineering and phonon dynamics.

关键词： Electric heating

来源：评论

学校读者我要写书评

暂无评论

Gm-APD lidar target scattering feature calculation and analysis based on radiometric calibration model

引用

Infrared Physics & technology 2025年 150卷

作者： Jiying Chang Kai Chen Jining Li Chao Yan Yuye Wang Kai Zhong Degang Xu Jianquan Yao Institute of Laser and Optoelectronics School of Precision Instruments and Optoelectronics Engineering Tianjin University Tianjin 300072 China Key Laboratory of Opto-electronic Information Technology (Ministry of Education) Tianjin University Tianjin 300072 China Key Laboratory of Micro Opto-electro Mechanical System Technology (Ministry of Education) Tianjin University Tianjin 300072 China Tiansun Laboratory China Aerospace Science and Industry Corporation Limited Beijing 102445 China Beijing Institute of Remote Sensing Equipment Beijing 100871 China

The analysis of target scattering characteristics is an important research field in target recognition and detection for single photon Lidar. The echo is significantly affected by the nonlinear response and probabilistic detection regimes, although the Geiger-mode avalanche photodiode (GM-APD) focal plane arrays improve the detection sensitivity to the single photon level. This work has established a radiometric calibration model, including theoretical calculation, experimental acquisition and system calibration. Then, two diffuse reflectance standard plates are used for calibration constant calculation and model validation. For the calibration plate and validation plate, the relative errors of the LRCS between theoretical calculation and experimental measurement are 6.91% and 13.99%, respectively. Subsequently, the variation of target feature parameters is analyzed based on the established radiometric calibration model. The results show that the standard deviation feature could be used as a target feature for denoising as well as target recognition.

关键词： Radiometry

来源：评论

学校读者我要写书评

暂无评论

Recent Advances in Monolithic Nonplanar Ring Oscillators

Recent Advances in Monolithic Nonplanar Ring Oscillators

引用

International Conference on Transparent Optical Networks

作者： Guoping Lin Yaqin Cao Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System School of Science Harbin Institute of Technology Shenzhen China MOE Key Laboratory of Fundamental Physical Quantities Measurement PGMF and School of Physics Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781728184234

ISBN: (纸本)9781728184241

Monolithic nonplanar ring oscillators are reliable narrow-linewidth continuous-wave laser sources in fundamental researches and practical applications, which have been successfully used in several satellite missions. In this talk, we report on recent developments on such laser sources. We show that high order Laguerre-Gaussian modes carrying orbital angular momentum can emit directly using a regular Gaussian pump beam. In particular, we demonstrate that these oscillators can work not only in the single-frequency lasing regime but also in the dual-frequency lasing regime with low phase noise performance.

关键词： Laser beams Laser modes Pump lasers Laser excitation Surface emitting lasers Laser noise

来源：评论

学校读者我要写书评

暂无评论

Effect of Mo doping on phase change performance of Sb2Te3

引用

Chinese Physics B 2021年第8期30卷 513-516页

作者：刘万良陈莹李涛宋志棠吴良才 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Micro-system and Information TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences College of Science Donghua University Magnetic Confinement Fusion Research Center Ministry of Education

Mo, as a dopant, is doped into Sb Te to improve its thermal stability. It is shown in this paper that the Mo-doped Sb2Te3(Mo0.26Sb2Te3, MST) material possesses phase change memory（PCM） applications. MST has better thermal stability than Sb2Te3（ST） and will crystallize only when the annealing temperature is higher than 250℃. With the good thermal stability,MST-based PCM cells have a fast crystallization time of 6 ns. Furthermore, endurance up to 4 × 105 cycles with a resistance ratio of more than one order of magnitude makes MST a promising candidate for PCM applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nanoscale Manipulation for The Fabrication of Field-emission Air-channel Transistors

Nanoscale Manipulation for The Fabrication of Field-emission...

引用

IEEE Conference on Nanotechnology

作者： Meng Liu Yu Lei Tie Li Yuelin Wang Science and Technology on Micro-system Laboratory Chinese Academy of Sciences Shanghai CHINA

A method based on nanoscale manipulation and focused ion beam etching is put forward for the fabrication of nanoscale field emission transistors with air channels. Using this method, the shape and size of the emitter is controllable with nanoscale precision. Material compatibility of the method is demonstrated with SiC, VO 2 , Ge and Cu. Low voltage field-emission behaviors and air-channel transistor characteristics are also demonstrated with an obvious forward-directional capability.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Diffusive nonreciprocity and thermal diode

引用

Physical Review B 2021年第1期103卷 014307-014307页

作者： Ying Li Jiaxin Li Minghong Qi Cheng-Wei Qiu Hongsheng Chen Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou 310027 China International Joint Innovation Center ZJU-UIUC Institute The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 China

Wave propagation and diffusion in linear materials preserve local reciprocity in terms of a symmetric Green's function. For wave propagations, the relation between the fields entering and leaving a system is more relevant than the detailed information about the fields inside it. In such cases, the global reciprocity of the scattering off a system through several ports is more important, which is defined as the symmetric transmission between the scattering channels. When a two-port system supports nonreciprocal (electromagnetic, acoustic) wave propagation, it is a (optical, phonon) diode directly following the definition. However, to date no concrete definition or discussion has been made on the global reciprocity of diffusive processes through a multiple-port system. It thus remains unclear what are the differences and relations between the three concepts, namely, local nonreciprocity, global nonreciprocity, and diode effect in diffusion. Here, we provide theoretical analysis on the frequency-domain Green's function and define the global reciprocity of heat diffusion through a two-port system, which has a different setup from that of a thermal diode. We further prove the equivalence between a heat transfer system with broken steady-state global reciprocity and a thermal diode, assuming no temperature-dependent heat generation. The validities of some typical mechanisms in breaking the diffusive reciprocity and making a thermal diode have been discussed. Our results set a general background for future studies on symmetric and asymmetric diffusive processes.

关键词： Diffusion Heat transfer Metamaterials Diodes Green's function methods

来源：评论

学校读者我要写书评

暂无评论

Visualizing Field-Effects and Chemical Passivation in Efficient 2D/3D Heterojunction Perovskite Solar Cells and Modules

SSRN

引用

SSRN 2023年

作者： Yang, Weichuang Ding, Bin Lin, Zedong Sun, Jingsong Meng, YuanYuan Sheng, Jiang Ding, Yong Yang, Zhenhai Ye, Jichun Dyson, Paul J. Nazeeruddin, Mohammad Khaja Ningbo China Sion Switzerland State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Guangdong Provincial Key Lab of Nano-Micro Materials Research School of Chemical Biology and Biotechnology Shenzhen Graduate School Peking University Shenzhen China School of Optoelectronic Science and Engineering Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou China University of Chinese Academy of Sciences Beijing China Zhejiang Energy Group R&D 152 Tianmushan Road Xihu District Hangzhou City310003 China

The full potential of perovskite solar cells (PSCs) is limited by charge-carrier recombination, due to the imperfect passivation methods. Here, interfacial recombination loss of field-effect and chemical passivation mechanisms is quantified. It was found that a favorable alignment of energy levels can provide very good field-effects to reduce minority carriers, and suppresses interfacial recombination losses more effectively than chemical passivation. To obtain high-efficiency PSCs, two-dimensional (2D) perovskites are promising candidates, which offer powerful field-effects and only require modest chemical passivation at the interface. Owing to promoted passivation and charge-carrier extraction, the power conversion efficiency of a 2D/3D heterojunction PSC was boosted to 25.32% (certified 25.04%) for small-size devices and to 21.48% for a large-area module (with a designated area of 29.0 cm2). Ion migration is also suppressed by the 2D/3D heterojunction so that the unencapsulated small-size devices maintain 90% of the initial efficiency after 2000 h of continuous operation at the maximum power point. © 2023, The Authors. All rights reserved.

关键词： Conversion efficiency

来源：评论

学校读者我要写书评

暂无评论

Transverse Patterns and Dual-Frequency Lasing in a Low-Noise Nonplanar-Ring Orbital-Angular-Momentum Oscillator

引用

Physical Review Applied 2020年第2期13卷 024067-024067页

作者： Yaqin Cao Ping Liu Cuifang Hou Yanne K. Chembo Zehuang Lu Guoping Lin MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Institute for Research in Electronics and Applied Physics (IREAP) and Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System School of Science Harbin Institute of Technology Shenzhen 518055 China

Monolithic optical cavities employing total internal reflections are appealing compact platforms for a wide range of applications from fundamental physics to industry applications. We characterize the transverse patterns of a millimeter-size monolithic nonplanar ring vortex laser pumped by a Gaussian beam. Vortex beams carrying orbital angular momentum (OAM) up to 30 together with vortex crystals and petal patterns are observed. The rigid nature of the monolithic cavity brings along its low-noise lasing performance for these beams. A frequency noise floor as low as 0.1Hz/Hz1/2 corresponding to sub-Hz instantaneous linewidth is measured. Furthermore, we demonstrate low-noise dual-frequency lasing with phase noise as low as −118dBc/Hz at 10-kHz offset for the beatnote at 8.2 GHz. We expect that such versatile and compact OAM laser sources can facilitate multiple applications including optical communications, optical tweezers, and laser metrology such as dual-frequency Doppler lidar.

关键词： Angular momentum of light Optical quantum information processing Optical sources & detectors Optical vortices Photonics Solid state lasers Spatial profiles of optical beams Cavity resonators

来源：评论

学校读者我要写书评

暂无评论

Wafer-level and highly controllable fabricated silicon nanowire transistor arrays on （111） silicon-on-insulator （SOl） wafers for highly sensitive detection in liquid and gaseous environments

引用

Nano Research 2018年第3期11卷 1520-1529页

作者： Xun Yang Anran Gao Yuelin Wang Tie Li Science and Technology on Micro-system Laboratory Shanghai Institute of Microsystem and Information Technology ChineseAcademy of Sciences Shanghai200050 China University of Chinese Academy of Sciences (UCAS) Beijing 100190 China

This paper presents a wafer-level and highly controllable fabrication technology for silicon nanowire field-effect transistor （SiNW-FET arrays） on （111） silicon- on-insulator （SOI） wafers. Herein, 3,000 SiNW FET array devices were designed and fabricated on 4-inch wafers with a rate of fine variety of more than 90% and a dimension deviation of the SiNWs of less than ＋ 20 nm in each array. As such, wafer-level and highly controllable fabricated SiNW FET arrays were realized. These arrays showed excellent electrical properties and highly sensitive determination of pH values and nitrogen dioxide. The high-performance of the SiNW FET array devices in liquid and gaseous environments can enable the detection under a wide range of conditions. This fabrication technology can lay the foundation for the large-scale application of SiNWs.

关键词： silicon nanowire array top-down wafer-leveLhigh-controllable high-performance

来源：评论

学校读者我要写书评

暂无评论

Comprehensive Analysis of Secure Data Aggregation Scheme for Industrial Wireless Sensor Network

引用

Computers, Materials & Continua 2019年第8期61卷 583-599页

作者： Weidong Fang Wuxiong Zhang QianQian Zhao Xiaohong Ji Wei Chen Biruk Assefa Key Laboratory of Wireless Sensor Network&Communication Shanghai Institute of Micro-system and Information TechnologyChinese Academy of SciencesShanghai201899China Shanghai Research Center for Wireless Communication Shanghai201210China College of Physics and Electronic Information Engineering Qinghai University for NationalitiesXining810007China School of Computer Science and Technology China University of Mining and TechnologyXuzhou221116China Infromation Communication Technology Department Wollo UniversityDessie EthiopiaEthiopia

As an Industrial Wireless Sensor Network(IWSN)is usually deployed in a harsh or unattended environment,the privacy security of data aggregation is facing more and more ***,the data aggregation protocols mainly focus on improving the efficiency of data transmitting and aggregating,alternately,the aim at enhancing the security of *** performances of the secure data aggregation protocols are the trade-off of several metrics,which involves the transmission/fusion,the energy efficiency and the security in Wireless Sensor Network(WSN).Unfortunately,there is no paper in systematic analysis about the performance of the secure data aggregation protocols whether in IWSN or in *** consideration of IWSN,we firstly review the security requirements and techniques in WSN data aggregation in this ***,we give a holistic overview of the classical secure data aggregation protocols,which are divided into three categories:hop-by-hop encrypted data aggregation,end-to-end encrypted data aggregation and unencrypted secure data *** this way,combining with the characteristics of industrial applications,we analyze the pros and cons of the existing security schemes in each category qualitatively,and realize that the security and the energy efficiency are suitable for ***,we make the conclusion about the techniques and approach in these categories,and highlight the future research directions of privacy preserving data aggregation in IWSN.

关键词： Industrial wireless sensor network wireless sensor network cyber security secure data aggregation protocol

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：