Optical Materials最新文献

{"title":"β-NaGdF4:Yb3+/Er3+@SiO2@Au upconverters core–shell nanorods: Synthesis and optical properties","authors":"Z. Smara ,&nbsp;Y. Cheroura ,&nbsp;A. Potdevin ,&nbsp;D. Boyer ,&nbsp;A. Chafa ,&nbsp;M. Bouazaoui ,&nbsp;O. Ziane ,&nbsp;R. Mahiou","doi":"10.1016/j.optmat.2025.117285","DOIUrl":"10.1016/j.optmat.2025.117285","url":null,"abstract":"<div><div>A shell of gold nanoparticles (Au-NPs) have been successfully grafted on a core of β-NaGdF₄:Yb³⁺/Er³⁺ nanorods (NRs) using a simple and rapid protocol. XRD, TEM and IR spectroscopy data demonstrated successful integration of Au-NPs on the surface of β-NaGdF₄:Yb³⁺/Er³⁺-NRs and the formation of a core–shell β-NaGdF₄:Yb³⁺/Er³⁺@SiO₂@Au nanocomposites (NCs). The effect of Au-NPs on the luminescence of β-NaGdF₄:Yb³⁺/Er³⁺@SiO₂@Au-NCs was investigated based on emission spectra as well as luminescence decays, under NIR and UV–Vis excitation. Possible Interaction mechanisms and energy transfers between β-NaGdF₄:Yb³⁺/Er³⁺ and Au-NPs are proposed. The emission intensity of the Er³⁺ ions was modulated through the activation of localized surface plasmon resonance (LSPR) of Au-NPs. Decay time measurements confirmed the presence of an additional decay pathway, attributed to the Forster resonance energy transfer (FRET) process. UV–Vis excitation and FRET efficiency calculations indicate that only a portion of Er³⁺ ions participate in this new decay route.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117285"},"PeriodicalIF":3.8,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523386","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":"Crystalline evolution of c-axis aligned IGZO thin films: From deposition to post-annealing","authors":"Yi-Nung Chao ,&nbsp;Yuan-Chieh Lu ,&nbsp;Gui-Sheng Zeng ,&nbsp;Sheng-Hui Chen","doi":"10.1016/j.optmat.2025.117287","DOIUrl":"10.1016/j.optmat.2025.117287","url":null,"abstract":"<div><div>High-Power Impulse Magnetron Sputtering (HiPIMS) has been employed to prepare c-axis aligned crystalline indium-gallium-zinc oxide (CAAC-IGZO) thin films with negative substrate biasing. The chemical composition and crystal structure of the thin film are analyzed using X-ray Diffractometer (XRD) and Transmission Electron Microscope. Atomic Force Microscope is utilized to assess the surface roughness of the CAAC-IGZO thin films. In this study, annealing amorphous IGZO thin films at 1075 °C resulted in the formation of CAAC-IGZO with a smaller full-width at half-maximum in the XRD spectrum. The annealing process leads to the stratification of zinc oxide-based compounds, creating a three-layer structure: the top layer consists of zinc oxide, the middle layer is CAAC-IGZO, and the layer closest to the substrate is also zinc oxide. This phenomenon is explained theoretically by referring metal-induced crystallization and analyzing the changes in Gibbs free energy.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117287"},"PeriodicalIF":3.8,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517630","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":"Self-induced parabolic surface states","authors":"Damir V. Mitić ,&nbsp;Jadranka M. Vasiljević ,&nbsp;Dejan V. Timotijević ,&nbsp;Dragana M. Jović Savić","doi":"10.1016/j.optmat.2025.117249","DOIUrl":"10.1016/j.optmat.2025.117249","url":null,"abstract":"<div><div>We observed parabolic surface states during the nonlinear propagation of a Weber beams in an SBN crystal. The refractive index is modulated anisotropically using the optical induction technique. These states appear without the need for a pre-inscribed lattice in the material. Their characteristics can be tuned by adjusting the Weber beam’s scale, parabolicity, orientation, and power. We also observed oscillatory discrete surface states during the linear propagation of a probe Gaussian beam within the aperiodic Weber photonic lattice. In both cases, such specific parabolic states are observed as surface states extending across multiple adjacent parabolas, or edge parabolic states localized along the border parabola. Our approach presents the first demonstration of self-induced parabolic surface states in aperiodic systems.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117249"},"PeriodicalIF":3.8,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513564","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":"Revealing the mechanism of the cooling-process on the performance of liquid crystal physical gels","authors":"Jianjing Gao ,&nbsp;Nana He ,&nbsp;Yutong Zhang ,&nbsp;Ping Yu ,&nbsp;Zemin He","doi":"10.1016/j.optmat.2025.117281","DOIUrl":"10.1016/j.optmat.2025.117281","url":null,"abstract":"<div><div>The formation of liquid crystal physical gels (LCPG) involves cooling process in which the gelators form fibers network through intermolecular physical cross-linking. However, the intrinsic correlation between the electro-optical properties of LCPG and cooling rate has rarely been fully discussed. In this report, an LCPG was constructed using 4-Cyano-4′-pentylbiphenyl (5CB) as the liquid crystal and 1,3:2,4-di-<em>O</em>-m,p-dimethylbenzylidene-D-sorbitol (DMDBS) as the gelator to investigate the intrinsic relationship between the cooling process and the performance of LCPG. By quantitative analysis the performance and morphology of LCPG at different cooling rate, it can be observed that a lower cooling rate induces reaction-limited aggregation, which promotes gelator diffusion and yields a denser gel fiber network characterized by smaller pore size and a higher number of pores, for instance, the size and number are 37.61 μm and 330, respectively, in LCPG's POM image at 5 °C/min cooling rate, whereas that of LCPG at 25 °C/min cooling are 89.09 μm and 108. It will reduce the off-state transmittance and promote the improvement of contrast ratio (CR), but bring about increase in driving voltage due to the larger anchoring energy of the network. In addition, we confirmed the better direct-current driveability of LCPG. Our work reveals the factors affecting the cooling kinetics on the performance of LCPG, and provides a new theoretical basis and technical support for the LCPG preparation.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117281"},"PeriodicalIF":3.8,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517631","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":"The luminescence thermometer based on up-converting NaGdF4:Yb3+,Er3+@ZIF-8 nanoparticles","authors":"L.T.K. Giang ,&nbsp;T.Q. Tien ,&nbsp;W.M. Piotrowski ,&nbsp;M. Szymczak ,&nbsp;A. Opalińska ,&nbsp;W. Łojkowski ,&nbsp;L. Marciniak","doi":"10.1016/j.optmat.2025.117280","DOIUrl":"10.1016/j.optmat.2025.117280","url":null,"abstract":"<div><div>An upconversion luminescence nanothermometer based on NaGdF₄:Yb³⁺,Er³⁺@ZIF-8 nanoparticles, with an average size of approximately 289.5 nm and a polydispersity index of 24.85 %, was successfully synthesized via a hydrothermal route. The as-synthesized NaGdF₄:Yb³⁺,Er³⁺@ZIF-8 nanoparticles exhibit upconversion luminescence in both the visible and near-infrared regions under excitation within the first and second biological windows (NIR-I and NIR-II). Moreover, excitation in the NIR-I and NIR-II regions can be utilized to modulate the upconversion and downshifting emission of the NaGdF₄:Yb³⁺,Er³⁺@ZIF-8 nanoparticles. Temperature-dependent upconversion luminescence measurements revealed a satisfactory thermal response over a wide temperature range of 83–743 K. The maximum relative sensitivity achieved was 3.08 % K⁻¹ at 123 K, which is 5.1 times higher than that of the bare core α-NaGdF₄:Yb³⁺,Er³⁺ nanoparticles. The UV-VIS spectrum further confirmed the presence of the specific bonds of imidazole compounds on the synthesized core/shell NaGdF₄:Yb³⁺,Er³⁺@ZIF-8. Additionally, TEM/HRTEM images and SAED patterns recorded at different locations verified the presence of ZIF-8 shell layers on the surface of the α-NaGdF₄:Yb³⁺,Er³⁺ core nanoparticles.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117280"},"PeriodicalIF":3.8,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517629","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":"Femtosecond laser writing of S-curved dual-line waveguides in BGO crystal for mid-infrared band application","authors":"Lingqi Li ,&nbsp;Pengda Wang ,&nbsp;Lijuan Shi ,&nbsp;Weijin Kong ,&nbsp;Feng Chen","doi":"10.1016/j.optmat.2025.117283","DOIUrl":"10.1016/j.optmat.2025.117283","url":null,"abstract":"<div><div>We report on the fabrication of S-curved dual-line optical waveguides in cubic bismuth germanate (Bi₄Ge₃O₁₂, BGO) crystal using femtosecond laser direct writing. Three S-curved waveguides based on Type II configuration are successfully fabricated with lateral offsets of 50 μm, 100 μm, and 150 μm between their input and output ports. These waveguides are characterized at full-wavelength from visible to mid-infrared band (MIR), showing good guiding properties. The experimentally measured modal profiles of these S-curved waveguides show good agreement with simulation results at 4 μm. Bending losses for all curved waveguides are less than ∼1.6 dB/cm. Our work not only validates the feasibility of BGO-based waveguides for stable mid-infrared light transmission, but also establishes an effective approach for constructing broadband-integrated photonics circuits via laser-written crystalline waveguides.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117283"},"PeriodicalIF":3.8,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144510930","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":"Comparative study on visible-infrared and upconversion luminescence of Er3+,Yb3+ Co-doped La2Zr2O7 and Y2Zr2O7 phosphors for optical thermometry and latent fingerprint detection","authors":"B.V. Naveen Kumar ,&nbsp;R.E. Kroon","doi":"10.1016/j.optmat.2025.117274","DOIUrl":"10.1016/j.optmat.2025.117274","url":null,"abstract":"<div><div>This study presents a comprehensive comparison of the structural and optical characteristics of rare-earth activated La₂Zr₂O₇ (LZO) and Y₂Zr₂O₇ (YZO) phosphors, each being synthesized by both the combustion method (CMB) as well as the microwave hydrothermal (MHT) method. The structural characterization confirmed the successful formation of both compounds without impurity phases. The optical characterization studies, including photoluminescence (PL) under UV excitation and upconversion photoluminescence (UCPL) under 980 nm and 1550 nm laser excitation, reveal distinct luminescent properties. Under 378 nm excitation, both phosphor systems exhibit emissions spanning the visible (500–725 nm) and near-infrared (900–1600 nm) regions, with peak intensities at 545 nm, 980 nm, and 1530 nm. The UCPL results shows enhanced green emission for Er³⁺,Yb³⁺ co-doped LZO and red emission for Er³⁺,Yb³⁺ co-doped YZO upon 980 nm laser excitation. Under 1550 nm laser excitation, the Er³⁺-doped samples exhibit superior luminescence compared to Er³⁺,Yb³⁺ co-doped counterparts. Optical thermometry studies indicate that the LZO:Er³⁺,Yb³⁺ sample prepared by MHT method achieved a maximum absolute sensitivity of 54 × 10⁻⁴ K⁻¹ at 393 K and 30.7 × 10⁻⁴ K⁻¹ at 313 K for 980 nm, 1550 nm laser excitations, respectively. Similarly, the YZO:Er³⁺,Yb³⁺ sample prepared by the CMB method achieved a maximum absolute sensitivity of 22 × 10⁻⁴ K⁻¹ at 433 K and 17.2 × 10⁻⁴ K⁻¹ at 353 K for 980 nm, 1550 nm laser excitations, respectively. Besides optical thermometry studies, the brightest sample, LZO:Er³⁺,Yb³⁺ synthesized via MHT method, demonstrated strong green luminescence under 980 nm laser excitation, offering potential for latent fingerprint detection applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117274"},"PeriodicalIF":3.8,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144510934","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":"Applying the antireflection theory in designing of ultra-transparent WO3-based electrochromic films","authors":"Zerong Zhou ,&nbsp;Dandan Sun ,&nbsp;Wenxin Zhang ,&nbsp;Jiong Zhang","doi":"10.1016/j.optmat.2025.117279","DOIUrl":"10.1016/j.optmat.2025.117279","url":null,"abstract":"<div><div>In this study, the antireflection theory is used to design WO₃-based electrochromic films with ultra-high optical transmittance. The results show that transmittance of the films at wavelength of 550 nm could reach 90.08 % when the thickness of WO₃ film is 539 nm which is the highest among previous studies to our knowledge. And at this time, the films also shows good cyclic stability with only 13 % optical modulation rate loss and 31.54 % charge capacity loss after 1000 cycles. We believe that this research would provide a new insight into design of electrochromic films with ultra-high optical transmittance.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117279"},"PeriodicalIF":3.8,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489990","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 low concentrations of vanadium and titanium ions on the structural and optical properties of borophosphate glasses","authors":"I. Rashmi,&nbsp;Vasundhara Raghuvanshi,&nbsp;Avinash Ingle,&nbsp;H.D. Shashikala,&nbsp;H.S. Nagaraja","doi":"10.1016/j.optmat.2025.117271","DOIUrl":"10.1016/j.optmat.2025.117271","url":null,"abstract":"<div><div>A series of P₂O₅–B₂O₃–BaO glass system containing various V₂O₅ and TiO₂ content (from 0.25 to 0.75 mol%) were synthesized using the melt-quenching method to examine their structural, EPR, and optical characteristics. EPR analysis confirmed VO²⁺ hyperfine splitting and the presence of Ti³⁺ ions in a tetragonally compressed octahedral structure. The local structures of VO²⁺ and Ti³⁺ centers were explored through spin Hamiltonian parameters (<span><math><mrow><msub><mi>g</mi><mo>∥</mo></msub><mo>&lt;</mo><msub><mi>g</mi><mo>⊥</mo></msub><mo>&lt;</mo><msub><mi>g</mi><mi>e</mi></msub></mrow></math></span>) and optical transition energies. UV–visible spectroscopy revealed multiple oxidation states of vanadium (V³⁺, VO²⁺ and V⁵⁺) and titanium (Ti³⁺, Ti⁴⁺), which significantly influenced the optical characteristics. Photoluminescence (PL) studies indicated the presence of oxygen vacancies and intrinsic defects in the glass matrix, with [VO₄]^3- groups and Ti³⁺ ions significantly enhancing emission properties. The enhanced luminescence was observed for glasses with 0.75 mol% TiO₂ and 0.75 mol% V₂O₅. Notably, the 0.75 mol% V₂O₅-doped glass, exhibited CIE chromaticity coordinates (x = 0.26, y = 0.31), closely aligning with standard white light. The tunability of optical properties through transition metal oxide doping highlights the potential of these glasses for advanced photonic applications, including optical filters and display technologies.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117271"},"PeriodicalIF":3.8,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513566","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":"Transient response of low-temperature ALD-grown ZnO thin film-based p–i–n UV photodetector","authors":"Bhavya Padha ,&nbsp;Zahoor Ahmed ,&nbsp;Shankar Dutta ,&nbsp;Akhilesh Pandey ,&nbsp;Naresh Padha ,&nbsp;Isha Yadav ,&nbsp;Sandeep Arya","doi":"10.1016/j.optmat.2025.117264","DOIUrl":"10.1016/j.optmat.2025.117264","url":null,"abstract":"<div><div>This work presents an ultraviolet (UV) photodetector based on zinc oxide (ZnO) thin films grown via atomic layer deposition (ALD) technique on silica (SiO₂–Si) substrates in a p–i–n configuration (p-Si/i-SiO₂/n-ZnO). The ZnO films, deposited at 120 °C, exhibit a nanocrystalline structure with a dominant (110) orientation and a direct bandgap of 3.07 eV, indicating their suitability for UVA sensing (315–400 nm). The device exhibits a low dark current, high UV sensitivity, and stable, repeatable ON/OFF switching under 365 nm illumination at 0.05 mW cm⁻² at room temperature. I–V characteristics indicate efficient photocarrier transport. The dynamic response of the photodetector was measured at various bias voltages ranging from 0 V to 18 V. The sensitivity of the device was highest (1.17) at 0 V. At the same time, other parameters like responsivity (3.82 × 10² A W⁻¹), detectivity (7.14 × 10¹² Jones), external quantum efficiency (EQE) (1.3 × 10³ %) were found to be maximum at 18 V meanwhile the rise (0.3 s) and decay time (0.2 s) was minimum at this bias. These results demonstrate the potential of ALD–ZnO thin films for high-performance, room-temperature UV photodetectors, making them suitable for future integrated and wearable optoelectronics.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117264"},"PeriodicalIF":3.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144510931","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}