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Heterogeneous tunable Ⅲ-Ⅴ-on-silicon-nitride mode-locked laser emitting wide optical spectra

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Photonics Research 2024年第3期12卷 I0021-I0027页

作者： MAXIMILIEN BILLET STIJN CUYVERS STIJN POELMAN ARTUR HERMANS SANDEEP SEEMA SASEENDRA TASUKU NAKAMURA SHINYA OKAMOTO YASUHISA INADA KAZUYA HISADA TAKU HIRASAWA JOAN RAMIREZ DELPHINE NÉEL NICOLAS VAISSIÈRE JEAN DECOBERT PHILIPPE SOUSSAN XAVIER ROTTENBERG GUNTHER ROELKENS JONØ.KJELLMAN BART KUYKEN Photonics Research Group Department of Information TechnologyGhent University-imec9052 GhentBelgium imec 3001 LeuvenBelgium Technology Division Panasonic Holdings CorporationMoriguchi-CityOsakaJapan Ⅲ-Ⅴ Lab F91767 PalaiseauFrance

We demonstrate a Ⅲ-Ⅴ-on-silicon-nitride mode-locked laser through the heterogeneous integration of a semiconductor optical amplifier on a passive silicon-nitride cavity using the technique of micro-transfer printing. In the initial phase of our study, we focus on optimizing the lasing wavelength to be centered at 1550 nm. This optimization is achieved by conducting experiments with 27 mode-locked lasers, each incorporating optical amplifiers featuring distinct multiple-quantum-well photoluminescence values. Subsequently we present a comprehensive study investigating the behavior of the mode-locking regime when the electrical driving parameters are varied. Specifically, we explore the impact of the gain voltage and saturable absorber current on the locking stability of a tunable mode-locked laser. By manipulating these parameters, we demonstrate the precise control of the optical spectrum across a wide range of wavelengths spanning from 1530 to 1580 nm. Furthermore, we implement an optimization approach based on a Monte Carlo analysis aimed at enhancing the mode overlap within the gain region. This adjustment enables the achievement of a laser emitting a 23-nm-wide spectrum while maintaining a defined 10 dB bandwidth for a pulse repetition rate of 3 GHz.

关键词： tunable amplifier mode

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Information extraction from remote sensing imagery

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Geo-Spatial Information Science 2017年第4期20卷 297-298页

作者： Xin Huang Jiayi Li Wenzhi Liao Jocelyn Chanussot School of Remote Sensing and Information Engineering Wuhan University China telin-ipi-imec Ghent University Belgium Grenoble Institute of Technology France

Various platforms,such as satellite,aircraft,ground-based,some emerging aspects (***) have resulted in a dramatic improvement in the capabilities of earth observations (EO).The numerous remote sensing data promote an enhanced possibility to assess,monitor,and predict the dynamics of land-covers,anthropologic processes,and influence to the ***,the properties of the data acquired by such diverse sources pose challenges to the processing methodologies,and hence,development of a series of new methods for the analysis of remote sensing images is required,The aim of this special issue of Geospatial Information Science is to develop new ideas and technologies to facilitate the utility of remote sensing data and to further explore its potential in various applications.

关键词： Information retrieval

Chalcogenide Ovonic Threshold Switching Selector

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Nano-Micro Letters 2024年第5期16卷 1-40页

作者： Zihao Zhao Sergiu Clima Daniele Garbin Robin Degraeve Geoffrey Pourtois Zhitang Song Min Zhu National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China University of Chinese Academy of Sciences Beijing 100029People’s Republic of China imec Kapedreef 75LeuvenBelgium

Today’s explosion of data urgently requires memory technologies capable of storing large volumes of data in shorter time frames,a feat unattain-able with Flash or *** Optane,commonly referred to as three-dimensional phase change memory,stands out as one of the most promising *** Optane with cross-point architecture is constructed through layering a storage element and a selector known as the ovonic threshold switch(OTS).The OTS device,which employs chalcogenide film,has thereby gathered increased attention in recent *** this paper,we begin by providing a brief introduction to the discovery process of the OTS ***,we summarize the key elec-trical parameters of OTS devices and delve into recent explorations of OTS materials,which are categorized as Se-based,Te-based,and S-based material ***,we discuss various models for the OTS switching mechanism,including field-induced nucleation model,as well as several carrier injection ***,we review the progress and innovations in OTS mechanism ***,we highlight the successful application of OTS devices in three-dimensional high-density memory and offer insights into their promising performance and extensive prospects in emerging applications,such as self-selecting memory and neuromorphic computing.

关键词： Non-volatile memory Ovonic threshold switch(OTS) Chalcogenide Selector

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可以放在鞋盒中的数据中心

科技纵览 2024年第6期 38-43,4页

作者： Anna Herr Quentin Herr imec

比利时微电子研究中心计划利用超导缩小计算机。科学家预测,到2040年,计算消耗的电力将占全球总量的50%。这一预测是在生成式人工智能爆发之前作出的。过去十多年来,训练大型人工智能模型所需的计算资源大约每6个月就会翻一番。按照这... 详细信息

比利时微电子研究中心计划利用超导缩小计算机。科学家预测,到2040年,计算消耗的电力将占全球总量的50%。这一预测是在生成式人工智能爆发之前作出的。过去十多年来,训练大型人工智能模型所需的计算资源大约每6个月就会翻一番。按照这个速度,到2030年,训练一个人工智能模型所需的计算资源将是当前十大超级计算机年度所需资源之和的100倍。简而言之,计算需要的巨大电力能源,很快将超出地球所能提供的范围。

关键词：数据中心超级计算机人工智能计算资源电力能源微电子生成式计算消耗

Dual-logic-in-memory implementation with orthogonal polarization of van der Waals ferroelectric heterostructure

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InfoMat 2024年第2期6卷 107-117页

作者： Jingjie Niu Sumin Jeon Donggyu Kim Sungpyo Baek Hyun Ho Yoo Jie Li Ji-Sang Park Yoonmyung Lee Sungjoo Lee SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Nano Science and Technology Sungkyunkwan UniversitySuwonRepublic of Korea Department of Electrical and Computer Engineering Sungkyunkwan UniversitySuwonRepublic of Korea imec HeverleeBelgium Department of Nano Engineering Sungkyunkwan UniversitySuwonRepublic of Korea

The rapid advancement of AI-enabled applications has resulted in an increasing need for energy-efficient computing ***-in-memory is a promising approach for processing the data stored in memory,wherein fast and efficient computations are possible owing to the parallel execution of reconfigurable logic *** this study,a dual-logic-in-memory device,which can simultaneously perform two logic operations in four states,is demonstrated using van der Waals ferroelectric field-effect transistors(vdW FeFETs).The proposed dual-logic-in-memory device,which also acts as a twobit storage device,is a single bidirectional polarization-integrated ferroelectric field-effect transistor(BPI-FeFET).It is fabricated by integrating an in-plane vdW ferroelectric semiconductor SnS and an out-of-plane vdW ferroelectric gate dielectric material—CuInP_(2)S_(6).Four reliable resistance states with excellent endurance and retention characteristics were *** two-bit storage mechanism in a BPI-FeFET was analyzed from two perspectives:carrier density and carrier injection controls,which originated from the out-of-plane polarization of the gate dielectric and in-plane polarization of the semiconductor,*** conventional multilevel FeFETs,the proposed BPIFeFET does not require additional pre-examination or erasing steps to switch from/to an intermediate polarization,enabling direct switching between the four memory *** utilize the fabricated BPI-FeFET as a dual-logic-inmemory device,two logical operations were selected(XOR and AND),and their parallel execution was *** types of logic operations could be implemented by selecting different initial states,demonstrating various types of functions required for numerous neural network *** flexibility and efficiency of the proposed dual-logic-in-memory device appear promising in the realization of next-generation low-power computing systems.

关键词： ferroelectric field-effect transistor in-plane ferroelectricity logic-in-memory out-of-plane ferroelectricity

Photonic integration technologies for indoor optical wireless communications

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Science China(Information Sciences) 2018年第8期61卷 51-63页

作者： Yuqing JIAO Zizheng CAO Institute for Photonic Integration (ipi) Eindhoven University of Technology

Indoor optical wireless communication(OWC) using steerable infrared beams is regarded as an important component in future 5 G network. Photonic integration technologies can meet the criteria of such application, and provide low-cost, high-performance and very compact chips. In this paper, we review the recent development of photonic integration technologies suitable for indoor OWC application, and discuss in detail the current status and future opportunities of several key devices, such as the chip to free space couplers, integrated receivers and transmitters.

关键词： photonic integration indium phosphide(In P) silicon 5G optical wireless communication(OWC)

Feature detection and description for image matching:from hand-crafted design to deep learning

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Geo-Spatial Information Science 2021年第1期24卷 58-74,I0009页

作者： Lin Chen Franz Rottensteiner Christian Heipke Institute of Photogrammetry and GeoInformation(ipi) Leibniz Universität HannoverHannoverGermany

In feature based image matching,distinctive features in images are detected and represented by feature *** is then carried out by assessing the similarity of the descriptors of potentially conjugate *** this paper,we first shortly discuss the general ***,we review feature detection as well as the determination of affine shape and orientation of local features,before analyzing feature description in more *** the feature description review,the general framework of local feature description is presented ***,the review discusses the evolution from hand-crafted feature descriptors,***(Scale Invariant Feature Transform),to machine learning and deep learning based *** machine learning models,the training loss and the respective training data of learning-based algorithms are looked at in more detail;subsequently the various advantages and challenges of the different approaches are ***,we present and assess some current research directions before concluding the paper.

关键词： Image matching affine shape estimation feature orientation descriptor learning image orientation

Kinetic Monte Carlo simulations of plasma-surface reactions on heterogeneous surfaces

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Frontiers of Chemical Science and Engineering 2019年第4期13卷 815-822页

作者： Daniil Marinov imec 3001 LeuvenBelgium

Reactions of atoms and molecules on chamber walls in contact with low temperature plasmas are important in various technological ***-surface interactions are complex and relatively poorly *** performed over the last decade by several groups prove that interactions of reactive species with relevant plasma-facing materials are characterized by distributions of adsorption energy and *** this paper,we develop a kinetic Monte Carlo(KMC)model that can effectively handle chemical kinetics on such heterogenous *** this model,we analyse published adsorption-desorption kinetics of chlorine molecules and recombination of oxygen atoms on rotating substrates as a test case for the KMC model.

关键词： plasma-surface interaction kinetic Monte Carlo plasma nano technology

Lithium-Metal-Free Sulfur Batteries with Biochar and Steam-Activated Biochar-Based Anodes from Spent Common Ivy

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Energy & Environmental Materials 2024年第6期7卷 118-128页

作者： Pejman Salimi Willem Vercruysse Susana Chauque Saeed Yari Eleonora Venezia Amine Lataf Nahal Ghanemnia Muhammad Shajih Zafar Mohammadhosein Safari An Hardy Remo Proietti Zaccaria Dries Vandamme Istituto Italiano di Tecnologia via Morego 30Genoa 16163Italy Department of Chemistry and Industrial Chemistry University of Genovavia Dodecaneso 31Genoa I-16146Italy Analytical and Circular Chemistry(ACC) Hasselt UniversityMartelarenlaan 42Hasselt BE3500Belgium Institute for Materials Research(imo-imomec) Hasselt UniversityMartelarenlaan 42Hasselt BE3500Belgium Centre for Environmental Sciences(CMK) Hasselt UniversityMartelarenlaan 42Hasselt BE3500Belgium Energyville Thor Park 8310Genk BE3600Belgium IMEC Division IMOMECWetenschapspark 1Diepenbeek BE3590Belgium

Lithium-sulfur batteries are emerging as sustainable replacements for current lithium-ion *** commercial viability of this novel type of battery is still under debate due to the extensive use of highly reactive lithium-metal anodes and the complex electrochemistry of the sulfur *** this research,a novel sulfur-based battery has been proposed that eliminates the need for metallic lithium anodes and other critical raw materials like cobalt and graphite,replacing them with biomass-derived *** approach presents numerous benefits,encompassing ample availability,cost-effectiveness,safety,and environmental *** particular,two types of biochar-based anode electrodes(non-activated and activated biochar)derived from spent common ivy have been investigated as alternatives to metallic *** compared their structural and electrochemical properties,both of which exhibited good compatibility with the typical electrolytes used in sulfur ***,while steam activation results in an increased specific surface area,the non-activated ivy biochar demonstrates better performance than the activated biochar,achieving a stable capacity of 400 mA h g^(−1)at 0.1 A g^(−1)and a long lifespan(>400 cycles at 0.5 A g^(−1)).Our results demonstrate that the presence of heteroatoms,such as oxygen and nitrogen positively affects the capacity and cycling performance of the *** led to increased d-spacing in the graphitic layer,a strong interaction with the solid electrolyte interphase layer,and improved ion ***,the non-activated biochar was successfully coupled with a sulfur cathode to fabricate lithium-metal-free sulfur batteries,delivering a specific energy density of~600 Wh kg^(−1).

关键词： activated biochar biochar electrochemical performance functional groups lithium-metal-free sulfur batteries