Article
Computer Science, Information Systems
Jianfeng Li, Xiaoyan Huang
Summary: This paper proposes a dual circular polarization Fabry-Perot resonant antenna, which consists of a microstrip antenna radiator and a meta-surface. The meta-surface is used to generate two circularly polarized beams in the design of a Fabry-Perot resonant cavity. By rotating the top C-gaps to form prescribed phase gradients, the proposed design splits an LP wave from the feed into left-hand CP and right-hand CP waves. Simulation and measurement results demonstrate that the proposed antenna is capable of generating stable left-hand CP and right-hand CP radiation beams with high gain and aperture efficiency at a specific frequency. This technique provides an efficient way to achieve FP resonant antennas with specific characteristics using meta-surfaces for advanced functionalities.
Article
Chemistry, Multidisciplinary
Zhiwei Li, Yugang Zeng, Yue Song, Jianwei Zhang, Yinli Zhou, Yongqiang Ning, Li Qin, Lijun Wang
Summary: This study investigated the effect of substrate misorientation on the crystal quality, structural properties, and optical properties of InGaAs/GaAsP single quantum wells. Results revealed that different misorientation angles led to variations in lattice relaxation and optical properties of the quantum wells. The experimental findings proposed a mechanism explaining the impact of substrate miscuts on the structural and optical properties of quantum wells.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Multidisciplinary
Zhao Xin-Wei, Lu Jun-Peng, Ni Zhen-Hua
Summary: With the post-Moore era, the application of semiconductor micro-nano lasers is shifting towards photonic integration, with various semiconductor materials rapidly advancing the field. Perovskite materials, such as lead halide perovskites, show promising optical properties, making them excellent candidate materials for high-gain, low-threshold semiconductor micro-nano lasers. The Fabry-Perot resonator laser, a type of perovskite laser, has been extensively researched due to its simple structure and high application value.
ACTA PHYSICA SINICA
(2021)
Article
Materials Science, Multidisciplinary
Maui Hino, Meita Asami, Kentaroh Watanabe, Yoshiaki Nakano, Masakazu Sugiyama
Summary: The influence of GaAs interlayer thickness on the radiative efficiency of InGaAs/GaAsP multiple quantum wells (MQWs) is investigated. The results show that inserting a thicker GaAs interlayer below the InGaAs enhances the radiative efficiency, while a GaAs interlayer above the InGaAs must be thicker than approximately 6 nm to enhance the radiative efficiency.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Xiaonan Zhao, Xuqiang Wu, Cheng Zuo, Shengquan Mu, Wujun Zhang, Jinhui Shi, Lei Gui, Dong Guang, Benli Yu
Summary: A novel miniature Fabry-Perot strain probe based on anti-resonant hollow core fiber (ARHCF) is proposed and experimentally demonstrated. The probe consists of an ARHCF sandwiched between a single-mode fiber (SMF) and a multi-mode fiber (MMF), with two fusion points of the fibers serving as mirrors for a Fabry-Perot interferometer (FPI). The experimental results show good agreement with simulation results. The ARHCF provides high-resolution reflection spectra even when the air hole collapses during fiber fusion. By utilizing the insensitivity of the ARHCF to temperature and refractive index, the FPI can be made small enough to work in tight spaces with high temperature and humidity, providing new strategies and ideas for the development of strain sensors.
Article
Optics
Marina Yakovleva, Jean-Luc Pelouard, Fabrice Pardo
Summary: In this article, it is shown that Lorentz invariant lines, called electric spaghettis (ESs), can be constructed in a system with longitudinal invariance and p-polarized electromagnetic field. These lines transcend the limit between space and time. Different ES patterns are observed in a Fabry-Perot resonant slit grating.
Article
Optics
Zhicheng Zhang, Yao Xiao, Jun Wang, Pei Miao, Heng Liu, Yang Cheng, Yudan Gou, Sha Wang, Guoliang Deng, Shouhuan Zhou
Summary: In this study, a multi-watt emitting VECSEL based on InGaAs/GaAs quantum-wells (QWs) with a wavelength beyond 1200 nm is successfully demonstrated. The research is significant for high-performance 1200 nm laser sources in the field of C-H bond photoacoustic tomography and atmospheric transmission.
JOURNAL OF LUMINESCENCE
(2023)
Article
Nanoscience & Nanotechnology
Veronica Letka, Mickael Martin, Natalia Massara, Charles Leroux, Roselyne Templier, Christophe Licitra, Jerome Richy, Thierry Baron
Summary: This paper presents a method to integrate III-V materials into cheap and ubiquitous Si-based technologies by addressing the lattice constant mismatch. It introduces a near-infrared resonant cavity-enhanced photodetector (RCE PD) integrated onto a Si(001) substrate, which includes a thin InGaAs/GaAsP strained-layer superlattice and GaAs/AlGaAs distributed Bragg reflectors. The device achieves 13-21% internal quantum efficiency, which can be further improved by adding more distributed Bragg reflectors or other reflectors.
Article
Physics, Multidisciplinary
Mohammad Eskandari, Alireza Shamsi
Summary: This paper investigates the utilization of photonic and plasmonic modes to enhance the absorption of ultrathin film Si Solar Cells. Simulation results show that these mechanisms significantly improve the cell's absorption. Au nanoparticles with different radii are used on the front surface of the cell to explore plasmonic effects and take advantage of the optical properties of localized surface plasmons (LSPs). The use of Au NPs with radii of 25, 50, and 75 nm simultaneously increases the absorption dramatically. Cu NPs are employed on the backside of the cell to enhance absorption in the near-IR region. The achieved performance improvement of ultra-thin film solar cells promises increased application potential in solar energy harvesting.
Article
Optics
Sina Foroutan-Barenji, Onur Erdem, Savas Delikanli, Huseyin Bilge Yagci, Negar Gheshlaghi, Yemliha Altintas, Hilmi Volkan Demir
Summary: This study demonstrates the fabrication of vertically-cavity surface emitting lasers using a self-assembly method and achieving single-mode lasing from thin colloidal gain media under femtosecond optical excitation. Through specially engineered CQWs and vertical cavity modeling, the accurate spectral and spatial alignment of the cavity mode with the CQW films was secured, overcoming the limited electrical conductivity in thicker colloidal films.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Weicheng Dai, Haozhu Wang, Long Jin, Chang Liu, Yuan Dong, Guangyong Jin
Summary: A rate equation theoretical model is created for a continuous-wave end-pumped Pr3+:YLF single-longitudinal-mode (SLM) green laser. By inserting two Fabry-Perot etalons into the cavity, a single-longitudinal-mode green laser is generated, with a maximum output power of 183 mW and maximum absorbed pump power of 6.2 W. The corresponding linewidth is approximately 18 MHz. This work presents a simple method for generating a single-longitudinal-mode laser in the green spectral region, providing a practical approach for various green-laser-related applications.
Article
Chemistry, Multidisciplinary
Viktor Shamakhov, Sergey Slipchenko, Dmitriy Nikolaev, Alexander Smirnov, Ilya Eliseyev, Artyom Grishin, Matvei Kondratov, Ilya Shashkin, Nikita Pikhtin
Summary: In this study, we used the selective-area-epitaxy technique to fabricate and study samples of semiconductor heterostructures that contain highly strained InGaAs quantum wells. The composition and emission wavelength of the quantum wells varied across the window due to the curvature profile of the growth surface. Increasing the curvature profile led to a transition in the photoluminescence wavelength distribution profile.
Article
Chemistry, Physical
Feilong Pan, Mei Luo, Xuncheng Liu, Haiying Jiang, Zhen Wang, Dong Yuan, Qian Wang, Lechi Qing, Zesheng Zhang, Lianjie Zhang, Yingping Zou, Junwu Chen
Summary: This study proposes a solution to the thickness-sensitive fill factor (FF) issue in thick-film polymer solar cells by pairing high-hole mobility polymer donor Si25 with benzotriazole-fused Y-series non-fullerene acceptor Y14. The combined films showed higher electron mobility values and balanced charge transport, leading to improved PSCs performance with reduced FF decay. The results suggest that high mu(h) polymers and benzotriazole-fused Y-series non-fullerene acceptors are promising candidates to overcome the thickness sensitivity of FF.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Engineering, Electrical & Electronic
Yi-Di Hu, Xiao-Hua Wang, Shi-Wei Qu, Bing-Zhong Wang
Summary: This letter proposes a new method for designing multilayer printed partially reflective surfaces (PRS) to achieve broadband, high efficiency, and miniaturization of Fabry-Perot resonant antennas (FPRA). By considering every two-layer structure as a resonator, a narrowband positive reflection phase gradient is obtained and then cascaded to achieve broadband. Finally, a three-layer PRS is designed and integrated to form a compact FPRA with a wide impedance bandwidth.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Faten Adel Ismael Chaqmaqchee
Summary: InGaAs/GaAsP based quantum well vertical cavity surface emitting lasers (VCSELs) operating in 980 nm are attractive for optical interconnect applications due to their low cost and power consumption. The study focuses on the thermal stability of the devices in high temperature short-reach optical links, and the experimental results demonstrate a maximum small-signal modulation bandwidth exceeding 22 gigahertz at an ambient temperature of 25 degrees Celsius.
JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Arthur Julien, Jean-Baptiste Puel, Jean-Francois Guillemoles
Summary: A novel simulation method is used to identify the mechanisms responsible for the degradation of perovskite solar cells. Experimental data is compared to simulated pathways in order to determine the dominant cause of performance losses and provide insights for stability improvements.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Energy & Fuels
Bernice Mae Yu Jeco-Espaldon, Ryo Tamaki, Maxime Giteau, Hao Xu, Nazmul Ahsan, Richard R. King, Yoshitaka Okada
Summary: Perimeter recombination is one of the causes for the nonuniform luminescent coupling effect in III-V multijunction solar cells. Electrical passivation of the multijunction solar cell perimeter can significantly improve current collection and homogeneity, resulting in an increase in absolute conversion efficiency.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Energy & Fuels
Meita Asami, Kentaroh Watanabe, Riko Yokota, Yoshiaki Nakano, Masakazu Sugiyama
Summary: This study compares the advantages and disadvantages of different methods for evaluating the performance of solar cells based on voltage loss. It proposes a method to accurately evaluate the nonradiative voltage loss in quantum-structure solar cells.
IEEE JOURNAL OF PHOTOVOLTAICS
(2023)
Article
Chemistry, Physical
Chunyang Dong, Di Hu, Karima Ben Tayeb, Pardis Simon, Ahmed Addad, Martine Trentesaux, Danilo Oliveira de Souza, Sergei Chernyak, Deizi V. Peron, Amelle Rebai, Jean-Francois Guillemoles, Xavier Wallart, Bruno Grandidier, Andrei Y. Khodakov, Negar Naghavi, Vitaly V. Ordomsky
Summary: Selective methane photocatalytic oxidation to CO and H2 at ambient conditions is a main challenge in the chemical industry. In this study, conventional Cu (In,Ga)Se2 (CIGS) absorbers used in solar cells were found to be excellent candidates for methane valorization. A thin film of CIGS coated over Mo demonstrated exceptional performance in methane partial oxidation to CO and H2, with a stable CO productivity of 2.4 mmol per gram of CIGS and a selectivity to CO of over 80%.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Physics, Applied
Gan Li, Hassanet Sodabanlu, Kentaroh Watanabe, Masakazu Sugiyama, Yoshiaki Nakano
Summary: A temperature-graded layer of AlGaAs can solve the issue of growth temperature mismatch and significantly improve the voltage performance of AlGaAs/InGaP solar cells. The temperature-graded growth provides a scalable method for AlGaAs-based heterogeneous growth.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Silvia Tacchi, Jorge Flores-Farias, Daniela Petti, Felipe Brevis, Andrea Cattoni, Giuseppe Scaramuzzi, Davide Girardi, David Cortes-Ortuno, Rodolfo A. Gallardo, Edoardo Albisetti, Giovanni Carlotti, Pedro Landeros
Summary: The band diagram of a chiral magnonic crystal composed of a ferromagnetic film and an array of heavy-metal nanowires with periodic Dzyaloshinskii-Moriya coupling is studied. Experimental evidence shows strong asymmetry of spin wave amplitude induced by modulated interfacial Dzyaloshinskii-Moriya interaction, resulting in nonreciprocal propagation. Flat spin-wave bands are observed at low frequencies in the band diagram. Depending on the perpendicular anisotropy, the spin-wave localization associated with the flat modes can occur in zones with or without Dzyaloshinskii-Moriya interaction.
Article
Multidisciplinary Sciences
Yongjie Zou, Hamidreza Esmaielpour, Daniel Suchet, Jean-Francois Guillemoles, Stephen M. M. Goodnick
Summary: Under continuous-wave laser excitation, the carrier temperature in a lattice-matched MQW structure exhibits a faster rise for 405 nm compared to 980 nm excitation, as the injected carrier density increases. The dominant factor for this temperature rise is nonequilibrium LO phonon effects, with the Pauli exclusion playing a significant role at high carrier densities. Additionally, the study reveals the presence of carriers in satellite L-valleys due to strong intervalley transfer during 405 nm excitation, resulting in a cooler steady-state electron temperature in the central valley. This research enhances our understanding of hot carrier dynamics in semiconductors and can be applied to reduce energy loss in solar cells.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Aleksandra Bojar, Daniel Micha, Maxime Giteau, Marco A. Ruiz-Preciado, Ulrich W. Paetzold, Marcel Simor, Veronique S. Gevaerts, Romain Carron, Karim Medjoubi, Stephane Collin, Negar Naghavi, Jean-Francois Guillemoles, Philip Schulz
Summary: In this study, the transfer matrix method is used to analyze the optical properties of different solar cell devices based on CI(G)S and PVK absorbers. By fitting experimental data and performing an optical loss analysis, we identified sources of parasitic absorption and suggested substitute materials for better efficiency. Our findings provide guidelines for the development of monolithic PVK/CI(G)S tandem solar cells, with a predicted achievable efficiency of 30%.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Guillaume Vidon, Pia Dally, Mirella Al-Katrib, Daniel Ory, Minjin Kim, Etienne Soret, Eva Rangayen, Marie Legrand, Alexandre Blaizot, Philip Schulz, Jean-Baptiste Puel, Daniel Suchet, Jean-Francois Guillemoles, Arnaud Etcheberry, Muriel Bouttemy, Stefania Cacovich
Summary: Understanding the effects of X-rays on halide perovskite thin films is crucial for accurate characterization and practical usage of these materials in detection systems. This study utilizes advanced optical imaging techniques to comprehensively understand the degradation mechanism occurring in the material during photoemission spectroscopy measurements. The findings highlight the impact of X-rays on the perovskite layers, providing valuable insights for investigations using X-ray based techniques and the development of perovskite-based X-ray detectors and solar cells for space applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ryoya Tsuchida, Kentaroh Watanabe, Meita Asami, Yoshiaki Nakano, Masakazu Sugiyama
Summary: A simple method using block copolymers to fabricate light-scattering textured structures has been developed in this study. By inserting this structure into the rear side of ultrathin GaAs solar cells, the photoabsorption is enhanced, resulting in improved energy conversion efficiency.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Meita Asami, Henner Kampwerth, Michael Pollard, Xiaojing Hao, Shintaro Komaba, Tetsuo Ikari, Atsuhiko Fukuyama, Kentaroh Watanabe, Yoshiaki Nakano, Masakazu Sugiyama
Summary: This study investigates a method for measuring light absorption using photothermal deflection spectroscopy (PDS) and proposes a novel calculation method for accurate PDS absorption measurements. By fabricating a sample with quantum structures and performing PDS measurements, exciton absorption peaks are observed and confirmed using other photothermal measurements. The results demonstrate that the new PDS absorption measurement technique enables accurate absorption characteristics.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Energy & Fuels
Adele Debono, Hortense L'Hostis, Amelle Rebai, Erlind Mysliu, Inger Odnevall, Nathanaelle Schneider, Jean-Francois Guillemoles, Andreas Erbe, Polina Volovitch
Summary: This study investigates the stability of the interfaces between molybdenum back contact and CIGS absorber layers in CIGS-based solar cells. The results indicate that the molybdenum layer degrades through oxidation when exposed to humidity and temperature variations as well as atmospheric pollution, while the CIGS layer is less affected.
PROGRESS IN PHOTOVOLTAICS
(2023)
Article
Chemistry, Physical
Salim Mejaouri, Stefania Cacovich, Philippe Baranek, Baptiste Berenguier, Iwan Zimmermann, Armelle Yaiche, Dominique Loisnard, Jean Rousset, Stephane Collin
Summary: Moisture induces changes in the performance and stability of lead halide perovskite solar cells by altering the nature of the absorber through phase transition or segregation. Understanding the material's evolution in wet environments is crucial for optimizing device performance. Analyzing the degradation products and their optical and chemical properties provides insights into the degradation mechanisms and potential for improving stability.
Article
Materials Science, Multidisciplinary
Maui Hino, Meita Asami, Kentaroh Watanabe, Yoshiaki Nakano, Masakazu Sugiyama
Summary: This study investigates the influence of the V/III ratio on the radiative efficiency (eta rad) of indium gallium phosphide (InGaP) multiple quantum well (MQW) structures. The eta rad increases with increasing V/III ratio. However, the eta rad degrades at excessively high V/III ratios. It is found that inserting an InGaP MQW grown under an appropriate V/III ratio improves the InGaP solar cell performance.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
