Article
Chemistry, Physical
Wenbin Zhang, Boxiang Wang, Changying Zhao
Summary: By utilizing Bayesian optimization, a highly selective thermophotovoltaic emitter with a high figure of merit can be designed to reduce thermal losses and improve the efficiency of photovoltaic cells. The efficiency of the TPV system was analyzed, and the thermal stability of the fabricated samples was measured, demonstrating the effectiveness of Bayesian optimization in designing selective TPV emitters. Additionally, the machine-learning-based design of metamaterials can be extended to solve expensive black-box global optimization problems in various field applications.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Optics
M. Merkel, J. Imbrock, C. Denz
Summary: Novel diffractive surface structures were designed, evaluated, and optimized to achieve a significant increase in current density in organic solar cells. After comparing different surface patterns and further parameter optimization, a final current density enhancement of 5% was achieved.
Article
Engineering, Environmental
Junjie Pan, Xinji Li, Wei Xia, Hongjiao Qu, Jingjing Li, Cheng Jiang, Tao Wang, Jianping He
Summary: Low-dimensional carbon matrix magnetic nanocomposites have promising potential as lightweight microwave absorbers due to their large specific surface area and multiple attenuation characteristics. Acid etching and subsequent thermal reduction successfully synthesized two-dimensional flaky MOF-derived porous nanocomposites. The study reveals that acid etching improves multiple interfaces and carbon defects, benefiting the enhancement of multiple interfacial polarization and relaxation polarization loss. The generated ferromagnetic products, Ni4N and CoFe, contribute to the improvement of magnetic loss ability. Moreover, the multilayer impedance gradient design optimizes the impedance matching characteristic. The prepared bilayer absorbing coating demonstrates excellent microwave absorption properties at a thickness of 2.5 mm and a filling amount less than 15 wt%.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Juntao Wang, Fang Xu, Fangmei Liu, Dong Zhao
Summary: The study reveals that optical bistability, tristability, and multistability can be achieved in a complex structure composed of graphene and dielectric multilayers by optimizing the structure and tuning the incident wavelength. This paves the way for new types of all-optical multivalued switches, optical logic elements, and optical storage devices.
Article
Materials Science, Multidisciplinary
Prabudhya Roy Chowdhury, Krutarth Khot, Jiawei Song, Zihao He, David Kortge, Zherui Han, Peter Bermel, Haiyan Wang, Xiulin Ruan
Summary: Machine learning methods are used to discover and optimize the structure of multilayers for desired transport properties and reflectance. By introducing aperiodicity in layer thicknesses, a binary aperiodic multilayer with significantly enhanced reflectance is discovered. A genetic algorithm optimizer efficiently finds optimized structures, which show unexpected layer patterns. The effectiveness of the optimized multilayer is experimentally confirmed and validated.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Antonio L. Avila-Marin, Jesus Fernandez-Reche, Sandro Gianella, Luca Ferrari, Daniel Sanchez-Senoran
Summary: This work presents an experimental thermal evaluation of new and innovative porous morphologies suitable for volumetric solar receivers. The results show that the Voronoi morphology can achieve performance improvement compared to traditional morphologies.
Article
Multidisciplinary Sciences
Jincheng Ni, Shunli Liu, Dong Wu, Zhaoxin Lao, Zhongyu Wang, Kun Huang, Shengyun Ji, Jiawen Li, Zhixiang Huang, Qihua Xiong, Yanlei Hu, Jiaru Chu, Cheng-Wei Qiu
Summary: This study demonstrates an orbital-angular-momentum-assisted approach to generate chiroptical signals with monochromatic light, achieving a gigantic vortical differential scattering on intrinsically chiral microstructures fabricated by femtosecond laser. The VDS measurements can robustly generate chiroptical properties on microstructures with varying geometric features and detect chiral molecules with high sensitivity. This approach paves the way for efficiently chiroptical discrimination of multiscale chiral structures with photonic orbital angular momentum, simplifying and complementing conventional CD spectroscopy for measuring weak optical chirality on mesoscale chiral architectures and macromolecules.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Mechanics
Rong Chiu, Wenbin Yu
Summary: Heterogeneous Solid Element (HSE) models a heterogeneous body as an equivalent solid element based on Mechanics of Structure Genome (MSG), providing higher accuracy compared to traditional multiscale modeling techniques for composite materials. HSE homogenizes heterogeneous microstructures into equivalent solid elements, introducing a novel concept for multiscale modeling.
COMPOSITE STRUCTURES
(2022)
Article
Green & Sustainable Science & Technology
Robin Tim Broeske, Peter Schwarzbozl, Lisa Birkigt, Srdan Vasic, Sebastian Dung, Till Doerbeck, Bernhard Hoffschmidt
Summary: Solar tower plants play a significant role in the global energy transition, with open volumetric air receiver technology providing an alternative to molten salt receivers. Research shows that 3D-shaped absorber designs offer the highest efficiency potential, and advancements in manufacturing techniques make it possible to realize these designs. Experimental results demonstrate the great potential of the new absorbers, which outperform existing structures and achieve high thermal efficiencies under high temperature conditions.
Article
Engineering, Electrical & Electronic
Majed Amini, Milad Kamkar, Farhad Rahmani, Ahmadreza Ghaffarkhah, Farhad Ahmadijokani, Mohammad Arjmand
Summary: This study developed EMI shielding materials with outstanding absorption performance by synthesizing magnetic Zn0.5Ni0.5Fe2O4 nanoparticles and using a multilayer assembly of PVDF sheets containing reduced graphene oxide and ZnNiFe. Increasing the number of layers and adding magnetic nanoparticles led to enhanced EMI shielding effectiveness, with an absorption coefficient of over 91% achieved in a nine-layer sample, the highest ever reported absorbance for a polymer-based EMI shield.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Optics
Lin Wang, Debao Fang, Haibo Jin, Jingbo Li
Summary: This paper proposes a novel Global NV-ETM RCWA method to accelerate the optimization of periodic stepped radar absorbing structures. The method improves the convergence rate for dielectric and magnetic metasurfaces by utilizing the NV field and ETM approach. The optimization results demonstrate a significant increase in computational efficiency, providing a powerful tool for designing metasurface absorbers with desired functionalities.
Article
Materials Science, Ceramics
Hanjun Wei, Jie Liu, Pei Feng, Shenquan Yang, Jimei Xue, Cunxian Wang, Feng Zhao, Qingyuan Wang
Summary: A novel SiO2/SiC-Y2Si2O7 composite ceramic with a multilayer cauliflower-like structure is developed, which exhibits superior electromagnetic wave absorption properties. SiC enhances the complex permittivity and attenuation capabilities, while the SiO2 layer acts as an impedance matching mediator.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Tobias Rosnitschek, Rick Hentschel, Tobias Siegel, Claudia Kleinschrodt, Markus Zimmermann, Bettina Alber-Laukant, Frank Rieg
Summary: The article discusses the development of a freeware framework using hybrid topology optimization algorithm and manufacturing constraints to design manufacturable prototypes, as well as the experimental testing of one-click optimized parts. The test results show that the design proposals created while applying finite spheres and two-step smoothing are equal to manually redesigned parts based on the optimization results, demonstrating the potential of one-click development for rapid and direct prototype development and fabrication.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Chris Sparling, Dave Townsend
Summary: This article discusses examples of extracting meaningful information from image projection data using tomographic reconstruction techniques, and introduces alternative strategies for photochemical imaging. The article demonstrates the advantages of these strategies and how they can outperform current commonly used methods. Notably, the Hankel Transform Reconstruction (HTR) provides a bound for the minimum number of projections needed to reliably reconstruct 3D photoproduct distributions.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Ceramics
Chunhao Wan, Jiayi Wang, Zexuan Li, Shansheng Yu, Xiaoyi Wang, Hongwei Tian
Summary: Yolk-shell structure microwave absorbers have been extensively studied for impedance matching. This study explores the improvement of impedance matching through heteroatoms doping in a CoFe2O4@HCN composite material, which showed excellent absorption performance.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Francis O. Afzal, Sami Halimi, Sharon M. Weiss
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2019)
Article
Optics
Gilberto A. Rodriguez, Petr Markov, Alyssa P. Cartwright, Moinul H. Choudhury, Francis O. Afzal, Tengfei Cao, Sami Halimi, Scott T. Retterer, Ivan I. Kravchenko, Sharon M. Weiss
Article
Optics
Francis O. Afzal, Joshua M. Petrin, Sharon M. Weiss
Article
Engineering, Electrical & Electronic
Yu-Po Wong, Simon Lorenzo, Yu Miao, Jeremy Bregman, Olav Solgaard
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2019)
Article
Engineering, Electrical & Electronic
Simon Lorenzo, Yu-Po Wong, Olav Solgaard
IEEE SENSORS JOURNAL
(2020)
Article
Engineering, Electrical & Electronic
Francis O. Afzal, Yusheng Bian, Bo Peng, Shuren Hu, Abdelsalam Aboketaf, Kevin K. Dezfulian, Karen Nummy, Andy Stricker, Crystal Hedges, Zoey Sowinski, Michal Rakowski, Won Suk Lee, Rod Augur, Dave Riggs, Ken Giewont, Sharon M. Weiss
IEEE PHOTONICS TECHNOLOGY LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Simon Lorenzo, Olav Solgaard
IEEE SENSORS JOURNAL
(2020)
Article
Optics
Sami Halimi, Zhongyuan Fu, Francis O. Afzal, Joshua A. Allen, Shuren Hu, Sharon M. Weiss
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2020)
Article
Engineering, Electrical & Electronic
Simon Lorenzo, Anne Kroo, Yu-Po Wong, Olav Solgaard
Summary: This paper presents a temperature-compensated optical fiber platform for silicon sensors. It demonstrates that thermal effects in silicon sensors are significant at operational temperatures, but can be compensated using a nano-fabricated temperature sensor. The platform shows sufficient sensitivity and bandwidth to reduce thermal signals in silicon pressure sensors and microphones significantly.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Simon Lorenzo, Olav Solgaard
Summary: We have developed a wavelength-multiplexed system of optical fiber-based photonic-crystal microphones for acoustic source localization. The system is capable of accurately localizing sound sources in the environment with a wide bandwidth and high sensitivity.
IEEE SENSORS JOURNAL
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Yusheng Bian, Colleen Meagher, Karen Nummy, Sujith Chandran, Won Suk Lee, Abdelsalam Aboketaf, Danhao Ma, Ryan Sporer, Michal Rakowski, Nuh Yuksek, Monica Esopi, Bo Peng, Yangyang Liu, Abu Thomas, Tymon Barwicz, Takako Hirokawa, Javier Ayala, Asli Sahin, Andy Stricker, Subramanian Krishnamurthy, Shuren Hu, Zoey Sowinski, Kate McLean, Louis Medina, Kevin Dezfulian, Michelle Zhang, Mona Nafari, Zhuoqiang Jia, Kaushikee Mishra, Asif Chowdhury, Francis Afzal, Brendan Harris, Salman Mosleh, Bruna Paredes, Marcus Dahlem, Jaime Viegas, Rod Augur, Dave Riggs, Luke Lee, Wenhe Lin, Ajey Jacob, Fen Jamin, Mai Randall, Hemanth Parsa, Vikas Gupta, Anthony Yu, Ken Giewont, Ted Letavic, John Pellerin
Summary: A comprehensive set of SiN building blocks, including low-loss SiN waveguides, Si-SiN transitions, efficient polarization splitters/rotators, and compact ring WDM filters, was demonstrated on a monolithic SiPh platform at O-band.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
Article
Computer Science, Information Systems
Simon Lorenzo, Yu-Po Wong, Olav Solgaard
Summary: This paper describes the design, characterization, and testing of a compact hydrophone capable of measuring acoustic signals from cardiomyocytes. The hydrophone can operate in small liquid volumes and incorporates a microchannel to vent air during immersion. Modeling and experimental results show good sensitivity and precision in detecting nanometer-scale displacements.
Proceedings Paper
Engineering, Electrical & Electronic
Simon Lorenzo, Yu-Po Wong, Olav Solgaard
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Simon Lorenzo, Yu-Po Wong, Olav Solgaard
2019 20TH INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS & EUROSENSORS XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Sami I. Halimi, Zhongyuan Fu, Francis O. Afzal, Joshua A. Allen, Shuren Hu, Sharon M. Weiss
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)