ACS Applied Optical Materials最新文献

{"title":"Accidental BICs and Chiroptical Response of Hollow Channels in Silicon Nanodisk Resonator-Based Metasurfaces for Chiral Sensing","authors":"Shubhanshi Sharma*,&nbsp;Alina Karabchevsky and Shailendra K. Varshney,&nbsp;","doi":"10.1021/acsaom.4c0048910.1021/acsaom.4c00489","DOIUrl":"https://doi.org/10.1021/acsaom.4c00489https://doi.org/10.1021/acsaom.4c00489","url":null,"abstract":"<p >Achieving light confinement at the nanoscale is essential for enhancing light-matter interactions, and bound states in the continuum (BICs) have emerged as promising approaches. This study presents a dielectric metasurface design featuring air channels within a silicon nanodisk resonator, demonstrating symmetry-protected BICs (SPBICs) and accidental BICs (ABICs). Here, we report SPBICs that exhibit an exceptionally high quality (<i>Q</i>) factor at very low asymmetry parameters. An increase in the asymmetry decreases the <i>Q</i>-factor quadratically. To alleviate this, we observe that the SPBIC can be transformed into ABICs by adjusting the radius of one air channel that converts the resonances from quasi-SPBICs to quasi-ABICs. Introducing a third air channel with an optimized radius helps to achieve an ultrahigh <i>Q</i>-factor ≈ 38000. Multiple ABICs with enhanced local fields were observed for both <i>x</i>- and <i>y</i>-polarizations. The triple air channel design also achieves a maximal extrinsic chiral response by breaking the symmetry through an oblique incidence angle, which influences circular dichroism (CD) and transmittance for different circular polarizations. Numerical simulations reveal that the proposed chiral metasurface achieves a near-perfect value of CD = −0.99, a <i>Q</i>-factor of 8846, and a field enhancement by a factor of 200. Moreover, slightly tilting the nanodisk can realize a high intrinsic chirality (CD = −0.88) with a <i>Q</i>-factor ≈ 10⁴. The concept of chiral BICs studied here can be utilized in, but not limited to, applications such as chiral sensing, bioimaging, and chiroptical spectroscopy.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 2","pages":"364–374 364–374"},"PeriodicalIF":0.0,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507601","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}

{"title":"Modulating Tetra-Modal Luminescence of LaAlO3:Sm3+ Storage Phosphors Through Intrinsic Defect Engineering and Co-Doping","authors":"Nimai Pathak*,&nbsp;Abdulelah Alolayan,&nbsp;Kawsar Ali and Yuanbing Mao*,&nbsp;","doi":"10.1021/acsaom.4c0048210.1021/acsaom.4c00482","DOIUrl":"https://doi.org/10.1021/acsaom.4c00482https://doi.org/10.1021/acsaom.4c00482","url":null,"abstract":"<p >Long-lasting persistent phosphors with efficient multimodal luminescence properties serve not only as effective storage phosphors but also as essential components for developing reliable anticounterfeiting materials. However, achieving simultaneous multimodal luminescence in storage phosphors poses a significant challenge, as it necessitates the coexistence of multiple luminescence mechanisms within the same matrix along with the creation of effective traps at various energy levels for charge carrier storage. This study presents the synthesis of LaAlO₃ phosphors doped with varying mol % of Sm³⁺ using a coprecipitation method followed by a molten salt reaction. The objective is to investigate their multimodal luminescence properties and potential applications in optical storage and anticounterfeiting. These phosphors exhibit persistent luminescence (PersL) lasting for hours and controllable by doping levels along with efficient optically stimulated luminescence (OSL) when being excited by a 980 nm laser after UV preirradiation. Thermo-stimulated luminescence (TSL) reveals multiple deep traps with enhanced OSL. Additionally, the LAO:0.5S phosphor shows PersL upon X-ray irradiation, suggesting potential for imaging applications. Gd³⁺ incorporation optimized PersL and OSL performance while DFT calculations elucidated trapping mechanisms. These findings of tetra-modal luminescence comprising downconversion luminescence (PL &amp; RL), PersL, OSL, and TSL highlight the multifunctional potential of these LaAlO₃-based phosphors for advanced optical applications.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 2","pages":"336–345 336–345"},"PeriodicalIF":0.0,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsaom.4c00482","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Deposition Temperature on the Characteristics of Ga2O3 Films Grown on Flexible Mica and the Performance of Corresponding Photodetectors","authors":"Zhefeng Wang,&nbsp;Fabi Zhang*,&nbsp;Tangyou Sun,&nbsp;Xingpeng Liu,&nbsp;Ying Peng,&nbsp;Zanhui Chen,&nbsp;Peihua Wangyang,&nbsp;Daoyou Guo,&nbsp;Xu Wang and Haiou Li,&nbsp;","doi":"10.1021/acsaom.4c0039410.1021/acsaom.4c00394","DOIUrl":"https://doi.org/10.1021/acsaom.4c00394https://doi.org/10.1021/acsaom.4c00394","url":null,"abstract":"<p >In this study, we fabricated flexible Ga₂O₃ photodetectors (PDs) based on Ga₂O₃/mica flexible structures obtained at different substrate temperatures. Higher substrate temperatures result in higher quality crystals for the film, but they also reduce the photoresponsivity of the PD. Meanwhile, the dark current of the PD gradually decreases, and the response time is significantly shortened. The PD fabricated at 440 °C exhibited a responsivity of 4.45 W/A at 20 V bias and weak UV illumination of approximately 380 μW/cm² (at 254 nm). It also demonstrated a high detectivity (<i>D</i>*) of 6.07 × 10¹² Jones and an extremely low noise equivalent power (NEP) of 4.42 × 10^–13 W/Hz^1/2. At 680 °C, the PD exhibits an extremely low dark current (1.6 × 10^–13 A at 20 V) and a fast response time (τ_rise: 0.89 s, τ_decay: 0.26 s). Additionally, in bending tests, the PDs maintained nearly constant performance, demonstrating excellent flexibility and revealing the potential applications of Ga₂O₃ flexible PDs in future wearable electronics.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 2","pages":"272–283 272–283"},"PeriodicalIF":0.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507865","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}

{"title":"Ultrafast and Deformation-Free Electrooptic Switching of Nanocomposite Liquid Crystal Holographic Optical Elements","authors":"Kazuma Nakajima,&nbsp;Motoki Tokura,&nbsp;Takuto Nakade and Masanori Ozaki*,&nbsp;","doi":"10.1021/acsaom.4c0043510.1021/acsaom.4c00435","DOIUrl":"https://doi.org/10.1021/acsaom.4c00435https://doi.org/10.1021/acsaom.4c00435","url":null,"abstract":"<p >Liquid crystal-based holographic optical elements (LC-based HOEs) have garnered significant attention for their high diffraction efficiency, flexibility, and lightweight nature, making them ideal for applications such as near-eye displays, head-up displays, and beam steering devices. However, conventional LC-based HOEs have issues with pattern deformation and slow recovery when an electric field is applied, and often require additional LC layers or mechanical actuation to achieve effective switching. This study introduces nematic liquid crystal (NLC) nanocomposites that enable electro-optic switching while retaining the original director orientation pattern. The HOE with the NLC nanocomposite maintains high diffraction efficiency even under an applied electric field, with experimental results strongly correlating with theoretical simulations. Moreover, ultrafast response times of less than 100 μs were achieved. These findings highlight the potential of NLC nanocomposites for developing high performance, compact LC-based HOEs capable of rapid switching, expanding their applications in advanced optical systems such as beam steering.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 1","pages":"125–130 125–130"},"PeriodicalIF":0.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143088841","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}

{"title":"Multicolor Band-Edge Electrochemiluminescence of Colloidal Silicon Quantum Dots in a Thin-Layer Cell","authors":"Ryota Sugaya,&nbsp;Keisuke Kuniyoshi,&nbsp;Seiya Yamamoto,&nbsp;Shoma Hada,&nbsp;Kosuke Yamazaki,&nbsp;Nobuyoshi Koshida,&nbsp;Takashi Kasahara and Toshihiro Nakamura*,&nbsp;","doi":"10.1021/acsaom.4c0044810.1021/acsaom.4c00448","DOIUrl":"https://doi.org/10.1021/acsaom.4c00448https://doi.org/10.1021/acsaom.4c00448","url":null,"abstract":"<p >We demonstrate band-edge, multicolor, electrochemiluminescence (ECL) of colloidal silicon quantum dots (SiQDs) in a thin-layer transparent two-electrode cell configuration. SiQDs with different size distributions are prepared by low-temperature thermal cracking of porous silicon and subsequent size separation using the gel permeation chromatography technique. The cell consisting of an organic solution-dispersed SiQD layer between two thin transparent electrodes exhibits orange to red luminescence at a voltage of ∼3 V depending on the size distribution of SiQDs. The electrochemical analysis of SiQDs by the cyclic voltammetry technique and theoretical calculations confirm the formation of an electric double layer, revealing that electron–hole pair excitation in SiQD cores occurs in association with collisions between electrically generated cations and anions of SiQDs at the transparent electrodes of the cell. Radiative recombination of excited electron–hole pairs at the band-edges of the size-dependent electronic energy gap of the SiQDs enables the multicolor ECL from the cell.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 1","pages":"178–187 178–187"},"PeriodicalIF":0.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143087810","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}

{"title":"High-Efficiency, Long-Lived, Multicolor Tunable Pure Organic Materials for Dual Fluorescent-Phosphorescent Emission at Room Temperature","authors":"Limei Tang,&nbsp;Ling Chen,&nbsp;Yujiao Luo,&nbsp;Yuman Li,&nbsp;Yujiao Zhang,&nbsp;Jie Zhao and Wei Shen*,&nbsp;","doi":"10.1021/acsaom.4c0045110.1021/acsaom.4c00451","DOIUrl":"https://doi.org/10.1021/acsaom.4c00451https://doi.org/10.1021/acsaom.4c00451","url":null,"abstract":"<p >Currently, numerous afterglow materials often suffer from low phosphorescence quantum yields (Φ_Ph) and are confined to a singular luminescent color. In this study, we devised an approach by incorporating four distinct carbazole derivative guest molecules, featuring varying degrees of halogen substitution and naphthalene group substitution sites, into β-estradiol host molecules through high-temperature melt doping to create four exceptional organic composites. Remarkably, all four materials exhibit exceptional characteristics, including prolonged afterglow lifetimes and ultrahigh afterglow quantum yields, with the pinnacle phosphorescence lifetime soaring to 904.76 ms and the peak phosphorescence quantum yield achieving a remarkable 40.0%. Notably, even without heavy atom incorporation, the phosphors managed to attain a Φ_Ph of 18.0%, underscoring their unique properties. Furthermore, our experiments unveiled an intriguing phenomenon: rather than a single fluorescence or phosphorescence emission, these materials exhibit dual-emission characteristics, encompassing both fluorescence and phosphorescence. The versatility in luminescence color manipulation was further demonstrated by adjusting the temperature and excitation wavelength, offering unparalleled flexibility. Moreover, the fluorescence hues of these materials could be finely tuned by varying the number of halogen atoms, adding another layer of color tunability. Theoretical calculations provided valuable insights, showing that changes in the number of bromine substitutions and the substitution positions of the naphthalene group significantly affect the molecule’s spin–orbit coupling constants and the nature of its excited states. This understanding not only highlights the molecular mechanisms behind the observed luminescence properties but also provides a roadmap for the future design and optimization of such advanced luminescent materials.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 1","pages":"212–222 212–222"},"PeriodicalIF":0.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143087708","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}

{"title":"Fabry–Perot Resonances in Rb3Sb2I9 Microcrystals for Optical Sensing Applications","authors":"Ayusmin Panda,&nbsp;Rakshitha H. Ashwath,&nbsp;Chandran Sudakar* and Birabar Ranjit Kumar Nanda*,&nbsp;","doi":"10.1021/acsaom.4c0043810.1021/acsaom.4c00438","DOIUrl":"https://doi.org/10.1021/acsaom.4c00438https://doi.org/10.1021/acsaom.4c00438","url":null,"abstract":"<p >Rhombus-shaped thin Rb₃Sb₂I₉ microcrystals are investigated for their photoluminescence (PL) spectral properties. The spectra show broad self-trapped excitonic emissions with superimposed periodic spectral modulations. Through numerical analysis and an appropriate interference function model, we demonstrate that these spectral modulations arise from Fabry–Perot (FP) interferences, which are rarely observed in halide perovskites. The microcrystal with thin, large flat facets acts as an FP resonating cavity with two parallel mirror surfaces that capture and resonate the incident light throughout the crystal. The FP resonances have been confirmed through 3D full-field finite difference time domain simulations, which reveal variations in electric field eigenmodes with different crystal thicknesses and incident wavelengths. These self-resonating highly sensitive FP microcrystals have potential applications in various lead-free optoelectronic devices, including optical sensors, and as absorption enhancers in perovskite solar cells.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 1","pages":"144–152 144–152"},"PeriodicalIF":0.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143091152","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}

{"title":"PEI-Mediated Copper Deposition Strategy for Optical Signal Amplification on Lateral Flow Immunoassay Platform","authors":"Mengyao Li,&nbsp;Yao Wang* and Hong Xu,&nbsp;","doi":"10.1021/acsaom.4c0045810.1021/acsaom.4c00458","DOIUrl":"https://doi.org/10.1021/acsaom.4c00458https://doi.org/10.1021/acsaom.4c00458","url":null,"abstract":"<p >Here we report PEI-mediated copper in situ deposition (CISD) as a general signal enhancement strategy for a commercial colloidal gold nanoparticles (AuNPs)-based lateral flow immunoassay (LFIA) platform. The copper shell could be coated on AuNPs which aggregate on the test line to form core–shell structured composites (AuNPs@Cu) to deepen the colorimetric signal of the strips. After critical elements that affect Cu deposition yields were optimized, a significant signal amplification has been acquired with limit of detection (LOD) improvements of 40 times by naked-eye identification and 100 times by quantitative instrumental analysis using human hemoglobin (hHb) as a target. This study demonstrates a common and simple strategy for upgrading the detection sensitivity of a commercial AuNPs-LFIA platform with a whole running time of 20 min.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 1","pages":"1–5 1–5"},"PeriodicalIF":0.0,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143090416","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}

{"title":"Spectral-Polarization Sensing in Visible Wavelengths Enabled by Nanostructural Encoders","authors":"Juhyeon Kim,&nbsp;Jisoo Kim and Pei-Cheng Ku*,&nbsp;","doi":"10.1021/acsaom.4c0045410.1021/acsaom.4c00454","DOIUrl":"https://doi.org/10.1021/acsaom.4c00454https://doi.org/10.1021/acsaom.4c00454","url":null,"abstract":"<p >A challenge for spectral-polarimetric sensors is their size. Most spectropolarimeters today are benchtop instruments. To address this challenge, we introduce a chip-scale spectropolarimeter design based on nanoscale GaN spectral and polarization encoders and photodetectors. Our proof-of-concept experiments validated the feasibility of measuring an optical signal’s spectrum and polarization in the visible wavelengths, including all four of Stokes parameters. Unlike a conventional spectropolarimeter in which optics completely resolve individual spectral and polarization components, the encoders create slight differences in them. A reconstruction algorithm, e.g., non-negative least-squares optimization, together with proper regularizers, then recovers the spectrum and polarization using a <i>priori</i> response functions of those encoders. Using nanoscale GaN light-emitting diodes with elliptical cross sections, this work demonstrates the recovery of full Stokes parameters in the visible wavelength range, including the degree of polarization for a partially polarized signal. A 1.22° accuracy in the angle of polarization was shown. The vertical optical path enables a high-density integration for imaging spectropolarimetry applications. If the polarization is independent or only a weak function of the wavelength, a single pair of elliptically shaped encoders was shown to suffice to reconstruct the angle of polarization in the range of 0 and 90°.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 1","pages":"205–211 205–211"},"PeriodicalIF":0.0,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143090576","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}

{"title":"Facile and Rapid Fabrication of Opal Photonic Crystals by Electrophoretic Deposition","authors":"Clement Lebastard*,&nbsp;Yousra Hattali,&nbsp;Antoine Le Gendre,&nbsp;Stephane Cordier,&nbsp;Adèle Renaud,&nbsp;Tohru Suzuki,&nbsp;Tetsuo Uchikoshi* and Fabien Grasset,&nbsp;","doi":"10.1021/acsaom.4c0044610.1021/acsaom.4c00446","DOIUrl":"https://doi.org/10.1021/acsaom.4c00446https://doi.org/10.1021/acsaom.4c00446","url":null,"abstract":"<p >The use of photonic crystals (PCs) is gaining interest regarding the interaction between light and organized structures. However, there are limitations to their use, such as production cost, rate, and substrate size. This study demonstrates an efficient and cost-effective fabrication of an opal structure based on the electrophoretic deposition (EPD) of self-made silica particles. The process allows one to reduce the fabrication time compared to classical evaporation or sedimentation methods, which can take days (evaporation) or weeks to months (sedimentation), while this method takes only 2 min. Silica particles with a diameter of less than 300 nm exhibit a markedly low sedimentation rate. Nevertheless, when they form a close-packed structure, they display a partial band gap in the visible region. The resulting opals are iridescent, from blue to red, and display additional angle-dependent colors. Furthermore, the synthesis of silica particles was completed within a 2 h time frame. Their washing, including a centrifugation step, did not result in the formation of aggregates. Such particles tend to break the long-range order in the PCs.</p>","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"3 1","pages":"153–160 153–160"},"PeriodicalIF":0.0,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143090199","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}