Article
Optics
W. Zhang, M. Ebert, J. D. Reynolds, B. Chen, X. Yan, H. Du, M. Banakar, D. T. Tran, C. G. Littlejohns, G. T. Reed, D. J. Thomson
Summary: This article demonstrates an efficient spot-size converter (SSC) based on a buried three-dimensional (3D) taper for low-loss optical mode transition between large and small waveguides. The SSC can facilitate scalable, low-loss coupling between on-chip waveguides of different sizes and external components, addressing challenges in packaging and assembly of photonic integrated circuits.
Article
Engineering, Electrical & Electronic
Danyang Luo, Wei He, Zhongjun Jiang, Kai Xu, Yingjian Liu, Liang Wang
Summary: Spot size converters (SSCs) are widely used in photonic integrated circuits (PICs) to reduce coupling loss between single mode fiber and waveguide. This letter proposes and fabricates an InGaAs/InP vertically tapered SSC using contact lithography. The fabricated SSC has a length of 1000 μm and a height of 1 μm. It improves the alignment tolerance by achieving +/-2.5 μm (horizontal) and +/- 3.0 μm (vertical) with a 1 dB alignment tolerance. The insertion loss is reduced from 1.8 dB to 1.0 dB.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Danyang Luo, Wei He, Zhongjun Jiang, Kai Xu, Yingjian Liu, Liang Wang
Summary: The article introduces an InGaAs/InP vertically tapered spot size converter, fabricated using contact lithography. It significantly reduces the coupling loss between single mode fiber and waveguide in photonic integrated circuits, improving the 1 dB alignment tolerance and insertion loss.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Chemistry, Analytical
Jianping Yu, Jian Xu, Aodong Zhang, Yunpeng Song, Jia Qi, Qiaonan Dong, Jianfang Chen, Zhaoxiang Liu, Wei Chen, Ya Cheng
Summary: We propose a hybrid laser microfabrication approach for the manufacture of three-dimensional optofluidic spot-size converters. The method combines femtosecond laser microfabrication and carbon dioxide laser irradiation to create complex microchannel structures in glass and achieve size conversion by filling them with liquid-core waveguide solution. Experimental results demonstrate high conversion efficiency and low insertion loss of this method.
Article
Optics
Md Mahadi Masnad, Guowu Zhang, Dan-Xia Xu, Yuri Grinberg, Odile Liboiron-Ladouceur
Summary: Computational inverse design techniques have been demonstrated as reliable means for designing compact nanophotonic devices without compromising performance. This paper presents experimental evidence of efficient and robust mode converters on the silicon-on-insulator platform, showcasing their mode conversion mechanism and performance in high throughput data communications.
Article
Engineering, Electrical & Electronic
Ramanuja Panigrahi, Santanu K. Mishra, Avinash Joshi, Khai D. T. Ngo
Summary: This article proposes a systematic synthesis method to identify the optimum converter topology for a specified voltage conversion ratio. The method consists of two processes: synthesizing distinct topologies and identifying the optimal topology based on performance metrics. The feasibility of synthesized topologies is validated through PLECS simulation, and case studies are used to explain the selection criteria.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Physics, Applied
Hao Gao, Ze-Wei Wang, Zi-Xiang Xu, Jing Yang, Bin Liang, Jian-Chun Cheng
Summary: This research presents and experimentally implements a tunable acoustic metagrating assisted by deep learning for multifunctional wavefront modulation. With the configuration optimization of structure parameters and Willis coupling magnitude, various extraordinary wavefront modulations are achieved, including abnormal reflection, perfect beam splitting, and multi-channel energy distribution in arbitrary ratios. The method exhibits high accuracy, efficiency, flexibility, and refined abstraction of a physical mechanism, paving the way for combining deep learning and pragmatic multifunctional acoustic applications.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Graham R. Davis, Thomas Beckenbach, Pascal Meyer
Summary: Imaging the focal spot size in X-ray generators can be achieved using a pinhole in a highly attenuating material, such as gold. When the focal spot is very small, a thin material is required to avoid impractical aspect ratio. A coded aperture has been used to reduce exposure time, but not to increase SNR at low attenuation. In this study, a modified uniformly redundant array technique was used to clearly visualize and quantify the focal spot.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Mingxuan Li, Yue Wang, Weihao Hu, Sirui Shu, Peng Yu, Zhenyuan Zhang, Frede Blaabjerg
Summary: This article develops a unified dynamic power coupling model to quantitatively analyze and assess the power coupling characteristics of various types of grid-forming strategies. The analysis reveals that droop control helps weaken power coupling while VSG control is prone to amplify it. Additionally, the influence of pivotal control parameters in droop and VSG controllers on power coupling characteristics are discussed.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Biomedical
Bowen Lin, Shujun Fu, Yuting Lin, Ronny L. Rotondo, Weizhang Huang, Harold H. Li, Ronald C. Chen, Hao Gao
Summary: Pencil beam scanning proton radiotherapy can achieve improved dose conformality around the tumor targets, as well as enhanced delivery efficiency and robustness, by utilizing adaptive spot placement methods.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Eva Loukogeorgaki, Constantine Michailides, George Lavidas, Ioannis K. Chatjigeorgiou
Summary: This study focuses on determining the optimal linear arrangement of oscillating wave energy converters to maximize energy absorption annually and meet spatial constraints. Through an efficient optimization framework, it is possible to identify the layout of WECs that achieve the highest energy absorption at specific marine sites, with observations showing that placing the array close to the wall and forming clusters of densely-positioned WECs can lead to maximum energy absorption ability.
Article
Multidisciplinary Sciences
Lijun Ran, Xin Li, Kang Wang, Huihui Liu
Summary: This paper proposes the "dual circulation" development pattern as a major economic strategy in China. A study conducted on firms located in the Haidian Science and Technology Park in Zhongguancun between 2013 and 2019 constructs an index system to measure the synergy of dual circulation coupling among these firms. The empirical results show that the dual circulation coupling synergy significantly contributes to firm survival by promoting innovation, market demand, and resource allocation efficiency.
Article
Computer Science, Software Engineering
Hailong Yang, Zuyuan Yang, Lingjiang Li, Junhang Chen
Summary: In this paper, we propose improved Kalman filter algorithms (IKF) with prior information to reduce the negative influence of noise on the spot size in laser-quality detection. The filtering process and the method of determining the initial filter value are also provided. Experimental results on synthetic and real-world datasets show that the proposed IKF outperforms compared methods.
Article
Engineering, Electrical & Electronic
Yanran Li, Honglin Song, Jie Jiang
Summary: A vertical short-channel Ga2O3 thin-film transistor (TFT) is proposed to address security threats in critical hardware components. The device has an ultrashort channel of -10 nm and operates well at a low voltage (2 V) with a reasonable current ON -OFF ratio (I-ON/I-OFF) (>10(3)). Additionally, it achieves spatiotemporal logic encryption by tuning the ion-coupling path and can only unlock the decryption function of AND logic by reducing the distance between the gate and channel. Therefore, this proposed device is regarded as a significant step towards realizing safe electronics in the future.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Marine
Jian Tan, Henk Polinder, Antonio Jarquin Laguna, Peter Wellens, Sape A. Miedema
Summary: In this paper, an optimization method for the buoy and PTO sizing of Wave Energy Converters (WECs) is proposed to reduce the Levelized Cost Of Energy (LCOE). The study found that the PTO sizing has limited impact on buoy determination, but can significantly reduce LCOE.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Quentin Wilmart, Houssein El Dirani, Nicola Tyler, Daivid Fowler, Stephane Malhouitre, Stephanie Garcia, Marco Casale, Sebastien Kerdiles, Karim Hassan, Christelle Monat, Xavier Letartre, Ayman Kamel, Minhao Pu, Kresten Yvind, Leif Katsuo Oxenlowe, Wilfried Rabaud, Corrado Sciancalepore, Bertrand Szelag, Segolene Olivier
APPLIED SCIENCES-BASEL
(2019)
Article
Chemistry, Analytical
Venkata V. B. Yallapragada, Uday Gowda, David Wong, Liam O'Faolain, Mark Tangney, Ganga C. R. Devarapu
ANALYTICAL CHEMISTRY
(2019)
Article
Engineering, Electrical & Electronic
Bertrand Szelag, Karim Hassan, Aetitia Adelmini, Elodie Ghegin, Philippe Rodriguez, Fabrice Nemouchi, Pierre Brianceau, Elisa Vermande, Antoine Schembri, David Carrara, Pierrick Cavalie, Florent Franchin, Marie-Christine Roure, Lois Sanchez, Christophe Jany, Segolene Olivier
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Joan Manel Ramirez, Hajar Elfaiki, Theo Verolet, Claire Besancon, Antonin Gallet, Delphine Neel, Karim Hassan, Egolene Olivier, Christophe Jany, Stephane Malhouitre, Kamil Gradkowski, Padraic E. Morrissey, Peter OBrien, Christophe Caillaud, Nicolas Vaissiere, Jean Decobert, Shenghui Lei, Ryan Enright, Alexandre Shen, Mohand Achouche
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2020)
Article
Chemistry, Multidisciplinary
Simone Iadanza, Chinna Devarapu, Alexandros Liles, Robert Sheehan, Liam O'Faolain
APPLIED SCIENCES-BASEL
(2020)
Article
Physics, Applied
Raouia Rhazi, Houssaine Machhadani, Catherine Bougerol, Stephane Lequien, Eric Robin, Guillaume Rodriguez, Richard Souil, Jean-Luc Thomassin, Nicolas Mollard, Yohan Desieres, Eva Monroy, Segolene Olivier, Jean-Michel Gerard
Summary: This study investigates the crystalline properties and superconducting critical temperature of ultra-thin NbN films deposited on silicon wafers, showing that deposition of NbN on an AlN buffer layer can significantly improve the critical temperature due to better crystalline quality. The optimized NbN/AlN stack has potential applications for integrating a large number of detectors on large-scale silicon wafers.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Review
Engineering, Electrical & Electronic
S. Bernabe, Q. Wilmart, K. Hasharoni, K. Hassan, Y. Thonnart, P. Tissier, Y. Desieres, S. Olivier, T. Tekin, B. Szelag
Summary: Silicon Photonics Technology has emerged as a key player in the field of fiber optic interconnects, especially with the increasing demand for higher bandwidth and lower costs. An evolution of existing manufacturing platforms is necessary to overcome challenges and pave the way for Terabit scale communications in Data Centers and High Performance Computing Systems.
SOLID-STATE ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Marco Ponzetti, Ganga Chinna Rao Devarapu, Nadia Rucci, Armando Carlone, Vittorio Saggiomo
Summary: This study proposes a modification of the open-source 3D printer Creality Ender-3 to create an inexpensive and easy-to-set-up automated microscope slide autostainer called HistoEnder. The HistoEnder can automate laboratory procedures, saving working hours, and can also be used in chemistry and material science laboratories.
Article
Engineering, Electrical & Electronic
Daivid Robert Fowler, Quentin Wilmart, Stephanie Garcia, Segolene Olivier, Bertrand Szelag
Summary: In this article, two strategies for designing a fiber grating coupler for coupling to optical fibers placed on the backside of the chip are presented. An all silicon O-band grating coupler and a hybrid silicon nitride/silicon O-band grating coupler are designed, fabricated, and measured, showing peak coupling efficiencies of -2.8 dB and -3.2 dB respectively.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Quentin Wilmart, Thomas Mang, Daivid Fowler, Stephane Brision, Karen Ribaud, Stephane Malhouitre, Stephane Bernabe, Corrado Sciancalepore, Bertrand Szelag, Segolene Olivier
SILICON PHOTONICS XV
(2020)
Proceedings Paper
Optics
Madhumidha Murugan, Patricia Loren Inacio, Ganga Rao Chinna Devarapu, Liam O'Faolain
SEVENTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS (EWOFS 2019)
(2019)
Review
Nanoscience & Nanotechnology
Stavroula Foteinopoulou, Ganga Chinna Rao Devarapu, Ganapathi S. Subramania, Sanjay Krishna, Daniel Wasserman