Optical Materials最新文献

{"title":"Synthesis of Graphite/SiOC composites film on silicon substrate: Insights into chemical composition, structural, morphological, electrical and optoelectronic properties","authors":"M'hamed Guezzoul ,&nbsp;Azzeddine Mokadem ,&nbsp;Hadjer Herir ,&nbsp;Youssef Larbah ,&nbsp;M'hammed Bouslama","doi":"10.1016/j.optmat.2025.117108","DOIUrl":"10.1016/j.optmat.2025.117108","url":null,"abstract":"<div><div>Graphite/SiOC composite (GSOC) thin films were synthesized on silicon substrates using an innovative “toast sandwich” method, where a silicon–graphite precursor mixture was deposited between two Si wafers and thermally treated at 350 °C to promote film adherence. The precursor solution was prepared directly from elemental silicon and graphite powders. A key challenge addressed in this work is the poor adhesion of polymer-derived SiOC on Si substrates—stemming from weak interfacial bonding strength and surface energy mismatch—which conventional deposition methods struggle to overcome. Our approach provides a simple and effective way to enhance film–substrate contact during thermal processing. The as-deposited GSOC films were further annealed at 1200 °C for 4 h, enabling compositional evolution and phase transformation. Structural, chemical, and functional properties were investigated using XRD, FTIR, XPS, AES, UPS, REELS, PL, and AFM. XRD confirmed the amorphous nature of the as-deposited film, while XPS and FTIR revealed the coexistence of Si–C and graphitic bonds. Annealing induced surface oxidation, leading to a transition from a carbon-rich (SiC-like) to an oxygen-rich (SiO₂-like) structure. REELS analysis indicated a bandgap widening from 8.1 eV (as-deposited) to 9.5 eV (annealed). UPS measurements showed a decrease in work function from 5.88 eV to 5.00 eV, and a shift in the Fermi level position from 3.72 eV to 5.56 eV (E_F–E_VBM). These changes reflect a transition from conductive to insulating behavior, as confirmed by Hall measurements showing a conductivity drop from 0.54 S/cm to 3.48 × 10⁻⁶ S/cm and carrier density reduction from 7.27 × 10¹⁷ to 2.64 × 10¹² cm⁻³. Photoluminescence analysis revealed SiC-like visible emission in the as-deposited film, while the annealed film demonstrated UV and violet emissions, suggesting potential use in advanced optoelectronic applications, particularly within the warm violet spectral range.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117108"},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923126","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":"Enhanced nonlinear harmonic generation in lithium niobate via composite core-shell nanoparticle functionalization","authors":"Qingtao Fang ,&nbsp;Ning Lu ,&nbsp;Xingjuan Zhao ,&nbsp;Xiaoli Sun ,&nbsp;Shengqiang Zhou ,&nbsp;Yuechen Jia ,&nbsp;Feng Chen","doi":"10.1016/j.optmat.2025.117133","DOIUrl":"10.1016/j.optmat.2025.117133","url":null,"abstract":"<div><div>Lithium niobate (LN) is an exceptionally promising photonic material for nonlinear frequency mixing due to its advantageous optical properties. The crucial challenge that remains unresolved is finding a straightforward and effective method to enhance its nonlinear optical harmonic generation. In this study, plasmonic Ag@AgCu core-shell nanoparticles (CSNPs) embedded in LN have been prepared through sequential ion irradiation. This approach not only introduces localized surface plasmon resonance (LSPR) but also enhances the nonlinear harmonic generation in LN, as evidenced by the significantly improved second harmonic generation (SHG), third-harmonic generation (THG), and <em>Z</em>-scan characterizations. We conduct a comprehensive analysis of the modulation in the linear and nonlinear optical properties of LN induced by embedded plasmonic CSNPs, demonstrating fairly-good agreement between experimental and simulation results. Furthermore, we discuss the formation mechanism of the CSNPs, highlighting the critical role of ion irradiation-induced heat, which facilitates the migration and aggregation of copper ions and oxygen vacancies within the LN matrix. Given the broad applicability of ion irradiation across various materials, the strategy presented here can be readily extended to a wider range of nonlinear materials, paving the way for the development of advanced nonlinear optical devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117133"},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913071","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-powered NiO/κ-Ga2O3 heterojunction photodiode for fast broadband ultraviolet (UV) radiation detection","authors":"A. Moumen ,&nbsp;P. Rajabi Kalvani ,&nbsp;F. Mattei ,&nbsp;G. Foti ,&nbsp;A. Parisini ,&nbsp;R. Mosca ,&nbsp;M. Pavesi ,&nbsp;M. Bosi ,&nbsp;L. Seravalli ,&nbsp;F. Mezzadri ,&nbsp;A. Baraldi ,&nbsp;P. Mazzolini ,&nbsp;S. Vantaggio ,&nbsp;A. Bosio ,&nbsp;R. Fornari","doi":"10.1016/j.optmat.2025.117125","DOIUrl":"10.1016/j.optmat.2025.117125","url":null,"abstract":"<div><div>A novel broadband p-n UV photodiode is presented, that integrates an ultrawide band gap n-type κ-Ga₂O₃ epitaxial film doped with silicon (Si) and a p-type NiO polycrystalline film, to provide a planar NiO/κ-Ga₂O₃ p-n heterojunction for UV detection applications. The proposed device features a circular design, with a diameter of 240 μm, resulting in compactness and functionality, and represents the first demonstration of broadband UV detection using planar NiO/κ-Ga₂O₃ photodiodes. It can be operated in self-powered mode, which allows UV detection without use of an external power supply. The p-n photodiode exhibits excellent sensitivity to UVC light and acceptable sensitivity to UVB and UVA radiations. However, the response to UVA light is still weak and requires further optimization of the diode design. Response and recovery time below 0.8 s were observed for all UV illumination range. The presented photodiode has a simple design and shows significant potential in high-performance broadband UV detection in self-powered operation.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117125"},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923127","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":"Performance investigation and optimization of EDFL based on Lithium Niobate–Titanium Oxide nanomaterial saturable absorber","authors":"Mustafa Mohammed Najm ,&nbsp;R.I. Mahdi ,&nbsp;Jassim K. Hmood ,&nbsp;Hiba H. Abdullah ,&nbsp;Ali H. Abdulhadi ,&nbsp;S.W. Harun","doi":"10.1016/j.optmat.2025.117118","DOIUrl":"10.1016/j.optmat.2025.117118","url":null,"abstract":"<div><div>In this research, we present an investigation of influence of output coupling ratio on the performance of a Q-switched erbium-doped fiber laser (EDFL). A new hybrid substance of a vinylidene fluoride-trifluoethylene P(VDF-TrFE) polymer with Lithium Niobate–Titanium Oxide nanomaterial [(Li_1.075Nb_0.625Ti_0.45O₃) to form, (P(VDF-TrFE)-LNTO) nanocomposite has been potentially worked as a saturable absorber (SA) in a Q-switched EDFL system at 1.55 μm region. This SA solid layer is successfully built using the drop-casting method to modulate cavity loss. The Q-switched process clearly performs consistently through reaching a remarkable signal-to-noise ratio (SNR) of 58 dB with output coupling ratio of 10:90. The pulses are built inside the laser cavity so that they would work efficiently with pump powers between 81 mW and 167 mW. The output power is between 1.96 mW and 4.07 mW, with 2.45 % slope efficiency. The laser cavity is operated at 1565.5 nm wavelength with a pulsing rate between 110.3 and 139.9 kHz and pulse width ranged from 3.32 to 1.98 μs. The results of our investigation indicate that a higher repetition rate with multi-wavelength laser pulses can be obtained with 50:50 OC. In contrast, the laser cavity with 90:10 OC achieves a narrower pulse width. Additionally, the experimental findings demonstrate that LNTO nanomaterial serves as a promising SA for development of Q-switched fiber lasers.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117118"},"PeriodicalIF":3.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913137","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":"Retraction notice to “Characterizing the properties of Li2O–B2O3–SiO2– P2O5–TiO2 glasses: A multidimensional investigation of their structure, optical properties, and gamma-ray shielding capability” [Opt. Mater. 151C (2024) 115351]","authors":"Khalid Alsafi ,&nbsp;Dalal Abdullah Aloraini ,&nbsp;Kh S. Shaaban","doi":"10.1016/j.optmat.2025.116864","DOIUrl":"10.1016/j.optmat.2025.116864","url":null,"abstract":"","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 116864"},"PeriodicalIF":3.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123744","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":"Rice husk-based silica: A structural and optical study of xerogel, amorphous, and crystalline phases","authors":"Agus Riyanto ,&nbsp;Silmi Machmudah ,&nbsp;Sri Yani Purwaningsih ,&nbsp;Suminar Pratapa","doi":"10.1016/j.optmat.2025.117115","DOIUrl":"10.1016/j.optmat.2025.117115","url":null,"abstract":"<div><div>This study reports the xerogel silica fabrication derived from rice husks via the sol-gel route, which was continued with conventional calcination to produce both amorphous and crystalline phases. The primary objective is to elucidate the relationship between their structural characteristics and optical properties, analyzed by adequate analytical procedures. The xerogel and amorphous phases exhibited many structural defects, characterized by an amorphous framework featuring n-membered rings (n = 3 or 4) and a non-solid morphology alongside an elevated specific surface area, with the xerogel notably enriched in silanol groups. In contrast, the crystalline phase exhibited a well-ordered structure predominantly composed of cristobalite and tridymite, characterized by solid morphology and the lowest structural defects. Structural defects and silanol groups are critical for forming emission centers, leading to significantly higher emission intensity in the xerogel compared to the amorphous and crystalline phases. The xerogel and amorphous phases exhibit maximum emission within the blue spectral region, whereas the crystalline phase shows its peak emission in the green spectral region. The observed shifts in emission peaks are likely influenced by the number of defects that act as emission centers within or on the surface of the samples. Additionally, variations in emission intensity correlate with significant differences in lifetime measurements, recorded at 392.37 ns, 4.08 ns, and 1.24 ns for the xerogel, amorphous, and crystalline phases, respectively.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"166 ","pages":"Article 117115"},"PeriodicalIF":3.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098940","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":"Coordination polymers of thiazolo[5,4-d]thiazoledicarboxylate with Sm(III) and Eu(III) for luminescent thermometry","authors":"Karolyne Santos da Silva ,&nbsp;Leonis Lourenço da Luz ,&nbsp;Severino Alves Junior ,&nbsp;Eduardo H. Lago Falcão","doi":"10.1016/j.optmat.2025.117120","DOIUrl":"10.1016/j.optmat.2025.117120","url":null,"abstract":"<div><div>Coordination polymers (CPs) with Sm³⁺ and Eu³⁺ ions and thiazolo[5,4-d]thiazolate (Thz²⁻) ligand were synthesized by the hydrothermal method, and their luminescence properties and thermal sensitivity were investigated. The compounds crystallize with the general formula[(Sm_1-xEu_x)₂(C₆N₂S₂O₄)₃·(H₂O)₈]·4H₂O, with x = 0.1 and 0.2. The compounds containing only Eu³⁺ and Sm³⁺ were also obtained. The analyses emphasized the distinct emission characteristics of Sm³⁺ and Eu³⁺, their energy transfer mechanisms, and their potential for application in luminescent thermometry. By understanding the photophysical processes, this work demonstrates the feasibility of designing efficient luminescent thermometers with high sensitivity over varying temperature range.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117120"},"PeriodicalIF":3.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143934972","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":"Investigation of structural, microstructural and optical properties of Ca3B2O6:Sm3+ downshifting phosphor","authors":"S.T. Mhashakhetri ,&nbsp;A.N. Yerpude ,&nbsp;C.M. Nandanwar ,&nbsp;A.V. Nande ,&nbsp;S.J. Dhoble","doi":"10.1016/j.optmat.2025.117121","DOIUrl":"10.1016/j.optmat.2025.117121","url":null,"abstract":"<div><div>The phosphor material, Ca₃B₂O₆:Sm³⁺ ions were synthesized using a combustion method and studied their structural, microstructural, surface and optical properties. The structural and microstructural analysis were performed using X-ray diffraction and Field Emission Scanning Electron microscope (FE-SEM). The surface analysis was studied using FTIR. The optical analysis was carried out using UV –absorption,and photoluminescence (PL) emission and excitation spectra, and decay time. Also, FTIR analysis confirmed the presence of bending vibration of the BO₃ group on its surface. Further, the estimated energy band of the host was found to be 5.43 eV.The PL Ca₃B₂O₆:Sm³⁺ phosphor exhibited distinct emission peaks observed at 566 nm, 602 nm, 651 nm, and 715 under excitation at 405 nm. Dexter's suggested the observed concentration quenching was due to the dipole-dipole interaction while the decay analysis depicted that the observed decay time was τ = 2.0108msfor Ca₃B₂O₆:Sm³⁺ phosphor. The results suggest that Ca₃B₂O₆: Sm³⁺ can be an efficient phosphor for producing red element in white light solid-state diodes.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117121"},"PeriodicalIF":3.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923122","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":"Retraction notice to “Comprehensive study of optical, thermal, and gamma-ray shielding properties of B2O3–SiO2–BeO– MgO–La2O3, glasses” [Opt. Mater. 150C (2024) 115298]","authors":"Khalid E. Alsafi ,&nbsp;Dalal Abdullah Aloraini ,&nbsp;Haifa M. Almutairi ,&nbsp;Shams A.M. Issa ,&nbsp;Hesham M.H. Zakaly ,&nbsp;Kh S. Shaaban","doi":"10.1016/j.optmat.2025.116867","DOIUrl":"10.1016/j.optmat.2025.116867","url":null,"abstract":"","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 116867"},"PeriodicalIF":3.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124988","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 new rare-earth borate Sr3Dy2(BO3)4 and tunable luminescence properties of Sr3Dy2-2xEu2x(BO3)4 phosphors","authors":"Xuean Chen ,&nbsp;Jiawen Ni ,&nbsp;Weiqiang Xiao ,&nbsp;Xiaoyan Song","doi":"10.1016/j.optmat.2025.117119","DOIUrl":"10.1016/j.optmat.2025.117119","url":null,"abstract":"<div><div>A new rare-earth borate Sr₃Dy₂(BO₃)₄ was obtained by high-temperature solution reaction at 950 °C and structurally characterized by single-crystal XRD for the first time. It crystallizes in the orthorhombic system (<em>Pnma</em> group, <em>Z</em> = 12) with cell parameters of <em>a</em> = 22.2265(3) Å, <em>b</em> = 15.8861(2) Å, <em>c</em> = 8.7096(1) Å, <em>V</em> = 3075.29(7) ų. The compound features a complex 3D framework constructed by (Dy/Sr)O_n (n = 7, 8, and 9) polyhedra and BO₃ planar triangles. Moreover, solid solutions of Sr₃Dy_2-2xEu_2x(BO₃)₄ (0 ≤ <em>x</em> ≤ 0.2) were prepared <em>via</em> the solid-state reaction route. The obtained products were characterized by powder XRD/Rietveld refinement, SEM/EDS, IR/Raman, XPS, DRS, and photoluminescence techniques. It was found that all samples were in the yellow-white light region under excitation at 351 nm. Among them, Sr₃Dy_1.6Eu_0.4(BO₃)₄ exhibits the CIE coordinates of (0.3292, 0.3536), close to the standard white-light illumination. When <em>λ</em>_<em>ex</em> = 394 nm, as the Eu³⁺ content varies from x = 0 to 0.2, the emission color of Sr₃Dy_2-2xEu_2x(BO₃)₄ can be adjusted from yellow-white (0.3280, 0.3834) to yellow-pink (0.5373, 0.3667). Thus, color-tunable and white emissions can be achieved by controlling the wavelength of the excitation light and the Eu³⁺/Dy³⁺ ratio. Meanwhile, the temperature-dependent analysis of Sr₃Dy_1.6Eu_0.4(BO₃)₄ proved the high thermal stability, with the emission intensity at 150 °C remaining &gt;75 % of its value at room temperature. These results indicate that Sr₃Dy_2-2xEu_2x(BO₃)₄ has the potential as a single-phase white-emitting phosphor for w-LED applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117119"},"PeriodicalIF":3.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923054","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}