Optical Materials最新文献

{"title":"Fabrication and characterization of FTO/C–TiO2/M-TiO2/CH3NH3PbI3/Spiro-MeOTAD/Au perovskite solar cell: Effect of moisture on stability and study of noise spectroscopy","authors":"Amrit Kumar Mishra ,&nbsp;Vijay Kumar Mishra ,&nbsp;Rajesh Kumar Shukla","doi":"10.1016/j.optmat.2025.117016","DOIUrl":"10.1016/j.optmat.2025.117016","url":null,"abstract":"<div><div>This study reports the fabrication of an FTO/C–TiO₂/M-TiO₂/CH₃NH₃PbI₃/Spiro-MeOTAD/Au perovskite solar cell and investigates its stability under various environmental conditions. The degraded perovskite layer is shown to be recoverable under high humidity in dark conditions. A 15 % RH nitrogen (N₂) flow effectively removes oxygen (O₂) and water (H₂O) molecules from the Spiro-MeOTAD/perovskite interface, enabling rapid recovery of the interface and enhancing the device's current density. The perovskite material exhibits temperature-dependent stability, achieving an efficiency of 20.24 % at 300 K with a fill factor of 86.88 %, J_SC of 24.77 mA/cm², and V_OC of 0.94 V. High humidity induces trap states, lowering the photocurrent, whereas low humidity stabilizes the material. The 1/f noise measurements reveal critical insights into defect states in the perovskite layer: high humidity correlates with reduced noise, while low humidity leads to increased noise levels. The effects of humidity, temperature, UV light, and white light on defect states are further analyzed using 1/f noise spectra and I–V characteristics under white light illumination and dark conditions.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117016"},"PeriodicalIF":3.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783927","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":"Electrically tunable dual-band extraordinary transmission with a graphene hybrid metasurface","authors":"Yujing Zhang,&nbsp;Jiameng Nan,&nbsp;Weiqi Cai,&nbsp;Jing Xu,&nbsp;Hongkui Shi,&nbsp;Fuli Zhang,&nbsp;Yuancheng Fan","doi":"10.1016/j.optmat.2025.117014","DOIUrl":"10.1016/j.optmat.2025.117014","url":null,"abstract":"<div><div>Metasurface is a kind artificial composite composed of subwavelength structures arranged for novel optical properties. Here we propose and demonstrate a metasurface made of hybrid metal-graphene structure for electrically tunable dual-band electromagnetic extraordinary optical transmission (EOT). Considering the tunability of the conductivity of graphene with applied voltage as well as the freely designed EOT operating in independent frequency bands, the transmission of the dual-band EOT can be efficiently controlled by tuning the biasing voltage on the graphene layer. The electrical tunability of the dual-band EOT behavior is confirmed by full-wave simulation and experimental characterization. The measured results show that the designed metasurface achieves 57.6 % and 32.2 % transmittance at 9.49 GHz and 11.47 GHz, respectively, and 45.7 % and 28 % modulation are achieved when the graphene is biased. The proposed hybrid metasurface enriches the modulation mechanism of electromagnetic EOT behavior through tunable properties of graphene and has certain application prospects in sensors and filter devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117014"},"PeriodicalIF":3.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747965","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":"SiO2 fluorescent nanofiber film incorporating Eu3+-doped for inorganic red light-emitting diode","authors":"Leixuan Li,&nbsp;Yanxin Wang,&nbsp;Wei Xing,&nbsp;Xiaotong Zhang,&nbsp;Hanwen Wang,&nbsp;Huiyi Wu,&nbsp;Jian Wang,&nbsp;Linjun Huang,&nbsp;Jianguo Tang","doi":"10.1016/j.optmat.2025.117009","DOIUrl":"10.1016/j.optmat.2025.117009","url":null,"abstract":"<div><div>Recently, the application of rare earth elements in LEDs has attracted widespread attention. This article conducts in-depth research on rare earth fluorescent nanofiber membrane materials. Firstly, Eu³⁺, 2-thenoyltrifluomacetonate (tta), and 1,10-phenanthroline (Phen) undergo a complexation reaction to form the Eu(tta)₃Phen complexes. The highly efficient fluorescent hybrid material SiO₂@Eu(tta)₃Phen prepared by using a straightforward doping method to mix the Eu(tta)₃phen complexes with synthetic silica nanoparticles. Fluorescent nanofiber membranes that emit uniform red light was prepared by loading SiO₂@Eu(tta)₃Phen onto PVA nanofiber membrane (PNM) and SiO₂ nanofiber film (SNF) by filtration. After calculation, the loading amount of FSNF and FPNM were 55.6 % and 38.4 %, respectively. It was found that SiO₂ fluorescent nanofiber film (FSNF) had better fluorescence performance than PVA fluorescent nanofiber membrane (FPNM) under excitation at 384 nm wavelength. FSNF and FPNM were applied to LED components, both of which exhibited excellent fluorescence. The chromaticity coordinate (x, y) of FSNF is (0.6545, 0.3418), the correlated color temperature (CCT) is 1000K. The chromaticity coordinate (<em>x</em>, <em>y</em>) of FPNM is (0.6496, 0.3396), with a correlated color temperature (CCT) of 1000K. However, FSNF has a significant improvement in the persistence of ultraviolet irradiation compared to FPNM. These findings demonstrate that the developed FSNF have tremendous potential in white LEDs.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117009"},"PeriodicalIF":3.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739009","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 and modulated ∼2.9 μm mid-infrared emission of Ho3+/Pr3+: LiYF4 single crystal by co-doping non active Lu3+ ions","authors":"Yi Shi ,&nbsp;Lizhi Fang ,&nbsp;Haiping Xia ,&nbsp;Hongwei Song ,&nbsp;Baojiu Chen","doi":"10.1016/j.optmat.2025.117008","DOIUrl":"10.1016/j.optmat.2025.117008","url":null,"abstract":"<div><div>A hitherto undeveloped Pr³⁺/Ho³⁺: LiYF₄ single crystal by introducing non-active Lu³⁺ ions was synthesized by a reformative Bridgman technique. The crystalline phases and optical properties of the crystals were characterized using various methods, including absorption spectra, X-ray diffraction (XRD), Rietveld refinement, emission spectra, and lifetimes. The band gaps of Ho³⁺/Pr³⁺: LiYF₄ (Ho³⁺/Pr³⁺: LYF) and Ho³⁺/Pr³⁺/Lu³⁺: LiYF₄ (Ho³⁺/Pr³⁺: LLYF) single crystal were calculated by density functional theory, the value is ∼7.902 eV and ∼7.692 eV, respectively. The ∼2.9 μm emission intensity significantly increased about two times when Lu³⁺ (3.0 mol%) was added to 0.1Pr³⁺/0.5Ho³⁺: LiYF₄single crystal due to the disruption of [Ho³⁺-Ho³⁺] quenching clusters formed by Ho³⁺ ions. The maximum emission cross section of 0.1Pr³⁺/0.5Ho³/3.0Lu³⁺: LiYF₄ single crystal was ∼22.7 × 10⁻²¹ cm². The doping of Lu³⁺ ions reduced significantly the lifetime of ⁵I₇ energy level and mitigates effectively the self-termination phenomenon. Thus, the incorporation of Pr³⁺/Ho³⁺/Lu³⁺ into LiYF₄ single crystal represented a promising choice for a laser gain medium operating at ∼2.9 μm, as well as for other optoelectronic devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117008"},"PeriodicalIF":3.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739132","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":"Effect of Sn on the structural, morphological and optical properties of liCoPO4","authors":"Mohamed S.I. Koubisy ,&nbsp;Wael Mohammed ,&nbsp;Fatemah H. Alkallas ,&nbsp;Amira Ben Gouider Trabelsi ,&nbsp;Shoroog Alraddadi ,&nbsp;Abdelaziz M. Aboraia","doi":"10.1016/j.optmat.2025.116977","DOIUrl":"10.1016/j.optmat.2025.116977","url":null,"abstract":"<div><div>In the presented work, the influence of Sn doping on structural, morphological, and optical properties is systematically investigated. In this regard, in order to overcome such drawbacks, Sn was incorporated into the LiCoPO₄ matrix through a solid-state synthesis route by varying the Sn concentration from 0 to 8 mol%. XRD recorded the structural changes upon Sn doping, which indicated that Sn incorporation did not change the LiCoPO₄ primary orthorhombic olivine structure, though inducing minor changes in the lattice parameters due to the radius difference between Sn⁴⁺ and Co²⁺. TEM studies were performed to investigate the morphological properties. The optical properties were studied by UV–Vis spectrophotometer and showed a gradual decrease of the optical bandgap with increasing Sn content, the highest bandgap (3.94 eV) was obtained for x = 0 of Sn while the lowest value of band gap (3.64) was obtained for x = 0.08 of Sn. The refractive index decreased with an increase in the concentrations of Sn, 1.8 to 1.6 respectively. The non-linear absorption coefficient increases with Sn doping. Thus, these findings provide a new route to modify the properties of LiCoPO₄ for energy storage and also manifest Sn as a potential dopant for enhancing the performances of transition metal phosphates, particularly in various technological uses. This study therefore paves the way for further optimization of LiCoPO₄ and similar materials for high-performance batteries and other functional devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116977"},"PeriodicalIF":3.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747962","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":"Optical spectroscopy of exchange-coupled ions: Insights into homonuclear, heteronuclear and mixed transition-metal/rare-earth systems","authors":"Diego Pérez-Francés ,&nbsp;Fernando Rodríguez ,&nbsp;Rafael Valiente","doi":"10.1016/j.optmat.2025.116965","DOIUrl":"10.1016/j.optmat.2025.116965","url":null,"abstract":"<div><div>In 1988, McCarthy and Güdel published the seminal review <em>Optical Spectroscopy of Exchange-Coupled Transition Metal Complexes</em>, which not only compiled key spectroscopic results but also provided a deep insight into the theoretical foundations of the field, originally developed by Tanabe in the 1960s, which is undoubtedly the most insightful review in this topic to date. The work presented here aims to pay a modest tribute to Prof. Hans U. Güdel for his outstanding contributions and career — a scientist who was a guiding figure for many of us entering the field of spectroscopy. This review provides an updated overview of key experimental findings where exchange-coupled systems play a fundamental role, many of which involved direct contributions from Prof. Güdel himself. We begin by discussing homonuclear transition-metal systems, such as Mn<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>–Mn<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span> and Mn<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>–Mn<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> pairs, highlighting the unique features of their absorption and emission spectra, as well as their lifetimes — phenomena that are not observed in isolated ions. The discussion then extends to heteronuclear mixed-metal systems, specifically transition-metal/rare-earth ion pairs, such as Mn<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>–Yb<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>. In these systems, a novel upconversion luminescence mechanism was proposed, based on exchange interaction via the Tanabe mechanism between Yb<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> and Mn<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>. Significant enhancement of optical absorption and its temperature dependence was attributed to Mn<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>–Cu<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span> exchange interaction units. Finally, we compare results from two Ni<span><math><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>-doped isostructural materials — Rb<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>CdCl<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> and Rb<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>MnCl<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> — emphasizing the potential of exchange coupling mechanism to enhance luminescence efficiency.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116965"},"PeriodicalIF":3.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739011","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":"Impact of bismuth substitution on the structural and optical properties of lanthanum orthoferrite synthesized via sol-gel method","authors":"Ahmed Belguenoune ,&nbsp;Nadir Ouldhamadouche ,&nbsp;Salah Bassaid ,&nbsp;Abdelkader Dehbi ,&nbsp;Abdallah Ben Rhaiem","doi":"10.1016/j.optmat.2025.117010","DOIUrl":"10.1016/j.optmat.2025.117010","url":null,"abstract":"<div><div>This study explores the structural, linear, and nonlinear optical properties of lanthanum orthoferrite (LaFeO₃) and the impact of bismuth (Bi) substitution at the A-site in varying concentrations (0.05, 0.1, and 0.15) on these properties. The La_1-xBixFeO₃ samples were synthesized via the sol-gel method using citric acid as a complexing agent. Structural characterization was conducted using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). XRD analysis confirmed the formation of a perovskite phase with an orthorhombic structure (Pbnm space group), while Rietveld refinement provided precise crystallographic and geometric parameters. FTIR spectra verified the phase purity, revealing no detectable carboxyl or hydroxyl functional groups, indicating the absence of carbonates and minimal hygroscopicity. UV–visible spectroscopy was employed to assess absorbance and reflectance spectra, Which indicated enhanced absorption in the visible region upon doping. The calculated linear optical parameters stated an increase in bandgap energy from 2.045 eV to 2.139 eV with increasing Bi content, accompanied by a reduction in Urbach energy. Furthermore, Bi-doped samples exhibited anomalous dispersion behavior in the refractive index, in contrast to the normal dispersion observed in undoped LaFeO₃. Dielectric properties, optical performance, and electrical conductivity were also improved upon Bi incorporation. The nonlinear optical analysis, including third-order nonlinear susceptibility (χ(3)) and nonlinear refractive index—enables, revealed that pristine LaFeO₃ exhibited superior optical characteristics compared to Bi-doped samples.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117010"},"PeriodicalIF":3.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760401","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":"Unveiling improvements in structural, optical, and photodetection characteristics of CZTS thin films through Ag-doping","authors":"Fazal Rehman ,&nbsp;Salih Yılmaz ,&nbsp;İsmail Polat ,&nbsp;Emin Bacaksız ,&nbsp;Recep Zan ,&nbsp;Mehmet Ali Olgar","doi":"10.1016/j.optmat.2025.117006","DOIUrl":"10.1016/j.optmat.2025.117006","url":null,"abstract":"<div><div>The study investigated the characterization of photodetectors made from CZTS (Cu₂ZnSnS₄) thin films by introducing silver (Ag) as a dopant. CZTS thin films were grown on Mo-foil by two stage process, comprising sputter deposition of metallic precursor layers followed by sulfurization process employing Rapid Thermal Annealing (RTA) approach. The stacking order for the undoped and Ag-doped CZTS thin films were Substrate/ZnS/Cu/Sn/Cu and Substrate/ZnS/Cu/Sn/Cu/Ag, respectively. Photodetectors (PDs) were fabricated using sputter deposition on glass, including CZTS, Ag-doped CZTS-5 (8 nm Ag), Ag-doped CZTS-10 (16 nm Ag), and Ag-doped CZTS-15 (24 nm Ag). Various characterization methods were utilized to examine the prepared thin films, including Energy Dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy, Scanning Electron Microscopy (SEM), optical transmission, Photoluminescence (PL) and photodetection analyses. Among all devices, Ag-CZTS-10 PDs exhibited the best performance, showing a crystallite size (<em>D</em>) of 51.72 nm, band gap of 1.47 eV and favorable SEM surface morphology. For the photodetection characteristics, blue light at 443 nm and red light at 525 nm wavelength were used with an applied bias of 2V, and a light intensity of 17.3 mW/cm². The highest responsivity (R) values recorded for Ag-CZTS-10-based PDs were 0.0024 A/W for blue and 0.0019 A/W for red light. Additionally, the detectivity (D∗) was 3.4 × 10⁶ Jones for blue and 2.3 × 10⁶ Jones for red light, while sensitivity (S) was 26 % for blue and 15 % for red light. This study successfully demonstrated, for the first time, the fabrication of low-cost, high-performance Ag-doped CZTS films-based PDs on glass substrates which hold promise for the development of cost-effective and efficient optoelectronic devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117006"},"PeriodicalIF":3.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747964","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 photocatalytic performance of CeO2/ZnO/TiO2 nanocomposite: Role of reduced bandgap and core-shell heterojunction morphology","authors":"S.M. Fathima Khyrun ,&nbsp;A. Jegatha Christy ,&nbsp;Suresh Sagadevan","doi":"10.1016/j.optmat.2025.116990","DOIUrl":"10.1016/j.optmat.2025.116990","url":null,"abstract":"<div><div>Photocatalysis under the visible light irradiation is an economically viable technique for addressing environmental contaminants. A ternary nano-photocatalyst, CeO₂/ZnO/TiO₂ (CZT-TNPC), was synthesized using the solution combustion method. XRD analysis has confirmed the crystallinity and the formation of distinct CeO₂, ZnO, and TiO₂ phases, with the average crystallite size and band gap calculated as 22.76 nm and 2.62 eV, respectively. The FTIR analysis has revealed the presence of metal-oxygen bonds at 501 cm⁻¹. Photoluminescence (PL) studies have indicated a lower recombination rate of charge carriers, contributing to enhanced photocatalytic activity. Raman analysis further verified the structural properties and interaction between the oxide phases, essential for the heterojunction formation. SEM images have exhibited spherical-floret morphology, while EDAX confirmed the elemental composition of the nanocomposite. HRTEM micrographs showed the core-shell heterojunction nanostructure of CZT-TNPC, and the SAED pattern has depicted its polycrystalline nature and growth direction. The CZT-TNPC nanocomposite demonstrated significant antibacterial activity, with an inhibition zone of approximately 18 mm. Photocatalytic studies for Methylene Blue (MB) dye degradation under visible light irradiation have resulted with a maximum degradation efficiency of 97.02 % at 90 min, following pseudo-first-order kinetics. The enhanced photocatalytic performance is attributed to the reduced band gap, core-shell heterojunction morphology, and efficient charge separation.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116990"},"PeriodicalIF":3.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760400","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":"Optical properties of one-dimensional porous silicon photonic crystals coated with a thin nickel film","authors":"Danilo Roque Huanca","doi":"10.1016/j.optmat.2025.116991","DOIUrl":"10.1016/j.optmat.2025.116991","url":null,"abstract":"<div><div>The surface of the one-dimensional porous silicon photonic crystal was modified by depositing a thin nickel layer with a nominal thickness of 80 nm. Optical characterization, performed via reflectance spectrum simulation and experimental measurements, demonstrated that the sequence of unit cells in the uppermost layers significantly affects the morphological characteristics of the porous structure. This effect leads to the formation of layers with inhomogeneities in thickness and porosity. After nickel deposition, fitting analysis employing the transfer matrix method revealed that photonic devices with low porosity and smaller pores in their first upper layer exhibit higher reflectance at the wavelength below the photonic band gap center, along with a narrower photonic band gap. This enhancement is attributed to the reflectance contribution of the relatively thin nickel film formed by the partial sealing of the small pores. In contrast, devices with greater porosity and larger pores exhibit suppressed photonic band gaps, making the photonic structure highly effective as an absorptive material. After thermal treatment, a partial recovery of the reflectance and the shape of the photonic band was observed. This recovery was more pronounced on the left edge, reaching approximately 80 % in the device with high porosity in their initial layer, while those with low porosity reach only around 40 % recovery.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116991"},"PeriodicalIF":3.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734986","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}