Yunxi Dong, Bowen Zheng, Fan Yang, Hong Tang, Huan Zhao, Yi Huang, Tian Gu, Juejun Hu, Hualiang Zhang
{"title":"Full-Color, Wide Field-of-View Metalens Imaging via Deep Learning","authors":"Yunxi Dong, Bowen Zheng, Fan Yang, Hong Tang, Huan Zhao, Yi Huang, Tian Gu, Juejun Hu, Hualiang Zhang","doi":"10.1002/adom.202402207","DOIUrl":"https://doi.org/10.1002/adom.202402207","url":null,"abstract":"<p>Chromatic aberration has been the main showstopper for metalenses when it comes to imaging applications with broadband sources such as ambient light. In wide field-of-view metalenses, this challenge becomes far more severe due to exacerbated lateral chromatic aberrations. In this paper, it is demonstrated, for the first time, full-color wide field-of-view imaging using a fisheye metalens coupled with deep learning computational processing. This approach is capable of restoring panoramic images with enhanced signal-to-noise ratio while effectively correcting chromatic aberration, distortion, and vignetting. Furthermore, it is shown that the deep learning algorithm is robust against various lighting conditions and object distances, making it a versatile solution for practical imaging applications involving wide field-of-view metalenses.</p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"13 3","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202402207","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Andrea Tognazzi, Paolo Franceschini, Helena Weigand, Ülle-Linda Talts, Alfonso Carmelo Cino, Rachel Grange, Costantino De Angelis
{"title":"A Simplified Model for Polycrystalline BaTiO3 Nanoresonator for Second Harmonic Generation","authors":"Andrea Tognazzi, Paolo Franceschini, Helena Weigand, Ülle-Linda Talts, Alfonso Carmelo Cino, Rachel Grange, Costantino De Angelis","doi":"10.1002/adom.202402484","DOIUrl":"https://doi.org/10.1002/adom.202402484","url":null,"abstract":"<p>Second Harmonic Generation (SHG) has become a critical technique in material characterization, image processing and microscopy. While bulk crystals have been traditionally used for SHG due to their high conversion efficiencies, limited control over radiation properties, delicate phase-matching conditions and alignment pose significant challenges. The exploration of nanoscale materials and structures based on dielectric platforms has provided enhanced SHG efficiency and control, but their limited transparency in the visible spectral range and complex fabrication processes hinder broader application. Barium titanate (BaTiO<sub>3</sub>), a ferroelectric material with spontaneous polarization and nonlinear optical behavior, presents an attractive alternative due to its suitability for nano-imprinting techniques, facilitating scalable production of metasurfaces. In this study, SHG from single polycrystalline BaTiO<sub>3</sub> nanocylinders is investigated. Through polarization-dependent experiments, the influence of crystalline domain orientation and arrangements within the nanocylinders on SHG efficiency is characterized. A simplified numerical model to interpret the different polarization-dependent SHG diagrams obtained from nominally identical nanocylinders is developed. The results reveal the significant impact of domain geometry and relative size on SHG characteristics. By understanding the relationship between domain geometry and SHG giving insights into the material characterization and design optimization of BaTiO<sub>3</sub> and other polycrystalline nanostructures in nonlinear optical devices.</p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"13 5","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202402484","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143397230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Wrinkling of Quasi-2D Perovskite for High-Performance and Flexible Photodetectors","authors":"Sanfeng Lei, Zhenmei He, Chenyu Hu, Guoshuai Zhang, Xixiang Zhu, Jinpeng Li, Kai Wang, Haomiao Yu","doi":"10.1002/adom.202401843","DOIUrl":"https://doi.org/10.1002/adom.202401843","url":null,"abstract":"<p>Flexible photodetectors have garnered significant attention in recent years due to their potential applications in emerging fields such as artificial intelligence, medical diagnostics, and wearable devices. Quasi-2D perovskites exhibit remarkable optoelectronic properties, excellent environmental stability, and mechanical flexibility, making them promising materials for flexible photodetectors. Achieving precise control over the morphology of these materials is crucial for enhancing device performance. In this study, periodic wrinkle structures are introduced into quasi-2D perovskite films by applying pre-stretching stress to a flexible substrate. These results indicate that these ordered wrinkle structures facilitate grain movement during formation, enabling smaller grains to fill pores and surround larger grains. This process leads to a denser film with a mixed 2D-3D phase architecture, enhancing charge transfer efficiency and prolonging carrier lifetime in the perovskite films. Consequently, the responsivity of the resulting flexible perovskite photodetector significantly increased, reaching 86.7 A W<sup>−1</sup>, which is 2.5 times higher than that of the unstretched device. Furthermore, the wrinkled structures enhanced mechanical tolerance, allowing the photodetector to retain 80% of its initial responsivity even after 10 000 stretching cycles. These findings highlight the potential of wrinkled structures to significantly enhance the performance of flexible perovskite optoelectronic devices.</p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"13 2","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Nanometric Ge Films for Ultrafast Modulation of THz Waves with Flexible Metasurface (Advanced Optical Materials 36/2024)","authors":"Kemeng Wang, Yogesh Kumar Srivastava, Thomas CaiWei Tan, Rajour Tanyi Ako, Madhu Bhaskaran, Sharath Sriram, Jianqiang Gu, Ranjan Singh","doi":"10.1002/adom.202470119","DOIUrl":"https://doi.org/10.1002/adom.202470119","url":null,"abstract":"<p><b>Nanometric Ge Films for Ultrafast THz Modulation</b></p><p>Nanometric germanium films, vastly thinner than terahertz wavelengths, have been integrated with a responsive metasurface of metallic terahertz asymmetric split ring resonators on a low-loss flexible substrate (cyclic olefin copolymer film). These ultrathin, flexible, and ultrafast functional metasurfaces enable efficient, low-power terahertz modulation. For further information, see article number 2402010 by Jianqiang Gu, Ranjan Singh, and co-workers. \u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 36","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202470119","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Single Source Polychromatic Luminescent and White Emitting Copper Nanoclusters","authors":"Niladri Sarkar, T. P. Radhakrishnan","doi":"10.1002/adom.202402451","DOIUrl":"https://doi.org/10.1002/adom.202402451","url":null,"abstract":"<p>The low cost and fine-tunability of the luminescence of copper nanoclusters make them attractive candidates for opto-electronic, imaging, and sensing applications; their stability, and a precise understanding of the structure–function correlations however, continue to be challenging. A comprehensive chemical etching strategy is developed to synthesize orange, blue, and cyan emitting nanoclusters from a single source of ultrasmall copper nanoparticles; high quantum yields up to ≈34% are realized. Steady state and time-resolved spectroscopy, electron microscopy, high resolution mass spectrometry, and computational modeling provide critical mechanistic insight into the polychromatic luminescence. A facile method for the fabrication of polymer nanocomposite thin films that sustain and stabilize the luminescent nanoclusters is presented. A subtle variation of the etching strategy without the need to admix multiple components, provides white luminescent thin films with Commission Internationale de l'éclairage (CIE) coordinates, <i>x</i> = 0.35, <i>y</i> = 0.33. The highlights of this work are i) the simple solution synthesis of stable, uniform, and pure ultrasmall Cu nanoparticles, ii) their chemical etching by subtle variations in an optimized protocol to produce highly luminescent, polychromatic nanoclusters, including white-emitting ones, iii) stabilization of the bright luminescent systems in nanocomposite thin films, and iv) a detailed analysis of the luminescence tuning.</p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"13 5","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143397387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tetiana Slusar, Alexander Azarov, Augustinas Galeckas, Anders Hallén, Jung Jin Ju, Kiwon Moon, Andrej Kuznetsov
{"title":"Er:LiNbO3 Quantum Memory Platform Optimized with Dynamic Defect Annealing (Advanced Optical Materials 36/2024)","authors":"Tetiana Slusar, Alexander Azarov, Augustinas Galeckas, Anders Hallén, Jung Jin Ju, Kiwon Moon, Andrej Kuznetsov","doi":"10.1002/adom.202470118","DOIUrl":"https://doi.org/10.1002/adom.202470118","url":null,"abstract":"<p><b>Optimized Er-Doped LiNbO<sub>3</sub> Quantum Memory Platform</b></p><p>In the study by Andrej Kuznetsov, Kiwon Moon, and co-workers (see article number 2401374), an optimized approach for fabricating an efficient solid-state photonic quantum memory platform is proposed. This approach relies on dynamic defect annealing occurring in the LiNbO<sub>3</sub> matrix material during its implantation with Er ions at elevated temperatures. The resulting platform, with minimized crystalline disorder and enhanced optical activity, is promising for realizing robust quantum memory with extended storage times and high efficiencies.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 36","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202470118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Highly Refractive Transparent Half-Heuslers for Near Infrared Optics and Their Material Design (Advanced Optical Materials 36/2024)","authors":"Akihiro Ishii, Ruon Katsuragi, Satoru Tanaka, Itaru Oikawa, Masaaki Imura, Hitoshi Takamura","doi":"10.1002/adom.202470120","DOIUrl":"https://doi.org/10.1002/adom.202470120","url":null,"abstract":"<p><b>Highly Refractive Transparent Half-Heuslers for Near-Infrared Optics</b></p><p>Advanced control of light focusing, reflection, and transmission is possible by using highly refractive transparent materials. In article number 2402295, Akihiro Ishii, Hitoshi Takamura, and co-workers report the discovery of 22 ternary half-Heuslers that exhibit higher refractive indices with wider band gaps than conventional high-refractive-index transparent materials in the near-infrared region. Material design strategies for achieving a high index and wide gap are also explained.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 36","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202470120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mohammad Ali Nasiri, José F. Serrano-Claumarchirant, Clara M Gómez, Andres Cantarero, Josep Canet-Ferrer
{"title":"Back Mirror-Free Selective Light Absorbers for Thermoelectric Applications","authors":"Mohammad Ali Nasiri, José F. Serrano-Claumarchirant, Clara M Gómez, Andres Cantarero, Josep Canet-Ferrer","doi":"10.1002/adom.202402079","DOIUrl":"https://doi.org/10.1002/adom.202402079","url":null,"abstract":"<p>Improving light absorption is essential for the development of solar thermoelectric generators. Most efficient light absorbers require a back mirror (a thick metal film) to reduce the reflectivity by promoting the interference between the incident and the reflected light. However, the presence of thick a continuous metal film supposes a limitation for thermoelectric applications, as it behaves like a shortcut of the Seebeck voltage. In this work, a back mirror-free selective light absorber is presented, designed for the fabrication of thermoelectric devices. The combination of a high and a low refractive index material covered by a semi-transparent electrode is optimized. As a difference to the back mirror, the semi-transparent electrode can be patterned to prevent the quenching of the Seebeck voltage. Thanks to this, the low refractive index material can be replaced by a transparent thermoelectric, enabling efficient heat-to-energy conversion with negligible loss of absorption performance.</p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"13 2","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202402079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alba Díaz-Lobo, Irene Castro-Fernández, Eduardo Blanco, Daniel Ramos, Marisol Martin-Gonzalez, Cristina V. Manzano
{"title":"Shedding Light on the Mid-Infrared Complex Refractive Index of Anodic Aluminum Oxide","authors":"Alba Díaz-Lobo, Irene Castro-Fernández, Eduardo Blanco, Daniel Ramos, Marisol Martin-Gonzalez, Cristina V. Manzano","doi":"10.1002/adom.202401967","DOIUrl":"https://doi.org/10.1002/adom.202401967","url":null,"abstract":"<p>In the current scientific landscape, the understanding of optical properties in the mid-infrared (mid-IR) range (3–30 µm) is crucial in simulations and models to explore the potential of materials for various applications. However, due to the challenges associated with mid-IR characterization, accurate refractive index (<i>n</i>) and extinction coefficient (<i>κ</i>) data are often lacking in the literature. This study addresses this gap by investigating the mid-IR <i>n</i> and <i>κ</i> spectra of anodic aluminum oxide (AAO) nanostructures anodized under different conditions, using two distinct approaches: IR ellipsometry and a theoretical model based on multilayer reflection and effective medium. The results demonstrate a strong agreement: the anodizing conditions have a significant influence on the optical properties of the AAO nanostructures. These differences enable accurate simulations of the emissivity spectra of AAO nanostructures on Al foils, which align closely with experimental measurements. This theoretical approximation is versatile and extensible to a broad range of materials. Different materials are tested, namely, a sapphire, a polycarbonate film, and a polyethylene terephthalate (PET) film achieving a useful qualitative description. This study paves the way for a novel approach in the engineering of new micro and nano-optical materials, facilitating their evaluation for suitability in mid-IR applications.</p>","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"13 1","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202401967","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}