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Ferroelectric Enhancement in a TiN/Hf1-xZrxO2/W Device with Controlled Oxidation of the Bottom Electrode

ACS Applied Electronic materials 2024年第2期6卷 1078-1086页

作者： Chiniwar, Santosh P. Hsieh, Ya-Chen Shih, Ching-Hsiang Teng, Chih-Yu Yang, Jheng-Lin Hu, Chenming Lin, Bi-Hsuan Tang, Mau-Tsu Tseng, Yuan-Chieh Department of Material Science & Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan International College of Semiconductor Technology National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States National Synchrotron Radiation Research Center Hsinchu30076 Taiwan

Hf1-xZxO2 (HZO) is a promising ferroelectric (FE) material with CMOS compatibility, while the TiN/HZO/W metal-ferroelectric-metal structure provides balanced thermal expansion for stacking. In this study, we developed a 7 nm film of HZO with a FE polarization (2Pr) value of ∼43 μC/cm2 and cycling endurance of 108 by determining the appropriate oxidation state for a W bottom electrode deposited via atomic layer deposition with a relatively low annealing temperature of 400 °C. To visualize FE uniformity, we used X-ray absorption spectroscopy phase mapping to construct a two-dimensional map of the orthorhombic (O), tetragonal (T), and monoclinic (M) phases of the HZO film. Subsequent orientation- and chemical-state-resolved X-ray analysis revealed that the enhanced FE polarization performance can be attributed to the combined effects of interface strain and oxygen vacancies. Piezoelectric force microscopy verified the switching uniformity of the devices and revealed the electrical characteristics for use in device optimization. © 2024 The Authors. Published by American Chemical Society

关键词： X ray diffraction analysis

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Towards Autonomous Shooting Rover via Situation Aware Visual-Perception and Dynamic Action Execution

Towards Autonomous Shooting Rover via Situation Aware Visual...

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2024 IEEE/SICE International Symposium on System Integration, SII 2024

作者： Chikoti, Shreenaga Shubham Seelam, Yukkta Jain, Aditya Mehta, Nishi Watsa, Sidhartha Ranjan, Ayush Behera, L. Indian Institute of Technology Kanpur Department of Mathematics and Scientific Computing India Indian Institute of Technology Kanpur Department of Material Science and Engineering India Indian Institute of Technology Kanpur Department of Electrical Engineering India Indian Institute of Technology Kanpur Department of Computer Science and Engineering India Indian Institute of Technology Kanpur Department of Mechanical Engineering India

ISBN: (纸本)9798350312072

In this system paper, we present our approach to the DJI Robomaster AI Challenge, 2022 where our team ERA-IITK was ranked 3rd worldwide among 83 teams. We primarily focus on system hardware design and algorithmic components to achieve full autonomy. We first detail the hardware infrastructure, including intricate details on sensors and communication setup. Then we comprehensively describe our algorithmic pipeline and a state machine based on them to realize an autonomous system. Our major novelty is the high-speed and accurate visual perception module for target detection, and high-speed self-localization to maximize the likelihood of a target being shot. Our research endeavor in this paper can serve as a foundation for more complex systems and holds immense potential for various real-world applications. © 2024 IEEE.

关键词： Vision

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Efficient Acoustic-Optical Fiber Coupling with Wire Horn Structure

Efficient Acoustic-Optical Fiber Coupling with Wire Horn Str...

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Frontiers in Optics + Laser science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser science 2023

作者： Wang, Ruixuan Theis, Logan Homa, Daniel Wang, Anbo Pickrell, Gary Center for Photonics Technology The Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA United States Center for Photonics Technology Department of Material Science and Engineering Virginia Tech BlacksburgVA United States

This paper reports on a wire horn structure to enhance acoustic-optical fiber coupling. Compared with the conventional schemes, it was proved to enhance the ultrasonic wave peak-to-peak amplitude coupling efficiency b... 详细信息

ISBN: (纸本)9781957171296

关键词： Coupling efficiency Fiber Bragg gratings Fiber optic sensors Mode conversion Optical fibers Tunable lasers

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Efficient Acoustic-Optical Fiber Coupling with Wire Horn Structure

Efficient Acoustic-Optical Fiber Coupling with Wire Horn Str...

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2023 Laser Applications Conference, LAC 2023

关键词： Ultrasonic waves

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Multiscale Modelling of Curved Pixel Arrays 23

Multiscale Modelling of Curved Pixel Arrays

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23rd International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2023

作者： Bellotti, Enrico Glennon, John Zhu, Mike Kyrtsos, Alex Glasmann, Andreu Electrical and Computer Engineering Department Boston University 8 St Mary Street BostonMA United States Division of Material Science and Engineering Boston University 8 St Mary Street BostonMA United States

ISBN: (纸本)9798350314298

Large format infrared (IR) detector arrays that provide high image resolution over a wide field of view (WFOV), are of critical importance for both defense and civilian applications, for example surveillance, astronomy, and remote sensing. Reduction of pixel pitch has been aggressively pursued to increase the array format, and the pixel dimension is approaching a size comparable to the wavelength. While significant progress has been made to increase the resolution of IR focal plane arrays (FPA), a considerable effort is still required to design the optics needed to implement the camera. For applications where a WFOV is needed, the camera optics has to be designed to mitigate the optical aberrations that degrade illumination and resolution uniformity across the FPA. This is currently achieved by employing many optical elements to flatten the Petzval field curvature to match the footprint of the planar image sensor. As a result of the complex optics needed to achieve field flattening, and at the same time to minimize other aberrations, the size, weight, and cost of the entire camera increases considerably. © 2023 IEEE.

关键词： Aberrations

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Bubble-pen lithography:Fundamentals and applications

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Aggregate 2022年第4期3卷 85-100页

作者： Pavana Siddhartha Kollipara Ritvik Mahendra Jingang Li Yuebing Zheng Walker Department of Mechanical Engineering The University of Texas at AustinAustinTexasUSA Department of Electrical and Computer Engineering The University of Texas at AustinAustinTexasUSA Material Science and Engineering Program Texas Materials InstituteThe University of Texas at AustinAustinTexasUSA

Developing on-chip functional devices requires reliable fabrication methods with high resolution for miniaturization,desired components for enhanced performance,and high throughput for fast prototyping and mass ***,laser-based bubble-pen lithography(BPL)has been developed to enable sub-micron linewidths,in situ synthesis of custom materials,and on-demand patterning for various functional components and *** exploits Marangoni convection induced by a laser-controlled microbubble to attract,accumulate,and immobilize particles,ions,and molecules onto different *** years have witnessed tremendous progress in theory,engineering,and application of BPL,which motivated us to write this ***,an overview of experimental demonstrations and theoretical understandings of BPL is ***,we discuss the advantages of BPL and its diverse applications in quantum dot displays,biological and chemical sensing,clinical diagnosis,nanoalloy synthesis,and *** conclude this review with our perspective on the challenges and future directions of BPL.

关键词： additive manufacturing capillary flow lithography marangoni convection microbubbles sensing

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electrically Injected GeSn Laser Operating up to 135 K

Electrically Injected GeSn Laser Operating up to 135 K

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Acharya, Sudip Zhou, Yiyin Amoah, Sylvester Jha, Rajesh Kumar Du, Wei Li, Baohua Yu, Shui-Qing Material Science and Engineering University of Arkansas FayettevilleAR72701 United States Department of Electrical Engineering and Computer Science University of Arkansas FayettevilleAR72701 United States Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States Arktonics LLC 1339 South Pinnacle Drive FayettevilleAR72701 United States

ISBN: (纸本)9781957171395

We demonstrated electrically injected GeSn laser with the threshold of 800 A/cm2 at 77 K. The decreased threshold compared to previous results was achieved by reducing optical loss and improving the optical confinement. The peak power was measured as 1.25 mW/facet at 77 K. At 135 K, the emission peak is at 2656 nm. © Optica Publishing Group 2024 © 2024 The Author(s)

关键词： Laser beam effects

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Strong nonlinear optical processes with extraordinary polarization anisotropy in inversionsymmetry broken two-dimensional PdPSe

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Light(science & Applications) 2024年第8期13卷 1524-1533页

作者： Song Zhu Ruihuan Duan Xiaodong Xu Fangyuan Sun Wenduo Chen Fakun Wang Siyuan Li Ming Ye Xin Zhou Jinluo Cheng Yao Wu Houkun Liang Junichiro Kono Xingji Li Zheng Liu Qi Jie Wang School of Electrical and Electronic Engineering Nanyang Technological University639798 SingaporeSingapore School of Material Science and Engineering Nanyang Technological University639798 SingaporeSingapore CINTRA CNRS/NTU/THALES UMI 3288Research Techno PlazaNanyang Technological University637371 SingaporeSingapore School of Materials Science and Engineering Harbin Institute of Technology150001 HarbinChina Department of Chemistry National University of Singapore117543 SingaporeSingapore GPL Photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina School of Electronics and Information Engineering Sichuan University610064 ChengduSichuanChina School of Physical and Mathematical Sciences Nanyang Technological University637371 SingaporeSingapore Departments of Electrical and Computer Engineering Physics and Astronomyand Materials Science and NanoEngineeringRice UniversityHoustonTXUSA

Nonlinear optical activities,especially second harmonic generation(SHG),are key phenomena in inversion-symmetrybroken two-dimensional(2D)transition metal dichalcogenides(TMDCs).On the other hand,anisotropic nonlinear optical processes are important for unique applications in nano-nonlinear photonic devices with polarization functions,having become one of focused research topics in the field of nonlinear ***,the strong nonlinearity and strong optical anisotropy do not exist simultaneously in common 2D ***,we demonstrate strong secondorder and third-order susceptibilities of 64 pm/V and 6.2×10^(-19)m^(2)/V^(2),respectively,in the even-layer PdPSe,which has not been discovered in other common TMDCs(e.g.,MoS2).Strikingly,it also simultaneously exhibited strong SHG anisotropy with an anisotropic ratio of~45,which is the largest reported among all 2D materials to date,to the best of our *** addition,the SHG anisotropy ratio can be harnessed from 0.12 to 45(375 times)by varying the excitation wavelength due to the dispersion ofχ^(2)*** an illustrative example,we further demonstrate polarized SHG imaging for potential applications in crystal orientation identification and polarization-dependent spatial *** findings in 2D PdPSe are promising for nonlinear nanophotonic and optoelectronic applications.

关键词： materials anisotropy nonlinear

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Effect of film quality on Surface Plasmon Polaritons at a Lanthanum Nickelate and Barium Titanate interface

Effect of film quality on Surface Plasmon Polaritons at a La...

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Frontiers in Optics, FiO 2022

作者： Breedlove, Shayla Ruzycki, Nancy Yoon, Yong-Kyu Zmuda, Henry Electrical and Computer Engineering University of Florida GainesvilleFL32608 United States Material Science and Engineering University of Florida GainesvilleFL32608 United States

Results of 2D FDTD simulation on the Lanthanum Nickelate (LNO) and Barium Titanate (BTO) interface support surface plasmon polaritons (SPPs) at telecommunication wavelengths. The importance of smooth sol gel thin film...

ISBN: (纸本)9781557528209

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Discrimination of Temperature and Strain by Characterizing Two Femtosecond Laser-Written Coincident Sapphire Fiber Bragg Gratings for Harsh Environment Applications

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IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Mumtaz, Farhan Zhang, Bohong Dey, Koustav Smith, Jeffrey D. O'Malley, Ronald J. Huang, Jie Missouri University of Science and Technology Department of Electrical and Computer Engineering RollaMO65409 United States Missouri University of Science and Technology Department of Material Science and Engineering RollaMO65409 United States

In this study, two co-incident sapphire fiber Bragg gratings (SFBGs) were successfully inscribed utilizing a femtosecond (fs) laser to achieve a high fringe contrast interferogram. These two SFBGs employ a unique configuration, one parallel to the center axis, called p-SFBG, and the other forming an angle from the center-axis, called a-SFBG, allowing for simultaneous strain and temperature measurements with low crosstalk. As a proof of concept, p-SFBG and a-SFBG using line-by-line method are characterized, which are shorter in length (i.e., 1.5 mm), producing reflectivity of ~3 dB. This effort demonstrates the use of two coincident SFBGs forming an angle of 2.29° between them within an extremely highly multimode sapphire fiber. The p-SFBG exhibits superior strain sensitivity (1.8 pm/ μΕ) in contrast to the a-SFBG (0.4 pm/ μΕ). Their efficacy was evaluated under applied strains reaching up to 1000 μΕ . Both SFBGs underwent thorough characterization for long-term stability at elevated temperatures, enduring exposure at 1600 ◦C for 24 h. The novelty of the sensor lies in the fact that a-SFBG exhibits extremely low sensitivity compared to p-SFBG, which plays an important role in eliminating the crosstalk between co-incident SFBGs. This configuration addresses challenges related to temperature and strain crosstalk, facilitating simultaneous measurements via sensitivity matrix in harsh environmental conditions. This achievement represents a significant advancement in the field of optical sensing, paving new avenues for simultaneous temperature and strain measurement, particularly for applications in harsh environments. © 1963-2012 IEEE.

关键词： Sapphire

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