Frontiers in photonics最新文献_第9页

Optical Simulation Study of Perovskite/CIGS Tandem Solar Cells With Reduced Graphene Oxide Layers 还原氧化石墨烯层钙钛矿/CIGS串联太阳能电池的光学模拟研究

Frontiers in photonics Pub Date : 2022-05-04 DOI: 10.3389/fphot.2022.888486

M. Kovačič, J. Krč, K. Savva, S. Maragkaki, E. Stratakis, Mudasar Rashid, Merve Tutundzic, Y. Kuang, J. de Wild, Tom Aernouts, B. Vermang, M. Topič

{"title":"Optical Simulation Study of Perovskite/CIGS Tandem Solar Cells With Reduced Graphene Oxide Layers","authors":"M. Kovačič, J. Krč, K. Savva, S. Maragkaki, E. Stratakis, Mudasar Rashid, Merve Tutundzic, Y. Kuang, J. de Wild, Tom Aernouts, B. Vermang, M. Topič","doi":"10.3389/fphot.2022.888486","DOIUrl":"https://doi.org/10.3389/fphot.2022.888486","url":null,"abstract":"Tandem solar cells present a promising solution to overcome the Schottky–Queisser efficiency limit of single-junction solar cells. In this article, an all–thin-film tandem solar cell based on perovskite (PK) top cell and chalcopyrite Cu (In, Ga) Se2 (CIGS) bottom cell is researched. Device optical simulations are validated on the top and bottom cells and employed for the analysis of PK/CIGS tandem cells. In particular, the optical effects of introduced laser reduced graphene oxide (rGO) layers at two positions in the tandem cell: 1) at the position between the top PK and bottom CIGS cell and 2) underneath the front transparent electrode. The purpose of introducing rGO layers is to improve the optoelectrical properties of the device, based on the tunable electronic and optical characteristics of rGO layers. Optical simulation results show that the parasitic absorption in rGO layers may noticeably affect the optical performance of the tandem cell if the layers are not optimized. The use of a thin and a few nanometer-thick rGO is suggested from the analysis if its parasitic absorption is not reduced. Directions for further optimization of optical rGO, including the reduction of parasitic absorption and tuning of the real part of the refractive index, are performed.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41595177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-Vivo Imaging of Ocular Microvasculature Using Swept-Source Optical Coherence Tomography Angiography in Seven Types of Lab Animals 用扫描源光学相干断层扫描对七种实验动物的眼部微血管系统进行体内成像

Frontiers in photonics Pub Date : 2022-04-26 DOI: 10.3389/fphot.2022.867594

Xuan Wu, Jacqueline Chua, C. Ho, X. Yao, A. R. Muralidharan, R. Najjar, G. Tan, E. Tamm, L. Schmetterer, V. Barathi, Bingyao Tan

{"title":"In-Vivo Imaging of Ocular Microvasculature Using Swept-Source Optical Coherence Tomography Angiography in Seven Types of Lab Animals","authors":"Xuan Wu, Jacqueline Chua, C. Ho, X. Yao, A. R. Muralidharan, R. Najjar, G. Tan, E. Tamm, L. Schmetterer, V. Barathi, Bingyao Tan","doi":"10.3389/fphot.2022.867594","DOIUrl":"https://doi.org/10.3389/fphot.2022.867594","url":null,"abstract":"The purpose of this study is to characterize the retinal and choroidal vascular networks in some of the most common animal species using swept-source optical coherence tomography angiography (SS-OCTA). Retinal angiographic images were acquired from healthy, anesthetized animals of seven species (mouse, rat, pig, rabbit, guinea pig, chicken, and non-human primate). We generated the enface angiograms to visualize the different retinal vascular plexuses and the choroidal vascular plexus. Quantitative OCTA metrics, including perfusion density, vessel density, and fractal dimension, were compared amongst the different species. There was a noticeable difference in the OCTA enface maps of the distinct vascular layers amongst the various species. Specifically, the non-human primate retina has the highest level of perfusion density and vessel density, whereas the rabbit retina exhibited the lowest level of vessel density. The mouse and the rat retina shared similar vascular patterns, and there was no difference in the OCTA metrics. Using one specific SS-OCTA system for all experiments eliminated multiple instrument-dependent factors, but the lateral resolution was still affected by eye size. Effects of varying lateral resolution on vascular metrics were investigated via a simulation. Overall, we achieved a large field of view of the distinct retinal and choroidal vascular plexuses and quantified the vascular metrics in multiple species, which could serve as protocol guidance and atlas to study the retinal and choroidal vascular abnormalities and their roles in ocular diseases resembling in-vivo histology.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44101273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transverse Traveling-Wave and Standing-Wave Ray-Wave Geometric Beams 横向行波和驻波射线波几何光束

Frontiers in photonics Pub Date : 2022-04-25 DOI: 10.3389/fphot.2022.855214

Zhaoyang Wang, Ruilin Long, Zhensong Wan, Zijian Shi, Xinjie Liu, Qiang Liu, X. Fu

引用次数: 1

A Survey for 3D Flame Chemiluminescence Tomography: Theory, Algorithms, and Applications (Invited) 三维火焰化学发光层析成像:理论、算法和应用(特邀)

Frontiers in photonics Pub Date : 2022-03-29 DOI: 10.3389/fphot.2022.845971

Ying Jin, G. Situ

{"title":"A Survey for 3D Flame Chemiluminescence Tomography: Theory, Algorithms, and Applications (Invited)","authors":"Ying Jin, G. Situ","doi":"10.3389/fphot.2022.845971","DOIUrl":"https://doi.org/10.3389/fphot.2022.845971","url":null,"abstract":"Combustion diagnostics play an essential role in energy engineering, transportation, and aerospace industries, which has great potential in combustion efficiency improvement and polluting emission control. The three-dimensional (3D) visualization of the combustion field and the measurement of key physical parameters such as temperature, species concentration, and velocity during the combustion process are important topics in the field of combustion diagnostics. Benefiting from the non-contact and non-intrusive advantages of the optical detection method as well as the advantages of the 3D full-field measurement of the measured field by computational tomography, flame chemiluminescence tomography (FCT) has the ability to realize non-intrusive and instantaneous 3D quantitative measurement and 3D full-field visualization of key physical parameters in the combustion process, which has crucial research significance in combustion diagnostics. In this study, we review the progress of FCT technique. First, we provide an extensive review of practical applications of FCT in state-of-the-art combustion diagnostics and research. Then, the basic concepts and mathematical theory of FCT are elaborated. Finally, we introduce the conventional reconstruction algorithm and proceed to more popular artificial intelligence-based algorithms.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45872838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a Fringe Printer With 0.35 μm Pixel Pitch 0.35 μm像素间距条纹打印机的研制

Frontiers in photonics Pub Date : 2022-03-28 DOI: 10.3389/fphot.2022.843860

Takeshi Yamaguchi, H. Yoshikawa

{"title":"Development of a Fringe Printer With 0.35 μm Pixel Pitch","authors":"Takeshi Yamaguchi, H. Yoshikawa","doi":"10.3389/fphot.2022.843860","DOIUrl":"https://doi.org/10.3389/fphot.2022.843860","url":null,"abstract":"The development of computational devices can provide computer-generated holograms (CGH) of over 100 Giga-pixel easily. The performance improvement of the graphical processing unit makes calculations faster with a normal personal computer. In contrast, the output device of CGH is not reported much. Since CGH is a fringe pattern, high resolution and fine pixel pitch are required for the output device. We have been developing a direct fringe printer, which consists of a laser, an X-Y stage, an SLM, and optical parts available on the market. Our previous report presented a liquid crystal panel, which was used for SLM that had full HD resolution and 7 μm pixel pitch. Since the Pixel pitch of the liquid crystal panel is not small enough for CGH, the optical setup works to demagnify the pixel pitch of the printed fringe pattern. To record high resolution CGH, the calculated fringe pattern is split and exposed in tiles by the X–Y stage. The results showed a 0.44 μm pixel pitch and over 100 Gpixel CGHs. However, to output more high-quality CGH, the development of pixel pitch and resolution is very important. In this paper, we review the optical system of a fringe printer that achieved an output of 0.35 μm pixel pitch CGH. We also investigate the performance of the new fringe printer.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46626290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deep-Learning Computational Holography: A Review (Invited) 深度学习计算全息:综述(特邀)

Frontiers in photonics Pub Date : 2022-03-28 DOI: 10.3389/fphot.2022.854391

T. Shimobaba, David Blinder, Tobias Birnbaum, I. Hoshi, Harutaka Shiomi, P. Schelkens, T. Ito

引用次数: 22

A Multi-Wavelength Phase Retrieval With Multi-Strategy for Lensfree On-Chip Holography 基于多策略的无透镜片上全息多波长相位恢复

Frontiers in photonics Pub Date : 2022-03-28 DOI: 10.3389/fphot.2022.865666

Qinhua Wang, Jianshe Ma, Ping Su

引用次数: 1

Frontiers in Photonics Spot Light 光子学前沿聚光灯

Frontiers in photonics Pub Date : 2022-03-09 DOI: 10.3389/fphot.2022.853456

Bahman Anvari, C. de Angelis, Shujuan Huang, N. Litchinitser, T. Poon, G. Scalari, B. Richards, M. Peccianti

引用次数: 0

Compressive Interferenceless Coded Aperture Correlation Holography With High Imaging Quality (Invited) 高成像质量压缩无干涉编码孔径相关全息术（受邀）

Frontiers in photonics Pub Date : 2022-03-04 DOI: 10.3389/fphot.2022.846731

Chao Liu, Tianlong Man, Yuhong Wan

{"title":"Compressive Interferenceless Coded Aperture Correlation Holography With High Imaging Quality (Invited)","authors":"Chao Liu, Tianlong Man, Yuhong Wan","doi":"10.3389/fphot.2022.846731","DOIUrl":"https://doi.org/10.3389/fphot.2022.846731","url":null,"abstract":"Interferenceless coded aperture correlation holography (I-COACH) provides an alternative way for the 3D imaging of spatial incoherent illuminated or fluorescent sample. However, the low imaging signal-to-noise ratio (SNR) is one of the bottlenecks that restrict the application of I-COACH. The limitation is mainly originated from the strong bias level that presents in the recorded holograms. Phase shifting methods were implemented in I-COACH to eliminate the background noise while the multiple-exposures recording mechanism significantly reduces the temporal resolution of the system. In this paper, we proposed a compressive I-COACH imaging method with high reconstruction quality and without the sacrifice of the imaging speed. The 3D holographic image reconstruction was implemented under compressive sensing framework while only one single-exposure object hologram and one point spread hologram are necessary. High quality reconstructions were obtained using the proposed method, even for the down-sampled holograms. The imaging SNR of the I-COACH system was improved by a factor of more than 16.5% when comparing with the imaging SNR obtained by the conventional cross-correlation reconstruction method. The proposed method provides a fast and high-fidelity imaging method that can potentially benefit the imaging through scattering medium, partial aperture imaging, and other fields.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41399541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Efficient Low Threshold Frequency Conversion in AlGaAs-On-Insulator Waveguides AlGaAs绝缘体上波导的高效低阈值频率转换

Frontiers in photonics Pub Date : 2022-03-04 DOI: 10.3389/fphot.2022.904651

Emil Z. Ulsig, I. Degli-Eredi, E. Stanton, N. Volet

引用次数: 1