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Strain-enhanced dynamic regulation of chiroptical responses in 3D suspended nested metamaterials

Optics Express 2025年第11期33卷 23440-23451页

作者： Bo Li ShiLong Duan QiuShun Zou RuanSheng Guo YiMin Chen ChenJie Gu PeiQing Zhang Xiang Shen Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo 315211 China Laboratory of Infrared Material and Devices Zhejiang Key Laboratory of Advanced Optical Functional Materials and Devices Advanced Technology Research Institute Ningbo University Zhejiang 315211 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei Anhui 230027 China

Three-dimensional (3D) chiral metamaterials, which exhibit strong chiroptical responses, have attracted tremendous attention in the broad fields of next-generation photonic devices and chiroptical spectroscopy techniques. There is an urgent need for a novel fabrication approach that enables the rapid and straightforward preparation of 3D chiral nanostructures, along with a robust strategy for achieving dynamic regulation. Here, we proposed a strain-enhanced strategy for dynamically regulating the chiroptical responses of 3D suspended nested metamaterials from the transformation of a 2D precursor. The local strain enhancement could effectively resolve the bottleneck of insufficient strain and low precision for the buckling strain self-assembly. The changing morphology and circular dichroism (CD) of 3D suspended chiral metamaterials were analyzed under the impact of a strain-enhanced effect. Then, the uplifted heights of these 3D nanostructures increased with the substrate's pre-strain ( ɛ pre ). Its CD reached up to 0.79, mainly resulting from ring electric dipoles. Interestingly, the chiroptical responses of 3D nanopyramids were regulated dynamically by controlling the substrate's pre-strain. Such a strategy provides a new pathway for achieving high-performance chiral metamaterials and offers promising applications in circularly polarized light detection, super-chiral light sources, optical communication, and advanced nanophotonic systems.

关键词： Holographic displays Luminescent materials Negative index materials Optical properties Photonic devices Refractive index

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Reference Cell Performance and Modeling on a One-Axis Tracking Surface 49

Reference Cell Performance and Modeling on a One-Axis Tracki...

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49th IEEE Photovoltaics Specialists Conference, PVSC 2022

作者： Vignola, Frank Peterson, Josh Kessler, Rich Snider, Sean Gotseff, Peter Sengupta, Manajit Habte, Aron Andreas, Afshin Mavromatakis, Fotis Material Science Institute University of Oregon EugeneOR97403 United States St. Mary's High School MedfordOR97504 United States National Renewable Energy Laboratory GoldenCO80401 United States Hellenic Mediterranean University Departmenr of Electrical and Computer Engineering Heraklion71004 Greece

ISBN: (数字)9781728161174

ISBN: (纸本)9781728161174

Performance of five silicon-based reference cells is examined on a single-axis tracking surface. The reference cells' output are modeled using one-minute sampled spectral irradiance and reference cell temperature measurements. The model also incorporates spectral responsivity data for the reference cell. The transmission of light through the glazing multiplies the sum over all appropriate wavelengths of temperature adjusted reference cell responsivity times the measured spectral irradiance. Modeled reference cell output is compared with measured reference cell output under clear sky and totally cloudy sky conditions. For each reference cell the ratio of modeled to measured output varies by less than 2% over the year. © 2022 IEEE.

关键词： Light transmission

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A D-band Frequency-Doubling Distributed Amplifier Through Monolithic Integration of SiC SIW and GaN HEMTs

A D-band Frequency-Doubling Distributed Amplifier Through Mo...

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Asia-Pacific Conference on Microwave

作者： Lei Li Tianze Li Patrick Fay James C. M. Hwang School of Electrical & Computer Eng Cornell University Ithaca NY USA Department of Material Science & Eng Cornell University Ithaca NY USA Department of Elecctrical Engineering The University of Notre Dame Notre Dame IN USA

This is the first report of a distributed amplifier (DA) realized through monolithic integration of transistors with a substrate-integrated waveguide (SIW). The DA uses a stepped-impedance microstrip line as the input divider like in conventional DAs, but uses a low-loss, high-power-capacity SIW as the output combiner. The input signal is distributed to four GaN high-electron mobility transistors (HEMTs) evenly in magnitude but with the phase successively delayed by 90° at the fundamental frequency. The HEMTs are separated by a half wavelength at the second harmonic frequency in the SIW, so that their outputs are combined coherently at the SIW output. To overcome the limited speed of the GaN HEMTs, they are driven nonlinearly to generate second harmonics, and their fundamental outputs are suppressed with the SIW acting as a high-pass filter. The measured characteristics of the DA agree with that simulated at the small-signal level, but exceeds that simulated at the large-signal level. For example, under an input of 68 GHz and 10 dBm, the output at 136 GHz is 24-dB above the fundamental. Under an input of 68 GHz and 20 dBm, the output at 136 GHz is 14 dBm, with a conversion loss of 6 dB and a power consumption of 882 mW. This proof-of-principle demonstration opens the path to improving the gain, power and efficiency of DAs with higher-performance transistors and drive circuits. Although the demonstration is through monolithic integration, the approach is applicable to heterogeneous integration with the SIW and transistors fabricated on separate chips.

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Correction to: Scalable fabrication of wide-bandgap perovskites using green solvents for tandem solar cells (Nature Energy, (2024), 10.1038/s41560-024-01672-x)

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Nature Energy 2025年

作者： Duan, Chenyang Gao, Han Xiao, Ke Yeddu, Vishal Wang, Bo Lin, Renxing Sun, Hongfei Wu, Pu Ahmed, Yameen Bui, Anh Dinh Zheng, Xuntian Wang, Yurui Wen, Jin Wang, Yinke Ou, Wennan Liu, Chenshuaiyu Zhang, Yuhong Nguyen, Hieu Luo, Haowen Li, Ludong Liu, Ye Luo, Xin Saidaminov, Makhsud I. Tan, Hairen National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Frontiers Science Center for Critical Earth Material Cycling Nanjing University Nanjing China Co. Ltd Suzhou China Department of Chemistry University of Victoria VictoriaBC Canada Research School of Electrical Energy and Materials Engineering College of Engineering and Computer Science The Australian National University CanberraNSW Australia

Correction to: Nature Energyhttps://***/10.1038/s41560-024-01672-x, published online 15 November 2024. In the version of the article initially published, we mistakenly listed the environmental score for DMSO as 4 instead of the correct score of 5, based on the evaluation criteria outlined by CHEM21. This error, along with the transposition of the "NMP" and "DMPU" labels on the x axis, has been corrected in Fig. 1a, as seen below in Fig. 1. (Figure presented.) Original and corrected Fig. 1a. To ensure clarity and accuracy, we have revised our understanding of the combination rules for determining risk levels. Previously, our explanation might have been unclear or misleading to readers. To address this, we have included an excerpt from the CHEM21 solvent guide below, which provides a clear list of solvent risk levels and their ranking rules (Tables 1 and 2). (Table presented.) (Table presented.) CHEM21 solvent guide of "classical" solvents1 Ranking by default1 These two tables clearly illustrate the risk levels and comprehensive evaluation criteria for the solvents discussed in our article. To enhance reader understanding, we have also integrated this information into the corrected Fig. 1a, providing a visual representation of the risk levels associated with different solvents. Additionally, we have made two necessary revisions to the second paragraph of the article. The sentence "To address this challenge, the evaluation criteria outlined by CHEM21 offer a guide, categorizing solvents into four groups based on their impact on safety, health and environment10, namely recommended (no chemical incompatibility under process conditions), problematic (suitable for lab or kilo-scale lab use), hazardous (strong constraints on scale-up) and highly hazardous (solvents to be avoided even in the lab)" has been corrected to "To address this challenge, the evaluation criteria outlined by CHEM21 offer a guide, comprehensively categorizing solvents into three groups based on the

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Uncertainty Quantification with Invertible Neural Networks for Signal Integrity Applications

Uncertainty Quantification with Invertible Neural Networks f...

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International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)

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

ISBN: (纸本)9781665486347

We present a machine learning based tool to quantify uncertainty for prediction problems regarding signal integrity. Harnessing invertible neural networks, we convert the inverse posterior distribution given by the network to address uncertainty in frequency responses as a function of design space parameters. As an example, we consider a differential plated-through-hole via in package core and predict S-parameters from its geometrical properties. Results show 3.3 % normalized mean squared error when compared with responses from a fullwave EM simulator.

关键词： Solid modeling Uncertainty Three-dimensional displays Simulation Neural networks Predictive models Scattering parameters

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electrical breakdown and charge dynamics of Polyethylene terephthalate films

Electrical breakdown and charge dynamics of Polyethylene ter...

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Conference on electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Jierui Zhou Peinan Zhou Chao Wu Yifei Wang Yang Cao Department of Electrical and Computer Engineering University of Connecticut Storrs CT USA Electrical Insulation Research Center Institute of Materials Science University of Connecticut Storrs CT USA Department of Material Science Engineering University of Connecticut Storrs CT USA

ISBN: (数字)9781665467957

ISBN: (纸本)9781665467964

Polyethylene terephthalate (PET) films have been used widely for capacitor application due to the high dielectric strength and low conduction loss. In this paper, we experimentally investigated the charge dynamics under the triangular voltage and temperature-dependent (TD) conduction of PET films up to the electrical breakdown using a specially designed conduction measurement setup. The charge dynamics in PET during transient voltage ramps as revealed by this setup provide implications of carrier transport with high mobility. In addition, the pre-breakdown conduction shows explicit space-charge-limited current features. The breakdown strength is stable in the temperature range from 25 to 100 °C and follows the derating process above 100°C. Also, a turning point is observed around the glass transition temperature for the nonlinear conduction onset field of PET films. The understanding of charged carrier behaviors at high electric fields can provide insights into the breakdown mechanism of dielectrics and the exploration of high-performance polymers.

关键词： Temperature measurement Voltage measurement Polyethylene Electric breakdown Films Glass Charge carrier processes

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Tunable phononic coupling in excitonic quantum emitters

arXiv

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arXiv 2023年

作者： Ripin, Adina Peng, Ruoming Zhang, Xiaowei Chakravarthi, Srivatsa He, Minhao Xu, Xiaodong Fu, Kai-Mei Cao, Ting Li, Mo Department of Physics University of Washington SeattleWA98195 United States Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States Department of Material Science and Engineering University of Washington SeattleWA98195 United States

engineering the coupling between fundamental quantum excitations is at the heart of quantum science and technologies. A significant case is the creation of quantum light sources in which coupling between single photons and phonons can be controlled and harnessed to enable quantum information transduction. Here, we report the deterministic creation of quantum emitters featuring highly tunable coupling between excitons and phonons. The quantum emitters are formed in strain-induced quantum dots created in homobilayer semiconductor WSe2. The colocalization of quantum confined interlayer excitons and THz interlayer breathing mode phonons, which directly modulate the exciton energy, leads to a uniquely strong phonon coupling to single-photon emission. The single-photon spectrum of interlayer exciton emission features a single-photon purity >83% and multiple phonon replicas, each heralding the creation of a phonon Fock state in the quantum emitter. Owing to the vertical dipole moment of the interlayer exciton, the phonon-photon interaction is electrically tunable in a wide range, promising to reach the strong coupling regime. Our result demonstrates a new type of solid-state quantum excitonic-optomechanical system at the atomic interface that emits flying photonic qubits coupled with stationary phonons, which could be exploited for quantum transduction and interconnection. © 2023, CC BY.

关键词： Phonons

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Monofacial vs Bifacial Solar Photovoltaic Systems in Snowy Environments

SSRN

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SSRN 2022年

作者： Hayibo, Koami Soulemane Petsiuk, Aliaksei Mayville, Pierce Brown, Laura Pearce, Joshua M. Department of Electrical & Computer Engineering Western University Canada Department of Material Science & Engineering Michigan Technological University United States Department of Computer Science Michigan Technological University United States Ivey Business School Western University Canada

There has been a recent surge in interest in the more accurate snow loss estimates for solar photovoltaic (PV) systems as large-scale deployments move into northern latitudes. Preliminary results show bifacial modules may clear snow faster than monofacial PV. This study analyzes snow losses on these two types of systems using empirical hourly data including energy, solar irradiation and albedo, and open-source image processing methods from images of the arrays in a northern environment in the winter. Projection transformations based on reference anchor points and snowless ground truth images provide reliable masking and optical distortion correction with fixed surveillance cameras. This allows individual PV module-level snow shedding ratio determination as well as average cumulative snow load by employing grayscale segmentation. The data is used to determine the no-snow losses of two systems during summer and snow losses during winter. The results found monofacial snow losses are in average 33% for winter period, and 16% on an annual basis. Bifacial systems perform better than monofacial in severe winter conditions as average winter snow losses was 16% and the annual losses were 2% in the worst-case scenario. In addition, there was a bifacial gain of 19% compared to monofacial system during winter. © 2022, The Authors. All rights reserved.

关键词： Solar power generation

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Synthesis and Characterization of Platinum on Carbon Nanoparticles Selectively Coated with Titanium Nitride (TiN) 240

Synthesis and Characterization of Platinum on Carbon Nanopar...

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240th ECS Meeting

作者： O. Godoy, Andres Ilhom, Saidjafarzoda Kattan, Mor Zarama, Pablo Ein-Eli, Yair Biyikli, Necmi Jankovic, Jasna Institute of Materials Science University of Connecticut Storrs United States Center for Clean Energy Engineering University of Connecticut Storrs United States Department of Electrical and Computer Engineering University of Connecticut Storrs United States Department of Material Science and Engineering Technion - Israel Institute of Technology Haifa Israel

ISBN: (纸本)9781607685395

Here we propose a novel way to prevent the insidious effect of carbon corrosion in a Proton Exchange Membrane Fuel Cell (PEMFC) by depositing a corrosion-resistant layer (∼1.5 nm thick) of Titanium Nitride (TiN) on the carbon substrate of platinum on carbon (Pt/C) catalyst (in powder state), leaving the Pt catalyst centers uncoated and accessible for reagents reactions (oxygen O2 and H+ protons). The deposition was carried out at 150 C with a Hollow-Cathode Plasma-Assisted Atomic Layer Deposition (HCPA-ALD) using Tetrakis(dimethylamino)titanium (IV) (TDMAT) as the metal precursor in Ar/N2 plasma, from which nitrogen was used as co-reactant. Additionally, Transmission Electron Microscopy (TEM) characterization allowed us to prove the successful formation of a homogenous coating on these nanoparticles and electrochemical characterization performed with a Rotating Disc Electrode (RDE) further confirmed the activity and effectiveness of our designed catalyst. Preliminary results have shown that highly conformal TiN can be successfully grown onto Pt/C nanoparticles by using HCPA-ALD with a custom-made agitator mechanism. © 2021 ECS - The Electrochemical Society.

关键词： Titanium nitride

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Improved accuracy in quantification of analyte through dual modality multisite sensing 21

Improved accuracy in quantification of analyte through dual ...

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21st International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2017

作者： Sardar, Sakshi Fabris, Laura Javanmard, Mehdi Department of Electrical and Computer Engineering Rutgers University United States Material Science and Engineering Rutgers University United States

ISBN: (纸本)9780692941836

We introduce a technique, which results in 10X improvement in precision of surface enhanced Raman spectroscopy measurements, by combining dual Raman/Electrochemical measurements, at multiple sites with induced diversity. We carried out our experiments at fixed analyte concentrations while varying nanoparticle concentrations. Each concentration of nanoparticles gave rise to different Raman signal intensities, thus providing a three-point matrix to confirm the analyte concentration. © 17CBMS-0001.

关键词： Nanoparticles

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