Optical Materials最新文献

{"title":"Orbital momentum mode generation by a tunable diffractive optical element based on lithium niobate","authors":"Alexander Esin ,&nbsp;Andrey Akhmatkhanov ,&nbsp;Vladimir Pavelyev ,&nbsp;Vladimir Shur","doi":"10.1016/j.optmat.2024.116401","DOIUrl":"10.1016/j.optmat.2024.116401","url":null,"abstract":"<div><div>Tunable LiNbO₃-based diffractive optical elements (DOEs) to control orbital angular momentum spectrum of the beam are proposed. Tunable binary spiral axicons for generation of the beam with orbital angular momentum (topological charge <em>l</em> = 1) are fabricated and investigated experimentally by optical methods. The intensity distribution in the far field under a half-wave voltage (3400 V) applied to the DOE was in good agreement with the theoretical prediction. It was shown that utilization of two oppositely-rotating DOEs leads to appearance of a correlation peak, thus demonstrating ability to realize the correlation filtration for orbital momentum mode detection in telecommunication system. The response time of the DOEs was evaluated using an element designed for generating a TEM01 mode and fabricated by the same technology. The measured response time below 200 ns was limited by the bandwidth of the used photodiode. The proposed elements can be used in optical telecommunication systems with mode division multiplexing.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116401"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scintillation properties of flexible scintillator composed on polydimethylsiloxane integrated with Lu2GdAl3Ga2O12:Pr2O3 phosphors","authors":"J.M. Park ,&nbsp;C.G. Kang ,&nbsp;S.J. Kim ,&nbsp;H.J. Kim ,&nbsp;Sudipta Saha","doi":"10.1016/j.optmat.2024.116347","DOIUrl":"10.1016/j.optmat.2024.116347","url":null,"abstract":"<div><div>This study explored the luminescence properties and sensitivity of a flexible scintillator composed on polydimethylsiloxane integrated with Lu₂GdAl₃Ga₂O₁₂ doped with 1 mol% Pr₂O₃ phosphors. The flexible scintillator was fabricated using a molding technique. The luminescence properties were investigated under photo, proton, and X-ray excitation at room temperature. The scintillator exhibited sharp and narrow emission peaks attributed to f-f transitions, and a decay time of 14 <span><math><mi>μ</mi></math></span>s. It demonstrated a sensitivity of 0.638 <span><math><mi>μ</mi></math></span>C/R<span><math><mi>⋅</mi></math></span>cm³ under an X-ray dose of 1.841 R. This study demonstrates a high performance flexible scintillator suitable for advanced radiation detection applications in medical imaging and safety monitoring.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116347"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Ga₂O₃ solar-blind photodetectors: From civilian applications to missile detection and research agenda","authors":"Yana Suchikova ,&nbsp;Serhii Nazarovets ,&nbsp;Anatoli I. Popov","doi":"10.1016/j.optmat.2024.116397","DOIUrl":"10.1016/j.optmat.2024.116397","url":null,"abstract":"<div><div>This study offers a comprehensive review of gallium oxide (Ga₂O₃)-based photodetectors, emphasizing their applications in solar-blind UV detection and missile tracking systems. Using bibliometric, patent, and content analysis, research trends and technological developments were examined through an extensive review of scientific publications and patents. The analysis highlights the evolution of Ga₂O₃ photodetectors, particularly in fabrication techniques, device performance, and military applications. The study identifies critical research gaps, such as the need for optimized fabrication methods and the development of self-powered photodetectors. It proposes a research agenda to improve the efficiency and reliability of Ga₂O₃-based photodetectors for advanced applications, including missile detection and beyond.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116397"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of crystal field inhomogeneities on the spontaneous and laser tuning emission of a Nd3+-doped Li2O–BaO–Al2O3–P2O5 glass","authors":"Sara García-Revilla ,&nbsp;Jon Azkargorta ,&nbsp;Ignacio Iparraguirre ,&nbsp;Francisco Muñoz ,&nbsp;Joaquín Fernández ,&nbsp;Rolindes Balda","doi":"10.1016/j.optmat.2024.116417","DOIUrl":"10.1016/j.optmat.2024.116417","url":null,"abstract":"<div><div>The present work focuses on the spectroscopic and laser properties of Nd³⁺ in a Li₂O–BaO–Al₂O₃–P₂O₅ aluminophosphate glass which includes Judd-Ofelt calculation, stimulated emission cross-section of the ⁴F_3/2 → ⁴I_11/2 emission laser transition, lifetime of the ⁴F_3/2 state and quantum efficiency. Site-selective laser spectroscopy and stimulated emission under selective excitation has been performed to determine the crystal field inhomogeneity at the Nd³⁺ site together with its broadening effect on the spontaneous and laser emissions. However, a much narrowed laser emission has been achieved by using an intracavity tilting plate which acts as a tunable optical filter to adjust the laser wavelength.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116417"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Optoelectronic and Photocatalytic investigations of chitosan (CS) modified Platinum decorated ceria (Pt-CeO2-CS) composite","authors":"Safoora Shabbir ,&nbsp;Rabia Naeem ,&nbsp;Tehmeena Ishaq ,&nbsp;Muhammad Adil Mansoor ,&nbsp;Saba Afzal ,&nbsp;Fatima Hassan","doi":"10.1016/j.optmat.2024.116376","DOIUrl":"10.1016/j.optmat.2024.116376","url":null,"abstract":"<div><div>Herein, a comparative study is performed to evaluate the Photodegradation of Methyl Orange (MO) and Photoelectrochemical (PEC) activities of novel ternary Pt–CeO₂/Chitosan (Pt–CeO₂/CS), and binary Pt/Chitosan (Pt/CS) and CeO₂/Chitosan (CeO₂/CS) composites synthesized via the chemical reduction and sol-gel methods. The structural, thermal, morphological, and optical characteristics of composite were examined using Fourier Transform Infra-Red (FTIR) Spectroscopy, Thermogravimetry (TG), Field Emission Scanning Electron Microscopy (FESEM) coupled with Electron Diffraction Spectroscopy (EDS), X-ray Diffraction (XRD), X-ray Photoelectron (XPS), UV–visible (UV–Vis), photoluminescence (PL) and Raman Spectroscopy. The UV–vis band gap analysis revealed that the reduction in the bandgap value E_g value (2.7eV) increases the light absorption property. The as synthesized ternary Pt–CeO₂/CS composite acts as a photocatalyst for dye decolourisation, with a maximum of 84 % of methyl orange (MO) decolourisation at <em>λ</em>_max of 464 nm under light irradiation. The kinetics of ternary composite was found to follow pseudo-first-order with rate constant of 0.01279 min⁻¹. Moreover, the photoelectrochemical performance of Pt–CeO₂/CS hybrid composite with 1.3 ∼ 2.5-fold higher value of current density (1.8 mA/cm² at 0.67 V vs. Ag/AgCl) is attained as compared to binary CeO₂/CS and Pt/CS composites. The probable enhanced charge transfer process in Pt–CeO₂/CS has been proposed responsible for the enhanced photodegradation of MO dye and improved PEC water splitting performance.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116376"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acceptor-acceptor′-acceptor type N-annulated perylenediimide dimeric acceptors at the outside-bay position: Synthesis and role of asymmetric 4,7-di(thien-2-yl)-5-fluorobenzothiadiazole linker","authors":"Lili An ,&nbsp;Jiayu Fang ,&nbsp;Zezhou Liang ,&nbsp;Junfeng Tong ,&nbsp;Tianzhi Yu","doi":"10.1016/j.optmat.2024.116386","DOIUrl":"10.1016/j.optmat.2024.116386","url":null,"abstract":"<div><div>Acceptor-acceptor′-acceptor (A-A′-A) type <em>N</em>-annulation perylene diimide (PDI) dimeric acceptors possessed the fascinating merits but were ignored. Herein, two A-A′-A type <em>N</em>-annulated PDI dimers, termed as, DTBT-(PPDI-B)₂ and DTFBT-(PPDI-B)₂, in which the electron-deficient moieties 4,7-di(thien-2-yl)benzothiadiazole (DTBT) and monofluorinated 4,7-di(thien-2-yl)-5-fluorobenzothiadiazole (DTFBT) were selected as the central linkers and two <em>N</em>-annulation <em>N</em>-butyl-[1,12-<em>b</em>,<em>c</em>,<em>d</em>]pyrrole-<em>N</em>,<em>N</em>ʹ-bis(2-hexyldecyl)perylenediimide (PPDI-B) aromatic rings as the dual wings were explored. The annulation-free DTBT-(PDI-HD)₂ was chosen as reference material. Owing to electron-donating of the newly formed pyrrolic aromatic ring, these studied <em>N</em>-annulated acceptors possessed the improved absorption and up-shifted <em>E</em>_LUMO than those of the counterpart DTBT-(PDI-HD)₂. Both of them exhibited the wide absorption spectra spanning from 300 nm to 700 nm, the similar aggregation and good photostability in solution. Monofluorinating the central benzothiadiazole linker gave the enhanced absorption, the down-shifted <em>E</em>_HOMO and <em>E</em>_LUMO, the reduced the dihedral angle from 9.09° to 3.64° between two <em>N</em>-annulated PPDI sub-planes and the enhanced solid stacking and aggregation. As a result, the <em>N</em>-annulation modification achieved the 0.16 V increased <em>V</em>_OC, decreased <em>J</em>_SC and FF, and thus the reduced PCE of 0.90 %. Moreover, the 21.33 % increased <em>J</em>_SC of 3.64 mA cm⁻² and the 35.58 % raised <em>FF</em> up to 42.68 % were observed in the monofluorinated PTB7-Th:DTFBT-(PPDI-B)₂-based device, synergistically contributing to an 62.22 % elevated PCE of 1.46 % in spite of a 0.01 V dropped <em>V</em>_OC. This upgradation was predominantly profited from the increased absorption, the improved exciton dissociation, elevated electron mobility and improved microstructural morphology benefiting from introducing the asymmetric 4,7-dithienyl-5-fluorobenzothiadiazole. This work demonstrates that outside bay <em>N</em>-annulation strategy could tune the molecular structure, energy level and thus improve the voltage, and monofluorinating the central linker is an effective tactic for regulating the molecular configuration, aggregation, morphology and thus elevating the photovoltaic performance in the A-A′-A type <em>N</em>-annulated PDI dimeric acceptors.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116386"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A low quantum defect and power scalable Yb-doped glass waveguide laser","authors":"Harsh Vaid ,&nbsp;Sharashti Saxena ,&nbsp;Pradeesh Kannan ,&nbsp;Amol Choudhary","doi":"10.1016/j.optmat.2024.116399","DOIUrl":"10.1016/j.optmat.2024.116399","url":null,"abstract":"<div><div>We present a continuous wave laser action in ytterbium (Yb)-doped phosphate glass buried channel waveguides. The 25 mm long waveguides were fabricated by the standard ion exchange method. When pumped with a 976 nm laser diode, the waveguide laser emits at 982.4 nm, yielding an ultralow quantum defect of 0.66 %. The impact of coupling and pump power variation on the laser emission wavelengths is demonstrated. Furthermore, the results of pulsing using a monolayer graphene as a saturable absorber (SA) are presented and a pulse train with a repetition rate of 1 MHz and a pulse width of 700 ns was obtained.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116399"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of colloidal snowflake-like silver nanoparticles and their use for SERS detection of pesticide imidacloprid at trace levels","authors":"Cao Tuan Anh ,&nbsp;Dao Tran Cao ,&nbsp;Luong Truc-Quynh Ngan","doi":"10.1016/j.optmat.2024.116422","DOIUrl":"10.1016/j.optmat.2024.116422","url":null,"abstract":"<div><div>Besides conventional methods, trace concentration detection of molecules can now be performed with the emerging surface-enhanced Raman scattering (SERS) spectroscopy. A key factor in achieving high performance in SERS is the quality of the substrate, which must exhibit a high, uniform and reproducible enhancement factor. Silver nano snowflakes (AgNSFs) meet these criteria effectively. In this report, we present a simple procedure to synthesize uniform colloidal AgNSFs, approximately 2 μm in size, by reducing aqueous silver nitrate with hydroxylamine at room temperature. These AgNSFs were then deposited onto an aluminum foil and dried to create a SERS substrate. The performance of this SERS substrate was first tested using rhodamine 6G (R6G), demonstrating detection capabilities down to a concentration of 10⁻¹⁴ M, with a SERS enhancement factor reached 2.8 × 10¹¹, and a high degree of uniformity and reproducibility (with a relative standard deviation less than 9 %). Additionally, when applied to detect the important pesticide imidacloprid (IMI), the substrate enabled detection at concentrations as low as 0.005 mg/L, with a detection limit of 0.1 μg/L (0.1 ppb). These findings suggest that the AgNSFs synthesized in this study have significant potential for application in SERS measurements, particularly in food safety and environmental monitoring applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116422"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of flexible and mesoporous CdS/ZnS/PVDF nanocomposites with remarkable organic dye degradation performance under natural sunlight","authors":"Sh. Anju Devi ,&nbsp;K. Jugeshwar Singh ,&nbsp;K. Nomita Devi","doi":"10.1016/j.optmat.2024.116373","DOIUrl":"10.1016/j.optmat.2024.116373","url":null,"abstract":"<div><div>The engineering of polymer-based nanocomposites is a highly promising strategy for improving both the efficiency and stability of catalysts used in wastewater treatment. In this work, we explore the efficacy of flexible CdS/ZnS/PVDF nanocomposite films towards degradation of Malachite Green dye under low energy visible light and ambient sunlight. Films with varying weight percentage of CdS/ZnS nanofillers (0 %, 5 %, 10 %, 15 %, 20 %) were successfully prepared by solution casting method and the physiochemical properties were characterized using various techniques such as XRD, SEM, AFM, EDX, BET, UV–Vis DRS and FTIR. Pore diameter of 5.5 nm was observed, indicating that CdS/ZnS is mesoporous in nature. Under the optimum photocatalytic condition of 15 ppm dye concentration and pH 9, 15 wt% CdS/ZnS/PVDF showed the maximum photodegradation efficiency of 93.5 % in 30 min. The sample exhibited excellent reusability for five consecutive runs of the experiments which show a degradation percentage of 92.1 % in the fifth run and the scavenging study established that superoxide radicals play the major role in the photodegradation process. The experiments under natural sunlight on three separate days showed a remarkable photodegradation performance of 89 %, 93.4 % and 93.6 % highlighting the potential of CdS/ZnS/PVDF nanocomposites for sustainable wastewater treatment under natural sunlight.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116373"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-performance flexible and broadband photodetectors on paper substrates using FeSnS bimetallic sulfide nanosheets","authors":"Parth V. Shah ,&nbsp;Pratik M. Pataniya ,&nbsp;Sohel Siraj ,&nbsp;Parikshit Sahatiya ,&nbsp;Vasant Sathe ,&nbsp;C.K. Sumesh","doi":"10.1016/j.optmat.2024.116384","DOIUrl":"10.1016/j.optmat.2024.116384","url":null,"abstract":"<div><div>Advancements in technology have made it easier to construct flexible broadband photodetectors for wearable devices, improving light harvesting and detecting capabilities. This work described a new study that used bimetallic sulfide nanosheets (FeSnS) to produce flexible and broadband photodetectors on paper substrates using hand-print method. A simple, economical, one-step hydrothermal technique was employed to synthesise FeSnS materials, which were characterised using XRD, UV–Vis Spectroscopy, FESEM, EDS, XPS, and UPS. Photodetection tests found that 2-FeSnS (Fe at 2 wt%) outperformed similar work on paper-based devices, with a responsivity of 32.4 mA/W under a 470 nm incident wavelength, high specific detectivity, and a response time of 1.16 s. Durability and flexibility testing validated the robustness of the device. The use of a simple hydrothermal synthesis and hand-print fabrication method to create high-performance, eco-friendly, and flexible photodetectors is novel, expanding their potential applications in wearable electronics, environmental monitoring, and low-cost disposable sensing platforms.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116384"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}