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IEEE 31st Conference on electrical Performance of Electronic Packaging and Systems (EPEPS)

作者： Akinwande, Oluwaseyi Bhatti, Osama Waqar Swaminathan, Madhavan School of Electrical and Computer Engineering 3D Systems Packaging Research Center Georgia Institute of Technology Atlanta USA School of Material Science and Engineering 3D Systems Packaging Research Center Georgia Institute of Technology Atlanta USA

ISBN: (数字)9781665450751

ISBN: (纸本)9781665450751

Heterogeneous integration of voltage regulators in power delivery networks is a growing trend that employs embedded inductor as a key component in significantly improving the power distribution. In this work, we propose a neural network framework called the hierarchical invertible neural transport for the inverse design of an embedded inductor. With this invertible method, we obtain the probability distributions of the parameters of the embedded inductor design space that most likely satisfy the desired specifications. We also learn the impedance response for free in the forward design. In the forward design, our results show a 2.14% normalized mean square error when compared with the output response of a fullwave EM simulator.

关键词： power delivery inverse design emdedded inductor neural networks transport maps

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Light extraction improvement via ITO p-electrodes for InGaN red micro-LEDs emitting at 640 nm

Optics Continuum

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Optics Continuum 2025年第5期4卷 1040-1050页

作者： Cesur Altinkaya Mohammed A Najmi Daisuke Iida Kazuhiro Ohkawa Material Science and Engineering Program Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia cesur.altinkaya@kaust.edu.sa Electrical and Computer Engineering Program Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia daisuke.iida@kaust.edu.sa kazuhiro.ohkawa@kaust.edu.sa

We present light extraction efficiency (LEE) improvement for InGaN red micro-light emitting diodes (micro-LEDs) of various sizes operating at low current densities. We compared the characteristics of micro-LEDs with indium tin oxide (ITO) transparent p-electrodes with conventional opaque metal p-electrodes. 50 µm × 50 µm micro-LEDs with ITO p-electrodes achieved a peak on-wafer external quantum efficiency (EQE) of 2.54% with an emission wavelength of 640 nm at a current density as low as 0.4 A/cm 2 . This represents a 1.18-fold improvement in peak EQE compared to devices with metal p-electrodes. Light ray tracing simulation confirmed that the ITO p-electrodes exhibit 1.18 times higher light escape than metal-based micro-LEDs, validating the role of enhanced light extraction. These findings provide valuable insights for advancing high-definition display and VR applications.

关键词： Atomic layer deposition Indium tin oxide Light extraction Opacity Quantum efficiency Ray tracing

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Past,present and future of indium phosphide quantum dots

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Nano Research 2022年第5期15卷 4468-4489页

作者： Houman Bahmani Jalali Sadra Sadeghi Itir Bakis Dogru Yuksel Asim Onal Sedat Nizamoglu Graduate School of Biomedical Science and Engineering KoçUniversityIstanbul 34450Turkey Department of Electric and Electronics Engineering KoçUniversityIstanbul 34450Turkey Department of Material Science and Engineering KoçUniversityIstanbul 34450Turkey Present address:Photonic Nanomaterials Group Istituto Italiano di TecnologiaGenova 16124Italy Present address:Department of Electrical and Computer Engineering Queen's UniversityKingston K7L 3N6Canada Present address:Nanophotonics Group Debye Institute for Nanomaterials ScienceUtrecht UniversityUtrecht 3508 TAThe Netherlands

Indium phosphide(InP)colloidal quantum dots(QDs)have been drawn significant attention as a potentially less toxic alternative to cadmium-based QDs over the past two *** advances in their colloidal synthesis methods have allowed for the synthesis of a wide variety of compositions,heterojunctions,dopants,and ligands that enabled spectral tunability from blue to near-infrared,narrow emission linewidths,and perfect quantum yields approaching ***,it has higher covalency compared to cadmium chalcogenides leading to improved optical *** state-of-the-art InP QDs with appealing optical and electronic properties have excelled in many applications such as light-emitting diodes,luminescent solar concentrators(LSCs),and solar cells with high potential for *** review focuses on the history,recent development,and future aspect of synthesis and application of colloidal InP QDs.

关键词： indium phosphide InP quantum dot nanocrystal synthesis colloidal doping

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Title: Device for detection of activity-dependent changes in neural spheroids at MHz and GHz frequencies

arXiv

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arXiv 2024年

作者： Omidi, Saeed Fabi, Gianluca Wang, Xiaopeng Hwang, James C.M. Berdichevsky, Yevgeny Department of Bioengineering Lehigh University Bethlehem United States Department of Material Science and Engineering Cornell University Ithaca United States Department of Electrical and Computer Engineering Bethlehem United States

Intracellular processes triggered by neural activity include changes in ionic concentrations, protein release, and synaptic vesicle cycling. These processes play significant roles in neurological disorders. The beneficial effects of brain stimulation may also be mediated through intracellular changes. There is a lack of label-free techniques for monitoring activity-dependent intracellular changes. Electromagnetic (EM) waves at frequencies larger than 1x106 Hz (1 MHz) were previously used to probe intracellular contents of cells, as cell membrane becomes "invisible" at this frequency range. EM waves interact with membranes of intracellular organelles, proteins, and water in the MHz – GHz range. In this work, we developed a device for probing the interaction between active neurons’ intracellular contents and EM waves. The device used an array of grounded coplanar waveguides (GCPWs) to deliver EM waves to a three-dimensional (3D) spheroid of rat cortical neurons. Neural activity was evoked using optogenetics, with synchronous detection of propagation of EM waves. Broadband measurements were conducted in the MHz-GHz range to track changes in transmission coefficients. Neuronal activity was found to reversibly alter EM wave transmission. Pharmacological suppression of neuronal activity abolished changes in transmission. Time constants of changes in transmission were in the seconds – tens of seconds range, suggesting the presence of relatively slow, activity-dependent intracellular processes. This study provides the first evidence that EM transmission through neuronal tissue is activity-dependent in MHz – GHz range. Device developed in this work may find future applications in studies of the mechanisms of neurological disorders and the development of new therapies. © 2024, CC BY-NC-ND.

关键词： Neurons

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SPARC-LoRa: A Scalable, Power-efficient, Affordable, Reliable, and Cloud Service-enabled LoRa Networking System for Agriculture Applications

SPARC-LoRa: A Scalable, Power-efficient, Affordable, Reliabl...

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IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySPAN

作者： Xi Wang Bryan Hatasaka Zhengyan Liu Sayali Tope Mohit Karkhanis Seungbeom Noh Farhan Sium Ravi V. Mural Hanseup Kim Carlos Mastrangelo Ling Zang James Schnable Mingyue Ji Department of Electrical and Computer Engineering University of Utah Department of Agronomy Horticulture and Plant Science South Dakota State University Department of Material Science and Engineering University of Utah Department of Agronomy and Horticulture University of Nebraska-Lincoln

ISBN: (数字)9798350317640

ISBN: (纸本)9798350317657

With the rapid development of cloud and edge computing, Internet of Things (IoT) applications have been deployed in various aspects of human life. In this paper, we design and implement a holistic IoT system with LoRa communication capabilities, named SPARC-LoRa, which consists of field sensor nodes and a gateway connected to the Internet. SPARC-LoRa has the following important features. First, the proposed wireless network of SPARC-LoRa is event-driven and using off-the-shelf microcontroller and LoRa communication modules with a customized PCB design to integrate all the hardware. This enables SPARC-LoRa to achieve low power consumption, long range communication, and low cost. With a new connection-based upper layer protocol design, the scalability and communication reliability of SPARC-loRa can be achieved. Second, an open source software including sensor nodes and servers is designed based on Docker container with cloud storage, computing, and LTE functionalities. Furthermore, in order to achieve reliable wireless communication under extreme conditions, a relay module is designed and applied to SPARC-LoRa to forward the data from the sensor nodes to the gateway node. The server side software platform consists of 1) MQTT protocol publishing measured data from the gateway node to the cloud servers using LTE connections; 2) InfluxDB database for data storage; and 3) Grafana data web server for accessing the measured data from any platforms or web browsers. The system design and implementation is completely open source and hosted on the DigitalOcean Droplet Cloud. Hence, the proposed system enables further research and applications in both academia and industry. Finally, the proposed system has been tested in real fields under different and extreme environmental conditions in Salt Lake City, Utah and the University of Nebraska-Lincoln. The experimental results validate the features of SPARC-LoRa including low power, reliability, and cloud services provided by SPARC-L

关键词： Cloud computing Protocols Scalability Urban areas LoRa Logic gates Reliability engineering

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SPARC-LoRa: A Scalable, Power-efficient, Affordable, Reliable, and Cloud Service-enabled LoRa Networking System for Agriculture Applications

arXiv

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arXiv 2024年

作者： Wang, Xi Hatasaka, Bryan Liu, Zhengyan Tope, Sayali Karkhanis, Mohit Noh, Seungbeom Sium, Farhan Mural, Ravi V. Kim, Hanseup Mastrangelo, Carlos Zang, Ling Schnable, James Ji, Mingyue Department of Electrical and Computer Engineering University of Utah United States Department of Material Science and Engineering University of Utah United States Department of Agronomy and Horticulture University of Nebraska-Lincoln United States

With the rapid development of cloud and edge computing, Internet of Things (IoT) applications have been deployed in various aspects of human life. In this paper, we design and implement a holistic LoRa-based IoT system with LoRa communication capabilities, named SPARC-LoRa, which consists of field sensor nodes and a gateway connected to the Internet. SPARC-LoRa has the following important features. First, the proposed wireless network of SPARC-LoRa is even-driven and using off-the-shelf microcontroller and LoRa communication modules with a customized PCB design to integrate all the hardware. This enables SPARC-LoRa to achieve low power consumption, long range communication, and low cost. With a new connection-based upper layer protocol design, the scalability and communication reliability of SPARC-loRa can be achieved. Second, an open source software including sensor nodes and servers is designed based on Docker container with cloud storage, computing, and LTE functionalities. In order to achieve reliable wireless communication under extreme conditions, a relay module is designed and applied to SPARC-LoRa to forward the data from sensor nodes to the gateway node. The server side software platform consists of 1) MQTT protocol publishing measured data from the gateway node to the cloud servers using LTE connections;2) InfluxDB database for data storage;and 3) Grafana data web server for accessing the measured data from any platforms or web browsers. The system design and implementation is completely open source and hosted on the DigitalOcean Droplet Cloud. Hence, the proposed system enables further research and applications in both academia and industry. The proposed system has been tested in real fields under different and extreme environmental conditions in Salt Lake City, Utah and the University of Nebraska-Lincoln. The experimental results validate the features of SPARC-LoRa including low power, reliability, and cloud services provided by SPARC-LoRa. © 2024, CC BY

关键词： Internet of things

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Self-Trapped Exciton in One-Dimensional CsCu2I3 Nanowires

Self-Trapped Exciton in One-Dimensional CsCu2I3 Nanowires

引用

CLEO: science and Innovations, S and I 2022

作者： Xing, Xinxin Tong, Tian Mohebinia, Mohammadjavad Wang, Zhiming Bao, Jiming Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu610054 China Department of Electrical & Computer Engineering University of Houston HoustonTX77204 United States Material Science and Engineering University of Houston HoustonTX77204 United States

ISBN: (纸本)9781557528209

Low-dimensional CsCu2I3 perovskite has recently attracted extensive attention for its unique structure and photoelectric properties. We demonstrate a detailed spectroscopy study of its self-trapped exciton emission and present a fundamental understanding of the electron-phonon interaction. © Optica Publishing Group 2022, © 2022 The Author(s)

关键词： Cesium compounds

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Parallel FBGs in Sapphire Fiber for High Temperature Sensing 27

Parallel FBGs in Sapphire Fiber for High Temperature Sensing

引用

27th International Conference on Optical Fiber Sensors, OFS 2022

作者： Shi, Guannan Pickrell, Gary Wang, Anbo Zhu, Yizheng Bradley Department of Electrical and Computer Engineering Center for Photonics Technology Virginia Tech BlacksburgVA24061 United States Department of Material Science and Engineering Center for Photonics Technology Virginia Tech BlacksburgVA24061 United States

This paper presents parallel FBGs in sapphire fiber to significantly boost the signal intensity of high order FBGs. Cascaded parallel FBGs are fabricated and achieve multi-point high temperature sensing. © 2022 T... 详细信息

ISBN: (纸本)9781957171142

关键词： Sapphire

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Nanopyramid Semipolar Quantum Dot LED Through Selective Area Growth

Nanopyramid Semipolar Quantum Dot LED Through Selective Area...

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IEEE International Semiconductor Laser Conference

作者： Cheng Liu Nikhil Pokharel Qinchen Lin Miguel A. Betancourt Ponce Shining Xu Guangying Wang Surjava Sanyal Padma Gopalan Chirag Gupta Shubhra S. Pasayat Luke J. Mawst Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI U.S. Department of Material Science and Engineering University of Wisconsin-Madison Madison WI U.S.

We report the successful electrical operation of a nanopyramid semipolar quantum dot LED emitting at 455 nm. The quantum dots were formed by nano-scale selective area growth, while the cap layer was fabricated through... 详细信息

ISBN: (数字)9798350372991

ISBN: (纸本)9798350373004

关键词： Quantum dot lasers Light emitting diodes MOCVD

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Effect of O2 Exposure on Silicon Field Emitter Arrays Style

Effect of O2 Exposure on Silicon Field Emitter Arrays Style

引用

International Conference on Vacuum Nanoelectronics (IVNC)

作者： Reza Farsad Asadi Tao Zheng Girish Rughoobur Ranajoy Bhattacharya Jim Browning Akintunde I. Akinwande Bruce Gnade Department of Electrical and Computer Engineering Southern Methodist University Dallas TX USA Department of Electrical and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Electrical and Computer Engineering Boise State University Boise ID USA Department of Material Science and Engineering University of Texas at Dallas Richardson TX USA

The impact of Oxygen (O 2 ) exposure on Silicon Field Emitter Arrays (Si-FEA) was studied. A 50×50 array of Silicon field emitters was tested at 1000V DC anode and 45V DC gate voltage in 6×10 −10 Torr before 10– 7 Torr partial pressure of O 2 was introduced into the chamber. The results indicate that the anode current degradation rate is approximately 0.1 percent per Langmuir of O 2 exposure. This study can provide guidelines for the vacuum packaging requirements of Si-FEAs.

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