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Strong field enhancement and ultra-narrow linewidth based on the coupling of anapole/gap modes in silicon nanodimer-ring arrays

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Results in Physics 2024年 60卷

作者： Ju, Xiongwu Luo, Minghe Yang, Can Hu, Jinyong School of Physics and Optoelectronics Xiangtan University Xiangtan 411105 China Hunan Engineering Laboratory for Microelectronics Optoelectronics and System on a Chip Xiangtan University Xiangtan 411105 China

All-dielectric metamaterials have recently received significant attention in the field of nanophotonics, due to their negligible dissipative losses and strong polariton response compared with metallic metamaterials. However, simultaneously achieving an ultra-narrow resonance linewidth and a significant field enhancement in the all-dielectric metamaterials is still a great challenge, limiting their further practical application. In this work, a novel nanostructure composed of silicon ring and nanodimer arrays is theoretically proposed and numerically simulated. Through introducing the coupling between the anapole mode originating from the ring arrays and the gap mode deriving from the nanodimer arrays, the as-designed dielectric metamaterial manifests dual-band high-quality resonance characteristics with strong electric field enhancement reaching up to 300 times, an ultra-narrow linewidth as narrow as 0.35 nm, and a large Q-factor of 4223.43 synchronously. Benefiting from the exceptional optical spectral characteristics, the proposed dielectric nanodimer-ring metamaterial can work as a high-available refractive index sensor, whose sensitivity can reach 307.69 nm RIU⁻¹ with its figure of merit attaining 879.11 RIU⁻¹, efficiently distinguishing an index change of less than 0.01. This research opens up a promising path for achieving extremely narrow spectral linewidth and significant enhancement of the electric field, exhibiting immense possibilities in applications such as biochemical sensing, nonlinear optics, and surface enhanced spectroscopy. © 2024 The Authors

关键词： All-dielectric metamaterials Anapole mode Gap mode High Q-factor Refractive index sensor Strong field enhancement

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Janus graphene: A two-dimensional half-auxetic carbon allotrope with a nonchemical Janus configuration

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Physical Review B 2024年第12期109卷 L121402-L121402页

作者： Linfeng Yu Jianhua Xu Chen Shen Hongbin Zhang Xiong Zheng Huimin Wang Zhenzhen Qin Guangzhao Qin State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China Institute of Materials Science Technical University of Darmstadt Darmstadt 64287 Germany Hunan Key Laboratory for Micro-Nano Energy Materials and Device and School of Physics and Optoelectronics Xiangtan University Xiangtan 411105 Hunan China School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 China Greater Bay Area Institute for Innovation Hunan University Guangzhou 511300 Guangdong Province People's Republic of China

We propose a nonchemical intrinsic Janus configuration and identify it in a pure sp2 hybridized carbon monolayer, termed Janus graphene. The spontaneous unilateral growth of carbon atoms drives the nonchemical Janus configuration in Janus graphene, which is totally different from the chemical effect in common Janus materials such as MoSSe. A structure-independent half-auxetic behavior is mapped in Janus graphene, that the structure maintains expansion whether stretched or compressed, which lies in the key role of the pz orbital. With the unique half-auxeticity that emerged in the nonchemical Janus configuration, Janus graphene enriches the functional carbon family as a promising candidate for micro/nanoelectronic device applications.

关键词： Crystal structure Poisson ratio 2-dimensional systems Graphene Janus particles Semiconductors First-principles calculations

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Active formation of Friedrich-Wintgen bound states in the continuum in dielectric dimerized grating borophene heterostructure

arXiv

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arXiv 2024年

作者： Yan, Xiao-Fei Wang, Xin-Yang Lin, Qi Wang, Ling-Ling Liu, Gui-Dong School of Physics and Optoelectronics Xiangtan University Xiangtan411105 China Hunan Engineering Laboratory for Microelectronics Optoelectronics and System on a Chip Xiangtan University Xiangtan411105 China School of Electronic and Information Engineering Beihang University Beijing100191 China School of Physics and Electronics Hunan University Changsha410082 China

The Friedrich-Wintgen bound state in the continuum (FW BIC) provides a unique approach for achieving high quality factor (Q-factor) resonance, which has attracted wide attention and promoted the development of various applications. However, the FW BIC is usually considered as accident BIC resulting from the continuous parameters tuning, and a systematic approach to generate the FW BIC is still lacking. To address this, a method of actively forming FW BIC by matching the damping rate and resonance frequency of the coupling mode is proposed. As a proof-of-principle example, we propose a dielectric dimerized grating borophene heterostructure that generates a FW BIC near the commercially important communication wavelength. The coupling system comprises an electrically tunable borophene plasmon mode and a BIC supported by a dielectric dimer grating that can be attributed to the Brillouin zone folding. More interestingly, the BIC can be excited by the localized borophene plasmon (LBP) mode through near-field coupling as LBP mode can be considered as the dipole source. The interaction between them can further form the FW BIC, and support electromagnetically induced transparency (EIT)-like with maximum group index up to 2043, indicating its great potential for slow light applications. Our results provide a promising strategy and theoretical support for the generation of FW BIC in active plasmonic optical devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Slow light

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New embedded DDSCR structure with high holding voltage and high robustness for 12-V applications

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Chinese Physics B 2020年第10期29卷 550-555页

作者： Jie-Yu Li Yang Wang Dan-Dan Jia Wei-Peng Wei Peng Dong School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Hunan Engineering Laboratory for Microelectronics Optoelectronics and System on A ChipXiangtan 411105China SuperESD Microelectronics Technology CO. LTD.Changsha 410100China

A new dual directional silicon-controlled rectifier based electrostatic discharge (ESD) protection device suitable for 12-V applications is proposed in this paper. The proposed device (NPEMDDSCR) is based on the embedded DDSCR (EMDDSCR) structure, in which the P+ electrode and P+ injection are removed from the inner finger. Compared with the conventional modified DDSCR (MDDSCR), its high holding voltage meets the requirements for applications. Compared with the embedded DDSCR (EMDDSCR), it has good conduction uniformity. The MDDSCR, EMDDSCR, and NPEMDDSCR are fabricated with an identical width in a 0.5-μm CDMOS process. In order to verify and predict the characteristics of the proposed ESD protection device, a transmission line pulse (TLP) testing system and a two-dimensional device simulation platform are used in this work. The measurements demonstrate that the NPEMDDSCR provides improved reliability and higher area efficiency for 12 V or similar applications. The measurement results also show that the NPEMDDSCR provides higher robustness and better latch-up immunity capability.

关键词： DDSCR holding voltage failure current conduction uniformity

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Inverse Janus design of two-dimensional Rashba semiconductors

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Physical Review B 2023年第11期108卷 115130-115130页

作者： Qikun Tian Puxuan Li Jinghui Wei Ziyu Xing Guangzhao Qin Zhenzhen Qin International Laboratory for Quantum Functional Materials of Henan and School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 People's Republic of China National Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China

The search for optimal Rashba semiconductors with large Rashba constants, strong electric field responses, and potential thermoelectric properties is pivotal for spin field-effect transistors (SFETs) and Rashba thermoelectric devices. Herein, we employ first-principles calculations to explore the intrinsic Rashba spin splitting in a series of two-dimensional (2D) XYZ2 (X, Y=Si, Ge, Sn; X≠Y; Z=P, As, Sb, Bi) monolayers via unnatural inverse Janus structural design. Instead of common Janus-type Rashba systems, the SiSnSb2 and GeSnSb2 monolayers within inverse Janus structures are first predicted as ideal Rashba systems with isolated spin-splitting bands near the Fermi level, and the Rashba constants αR are calculated as 0.94 and 1.27eVÅ, respectively. More importantly, the Rashba effect in such SiSnSb2 and GeSnSb2 monolayers can be more efficiently modulated by the external electric field compared to the biaxial or uniaxial strain, especially with GeSnSb2 monolayer exhibiting a strong electric field response rate of 1.34eÅ2, leading to a short channel length, L=64nm. Additionally, owing to the inapplicability of work function and potential energy in assessing built-in electric field (Ein) in inverse Janus SiSnSb2 and GeSnSb2 structures, we further propose an effective method to characterize Ein through a view of fundamental charge transfer to approximately quantize the αR and its variation under an external electric field. Our work not only proposes the GeSnSb2 monolayer acting as a promising multifunctional material for potential applications in SFETs and Rashba thermoelectric devices but also inspires future research to introduce Rashba spin splitting in 2D materials through inverse Janus design.

关键词： Electronic structure Rashba coupling Spin-orbit coupling 2-dimensional systems Density functional calculations

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Wave-graphene: a full-auxetic carbon semiconductor with high flexibility and optical UV absorption

arXiv

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arXiv 2024年

作者： Yu, Linfeng Zhang, Yi Lin, Jianzhou Dong, Kexin Zheng, Xiong Qin, Zhenzhen Qin, Guangzhao State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China School of Physics and Microelectronics Zhengzhou University Zhengzhou450001 China Research Institute of Hunan University in Chongqing Chongqing401133 China Greater Bay Area Institute for Innovation Hunan University Guangdong Province Guangzhou511300 China

The abundant bonding possibilities of Carbon stimulate the design of numerous carbon allotropes, promising the foundation for exploring structure-functionality relationships. Herein, utilizing the space bending strategy, we successfully engineered a two-dimensional carbon allotrope with pure sp2 hybridization, named "Wave-graphene" from the unique wave-like ripple structure. The novel Wave-graphene exhibits full-auxetic behavior due to anisotropic mechanical response, possessing both negative and zero Poisson's ratios. The fundamental mechanism can be attributed to the fact that highly buckled out-of-plane structures lead to anisotropic responses of in-plane nonlinear interactions, which further lead to anisotropy of lattice vibrations. In addition, Wave-graphene is found having quasi-direct wide bandgap of 2.01 eV, the excellent optical transparency and the high flexibility. The successful design of Wave-graphene with excellent outstanding multifunctional properties shows that the utilization of space bending strategies can provide more degrees of freedom for designing novel materials, further enriching the carbon material family and supplementing its versatility. Copyright © 2024, The Authors. All rights reserved.

关键词： Graphene

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Highly Sensitive Temperature and Curvature Sensor Based on Seven-Core Fiber

SSRN

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SSRN 2023年

作者： Zhu, Xiaojun Liu, Wen Sun, Ang Pan, Yongquan Li, Shuai Cao, Juan Zhang, Guoan Yang, Yongjie Yang, Fenghe Wang, Chinhua Liang, Zhipeng Shi, Yuechun Wu, Wuming School of Information Science and Technology Nantong University Nantong226019 China Zhangjiang Laboratory Shanghai201210 China School of Optoelectronic Science and Engineering Soochow University Suzhou215006 China Yongjiang Laboratory Ningbo315202 China School of Physics and Microelectronics Hunan University Hunan Province 410082 China

A high sensitivity temperature and curvature micro-fiber Mach-Zehnder interferometer (MMZI) sensor is proposed and demonstrated. A peanut structure is fused by a section of seven-core fiber (SCF) and a section of single-mode fiber (SMF). Then the SCF is connected to another SMF and tapered. Finally, the composite structure with the tapered SCF and the SCF-SMF peanut structure is fabricated. The coupling efficiency can be significantly improved, and more high-order modes can be stimulated via the new sensor structure. The experimental results demonstrated that the maximum temperature sensitivity is 836.67 pm/0C in the range of 35 0C to 40 0C, which is the highest temperature sensitivity of the peanut-shaped MMZI sensor to the best of our knowledge. Furthermore, the sensor can be used for curvature measurement. When the curvature change from 0 nm/m-1 to 0.0522449 nm/m-1, the sensitivity can achieve 93.33664 nm/m-1. The proposed sensor not only provides a novel method to fabricate a high-sensitivity sensor by combining different types of fibers, but it also has a meaningful application prospect in the fields of biological detection and environmental monitoring. © 2023, The Authors. All rights reserved.

关键词： Single mode fibers

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Softened sp2−sp3 bonding network leads to strong anharmonicity and weak hydrodynamics in graphene+

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Physical Review B 2022年第12期106卷 125410-125410页

作者： Linfeng Yu Ailing Chen Xiaoxia Wang Huimin Wang Zhenzhen Qin Guangzhao Qin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China Hunan Key Laboratory for Micro-Nano Energy Materials & Device and School of Physics and Optoelectronics Xiangtan University Xiangtan 411105 Hunan China School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 China

Graphene+, a novel carbon monolayer with sp2−sp3 hybridization, was recently reported to exhibit unprecedented out-of-plane half-auxetic behavior and graphenelike Dirac properties [Yu et al., Cell Rep. Phys. Sci. 3, 100790 (2022)]. Herein, based on comprehensive state-of-the-art first-principles calculations, we reveal the significant effect of softened sp2−sp3 bonding on the lattice thermal transport in graphene+. At room temperature, the thermal conductivity (κ) of graphene+ is obtained as ∼170 W/mK, which is much lower than that of graphene (∼3170 W/mK). It is found that the softened sp2−sp3 bonding significantly suppresses the vibrations of acoustic phonons in graphene+, which leads to strong anharmonicity and weak phonon hydrodynamics. Thus, the large reduction in κ stems from the softened sp2−sp3 bonding network. Our study provides fundamental physical insights into the thermal transport properties of graphene+, which would provide prospective guidance for the promising application in the field of thermal management.

关键词： Thermal conductivity 2-dimensional systems Graphene First-principles calculations

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Next-generation machine vision systems incorporating two-dimensional materials: Progress and perspectives

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InfoMat 2022年第1期4卷 23-39页

作者： Peisong Wu Ting He He Zhu Yang Wang Qing Li Zhen Wang Xiao Fu Fang Wang Peng Wang Chongxin Shan Zhiyong Fan Lei Liao Peng Zhou Weida Hu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina University of Chinese Academy of Sciences BeijingChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghaiChina Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and EngineeringZhengzhou UniversityZhengzhouChina Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina School of Physics and Electronics Hunan UniversityChangshaChina

Machine vision systems(MVSs)are an important component of intelligent systems,such as autonomous vehicles and ***,with the continuous increase in data and new application scenarios,new requirements are put forward for the next generation of *** is an urgent need to find new material systems to complement the existing semiconductor technology based on thin-film materials,and new architectures must be explored to improve *** of their unique physical properties,two-dimensional(2D)materials have received extensive attention for use in MVSs,especially in biomimetic ones:the human visual system,which can process complex visual information with low power consumption,provides a model for next-generation *** review paper summarizes the progress and challenges of applying 2D material photodetectors in sense-memory-computational integration and biomimetic image sensors for machine vision.

关键词： in-sensor computing machine vision systems photodetectors two-dimensional materials

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非平衡压缩实现高灵敏度、线性响应协同的离电压力传感器

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Science Bulletin 2024年第14期69卷 2221-2230页

作者：杨静李志斌伍莹沈勇张明陈彬袁国江肖松华冯建松张旭唐毓蔚丁孙安陈晓龙王太宏 Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education Engineering Research Center of Advanced Semiconductor Technology and Application of Ministry of EducationChangsha Semiconductor Technology and Application Innovation Research InstituteCollege of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China School of Environmental and Chemical Engineering Yanshan UniversityQinhuangdao 066004China School of Integrated Circuits Nanjing UniversitySuzhou 215163China

Flexible pressure sensors with high sensitivity and linearity are highly desirable for robot sensing and human physiological signal ***,the current strategies for stabilizing axial microstructures(e.g.,micro-pyramids)are mainly susceptible to structural stiffening during compression,thereby limiting the realization of high sensitivity and ***,we report a bending-induced nonequilibrium compression process that effectively enhances the compressibility of microstructures,thereby crucially improving the efficiency of interfacial area growth of electric double layer(EDL).Based on this principle,we fabricate an iontronic flexible pressure sensor with vertical graphene(VG)array ***-high sensitivity(185.09 kPa^(-1))and linearity(R^(2)=0.9999)are realized over a wide pressure range(0.49 Pa–66.67 k Pa).It also exhibits remarkable mechanical stability during compression and *** sensor is successfully employed in a robotic gripping task to recognize the targets of different materials and shapes based on a multilayer perception(MLP)neural *** opens the door to realizing haptic sensing capabilities for robotic hands and prosthetic limbs.

关键词： Artificial mechanoreceptor Pressure sensor Vertical grapheme Ionic nanofiber Object recognition E-skin

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