Optical Materials最新文献

{"title":"Optical modeling of SiOx thin films for physicochemical property measurement by spectroscopic ellipsometry","authors":"Fangqi Ge ,&nbsp;Likun Wang ,&nbsp;Gaorong Han ,&nbsp;Yong Liu ,&nbsp;Sainan Ma","doi":"10.1016/j.optmat.2025.117044","DOIUrl":"10.1016/j.optmat.2025.117044","url":null,"abstract":"<div><div>Spectroscopic ellipsometry (SE) is widely recognized for measuring the optical parameters of thin films, and its potential for in-depth analysis attracts attention from both scientific and technological aspects. Here, an advanced optical modeling approach was proposed to extend SE to investigate the physicochemical properties of SiO_x thin films. Amorphous silicon oxide thin films (SiO_x, 0 ≤ x ≤ 2) were deposited via mid-frequency magnetron sputtering under varying oxygen partial pressures and sputtering powers. The Tauc-Lorentz model was first developed to extract the optical properties of amorphous silicon (a-Si) and SiO₂, then the Bruggeman Effective Medium Approximation (BEMA) model based on the derived optical constants (<em>n</em>, <em>k</em>) of a-Si and SiO₂ was further employed to reveal the structure and optical properties of SiO_x thin films. The SE results were simultaneously verified through profilometer, UV–vis–NIR spectrophotometer, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy, ensuring the accuracy and reliability of the modeling. Our work provides a theoretical and methodological foundation for advancing SE as a non-destructive in-situ technique, which is not only suitable for amorphous silicon oxide films but also for other non-stoichiometric thin films.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117044"},"PeriodicalIF":3.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826220","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 energy Q-switched Tm:Ho co-doped fiber laser based on gallium-doped zinc oxide nanoparticle as saturable absorber","authors":"Ahmed Shakir Al-Hiti,&nbsp;Bashayer Ismail Hamdallah,&nbsp;Shahad Hussam","doi":"10.1016/j.optmat.2025.117043","DOIUrl":"10.1016/j.optmat.2025.117043","url":null,"abstract":"<div><div>We demonstrated that Gallium Doped Zinc Oxide (Ga:ZnO) nanoparticles (NPs) can operate as saturable absorbers (SAs) in the 2 μm region. Casting and sonochemical methods fabricate Ga:ZnO NPs to form an absorber film. The laser system operates at 1959.42 nm with a 1.32 nm spectral bandwidth. The SA film generated a short pulse width of 1.57 μs with a repetition rate of 44.17 kHz, respectively. The laser system attained saturation intensity and modulation depth of 0.09 MW/cm² and 22 %. The proposed laser also achieved pulse energy and output power of about 5.7 mW and 129 nJ, respectively. This SA was used for the first time in laser applications, especially in the 2-μm region.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117043"},"PeriodicalIF":3.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826221","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":"Quantum dots-doped microlenses made by photolithography","authors":"Leila Issoufou Alfari ,&nbsp;J. Houel ,&nbsp;A. Belarouci ,&nbsp;H. Sahib ,&nbsp;S. Guy ,&nbsp;F. Lerouge ,&nbsp;M. Leocmach ,&nbsp;B. Mahler ,&nbsp;A. Gassenq","doi":"10.1016/j.optmat.2025.117028","DOIUrl":"10.1016/j.optmat.2025.117028","url":null,"abstract":"<div><div>Microlenses doped with quantum dot emitters offer promising potential for photonics applications, but they require complex fabrication. In this work, we present a method to fabricate microlenses incorporating core/shell CdSe/Cd_xZn_1-xS quantum dot red emitters using photolithography. The quantum dots were first synthesized and dispersed in propylene glycol monomethyl ether acetate solvent using suitable ligand exchange. This quantum dot-loaded solvent was then combined with a transparent commercial photoresist and patterned via ultraviolet lithography to create micro-disks with diameters ranging from 20 to 5 μm. The microstructures were then annealed, forming microlenses through the thermal reflow of the photoresist. Micro-photoluminescence and lifetime measurements confirm the homogeneous and efficient emission of the quantum dots within the microlenses. This work demonstrates the feasibility of fabricating microlenses doped with CdSe-based core/shell quantum dots through photolithography and thermal reflow, offering a straightforward approach for photonics applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117028"},"PeriodicalIF":3.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847982","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":"Growth and optical spectroscopy study of low-temperature phase of La0.99Pr0.01Sc3(BO3)4 crystal","authors":"T.A. Igolkina ,&nbsp;E.P. Chukalina ,&nbsp;A.B. Kuznetsov ,&nbsp;K.A. Kokh ,&nbsp;S.A. Klimin ,&nbsp;V.N. Denisov ,&nbsp;K.N. Boldyrev ,&nbsp;M.N. Popova","doi":"10.1016/j.optmat.2025.117040","DOIUrl":"10.1016/j.optmat.2025.117040","url":null,"abstract":"<div><div>La_0.99Pr_0.01Sc₃(BO₃)₄ single crystals were grown by top-seeded solution growth method using LiBO₂–LiF flux. Wide-range high-resolution absorption and luminescence spectra of the grown crystals at different temperatures were registered in linearly polarized light. The crystal-field level diagram for the ³H_4,6, ³F_2,3,4, ¹G₄, ¹D₂, ³P_0,1,2, and ¹I₆ multiplets of the Pr³⁺ ion in LaSc₃(BO₃)₄:Pr³⁺ was constructed for the first time. A monoclinic structure of the crystal (space group <em>Cc</em>) was determined using X-ray diffraction and optical methods. IR reflectance and Raman spectra clearly reveal the contribution of BO₃ molecular groups. Weak satellites of the absorption lines were observed and explained by transitions in Pr³⁺ ions located near antisite defects (i.e. Ln³⁺ ions in octahedral sites instead of Sc³⁺, and Sc³⁺ in Ln³⁺ sites) formed during the crystal growth.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117040"},"PeriodicalIF":3.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826222","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":"Fabrication of PZT-Au composite films via Aerosol Deposition for real-time tunable optical modulators","authors":"Jongwoo Lim ,&nbsp;Yeongjin Kim ,&nbsp;Jun Akedo ,&nbsp;Hak Ki Yu ,&nbsp;Jae-Young Choi ,&nbsp;Jae-Hyuk Park","doi":"10.1016/j.optmat.2025.117041","DOIUrl":"10.1016/j.optmat.2025.117041","url":null,"abstract":"<div><div>In this study, we successfully fabricated PZT-Au composite films using the Aerosol Deposition (AD) method and demonstrated their potential as real-time tunable optical modulators. By integrating gold nanoparticles into the PZT matrix, we achieved dynamic control of plasmonic absorption and optical modulation under applied electric fields. The AD method enabled room-temperature deposition of dense films with uniformly distributed Au nanoparticles. Post-annealing, the Au particles recovered their spherical shape, enhancing plasmonic absorption and improving optical transparency. A relative transmittance change of 41 % at 780 nm was observed when increasing the voltage from 30 V to 150 V, along with a 50 nm redshift attributed to electric-field-induced refractive index changes in the PZT matrix. Furthermore, under a 10 MHz alternating electric field, the films exhibited periodic modulation of transmittance, confirming their capability for high-speed, real-time optical response. These results demonstrate the promise of PZT-Au composites for next-generation tunable electro-optic devices and sensors.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117041"},"PeriodicalIF":3.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821490","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":"Extended study of crystal structures, optical properties and vibrational spectra of polar 2-aminopyrimidinium hydrogen phosphite and three centrosymmetric salts - bis(2-aminopyrimidinium) sulfate monohydrate and two 2-aminopyrimidinium hydrogen sulfate polymorphs","authors":"Irena Matulková ,&nbsp;Ladislav Bohatý ,&nbsp;Petra Becker ,&nbsp;Ivana Císařová ,&nbsp;Róbert Gyepes ,&nbsp;Michaela Fridrichová ,&nbsp;Jan Kroupa ,&nbsp;Petr Němec ,&nbsp;Ivan Němec","doi":"10.1016/j.optmat.2025.117033","DOIUrl":"10.1016/j.optmat.2025.117033","url":null,"abstract":"<div><div>This study aimed primarily at completing and extending the characterization of the crystallographic, spectroscopic and optical properties of polar, biaxial, optically negative 2-aminopyrimidinium(1+) hydrogen phosphite. Besides the redetermination of the low-temperature crystal structure (space group <em>P</em>2₁), high-quality single crystals of this salt were grown from an aqueous solution, and their optical properties were studied. The determination of the refractive indices in the wavelength range of 435–1083 nm showed anomalous dispersion of the refractive indices, resulting in a point of uniaxiality. The crystal allows phase matching for collinear second harmonic generation (SHG) processes of both type I and type II in a broad wavelength range. SHG properties were studied for powdered size-fractioned samples and oriented single-crystal cuts. The optical damage threshold experiments confirmed excellent optical resistance - at least 220 TWm⁻² and 70 TWm⁻² for 800 and 1000 nm irradiation, respectively. The low-temperature crystallographic study was also extended for three monoclinic salts of 2-aminopyrimidine and sulfuric acid - i.e. bis(2-aminopyrimidinium(1+) sulfate monohydrate (space group <em>P</em>2₁/<em>n</em>) and two polymorphs of 2-aminopyrimidinium(1+) hydrogen sulfate (both with space group <em>P</em>2₁/<em>c</em>). The vibrational spectra of all title compounds were assigned using single-molecule quantum chemical computations (including Potential Energy Distribution analysis) in combination with the nuclear site group analysis. Spectroscopic results concerning sulfates of 2-aminopyrimidine provided valuable “reference” materials for the vibrational spectroscopic study and also addressed the question of their polymorphism. An optimal computational approach employing solid-state DFT calculations has also been sought to model the vibrational spectra of 2-aminopyrimidinium (1+) hydrogen phosphite crystals.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117033"},"PeriodicalIF":3.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870760","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":"Digitalized light driven photo-responsive liquid crystals for high resolution and full gamut passive displaying","authors":"Zhili Zhang ,&nbsp;Fuyu Zhang ,&nbsp;Keyang Zhao ,&nbsp;Pengfei Mo ,&nbsp;Wenbin Huang ,&nbsp;Xiaohong Zhou ,&nbsp;Yanyan Huang ,&nbsp;Zhongwei Yu","doi":"10.1016/j.optmat.2025.117039","DOIUrl":"10.1016/j.optmat.2025.117039","url":null,"abstract":"<div><div>Photo-responsive cholesteric liquid crystal (CLC), as one of effective materials for rewritable paper, contributes to energy saving and sustainable development through their tunable pitch and passive display characteristics. In this study, a high-resolution passive display canvas with full-color gamut tunability was presented, which was attributed to the introduction of a binary chiral dopant system enabling the CLC's tunable spectrum to cover the entire visible range. Due to the ultrafast interaction between the photo-responsive CLC and the digitalized light field, multidimensional regulation of the photo-responsive material in any region could be achieved, resulting in excellent resolution performance. Additionally, by controlling the exposure dosage and exposure time of digitalized light, precise modulation of the spectrum was also realized. The ideal resolution achieved in our system is approximately 80 μm, supporting the repeated rewriting of intricate multicolor patterns with a color gamut spans nearly the entire visible spectrum, ranging from 420 nm to 730 nm. By harnessing the photo-responsive properties of CLCs and the precision of digitalized light fields, we not only validated the feasibility of high-resolution and full-gamut passive displaying, but also provided a platform for the study of the microscopic interaction between the light field and photosensitive liquid crystals.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117039"},"PeriodicalIF":3.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847983","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":"Controllable random lasers from dye-doped liquid crystal with plasmonic silver nanostructures","authors":"Lihua Ye ,&nbsp;Qingfen Ma ,&nbsp;Ziang Zhang ,&nbsp;Yanqing Lu ,&nbsp;Bing Gu","doi":"10.1016/j.optmat.2025.117038","DOIUrl":"10.1016/j.optmat.2025.117038","url":null,"abstract":"<div><div>In this paper, the random lasers from Dye-Doped Nematic Liquid Crystals (DDNLC) with silver nanostructures of different shapes are investigated. The single-step polyol-solvothermal synthesis strategy is used to obtain the different silver nanostructures by controlling the reaction pressure with the help of silver amount and halide ions. These silver nanostructures are respectively named silver nanowires (Ag NWs), irregularly shaped silver nanoparticles (Ag NPs), silver nanospheres (Ag NSs) and silver nanocubes (Ag NCs). The investigations reveal that all silver nanostructures have intensive enhanced spectral effect due to localized surface plasmon resonance (LSPR), while the best random lasing properties are noticed in Ag NCs doped in DDNLC. This is because Ag NCs exhibit broad absorption spectrum that sufficiently overlaps with both absorption and emission of dye PM597. In addition, the sharp features of Ag NCs tend to increase charge separation and provide stronger local electric field. When the size increases from 36 nm to 144 nm, Ag NCs with a size of 99 nm achieve the lowest threshold (1.7 mJ/cm²) and the highest intensity of random laser emission because of a balance between enhanced local electric field and scattering. The random lasing in silver nanostructures doped in DDNLC is predicted to be applied in sensing and integrated photonic devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117038"},"PeriodicalIF":3.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829590","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 self-powered UV photodetection performance of Zn2SnO4/polyaniline based heterojunction","authors":"Songchi Liao,&nbsp;Chengfeng Wang,&nbsp;Huan He,&nbsp;Yuechun Fu","doi":"10.1016/j.optmat.2025.117032","DOIUrl":"10.1016/j.optmat.2025.117032","url":null,"abstract":"<div><div>Inorganic/organic self-powered UV photodetectors based on Zn₂SnO₄/polyaniline (PANI) heterojunction are investigated in this study. Zn₂SnO₄ microspheres were synthesized by the hydrothermal method, and PANI was directly polymerized on Zn₂SnO₄ microspheres to form Zn₂SnO₄/PANI (ZP) compounds. The photodetectors constructed by n-Zn₂SnO₄/p-ZP heterojunction show excellent self-powered behavior with good stability and repeatability under UV light illumination. In particular, the device based on Zn₂SnO₄/ZP-30 displays the high photocurrent (10.805 μA), responsivity (251.279 mA W⁻¹) and detectivity (1.629 × 10¹² Jones) at zero bias. The favorable bandgap difference and structure are contributed to separate and transport photogenerated carriers rapidly and thus enhance its photoresponse performances.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117032"},"PeriodicalIF":3.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799351","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":"An Impact of the Aryl Substituent in Position 4 of Dicyanopyridines on Efficiency of Thermally Activated Delayed Fluorescence and Electroluminescence","authors":"Pavel Arsenyan ,&nbsp;Brigita Vigante ,&nbsp;Ehsan Ullah Rashid ,&nbsp;Karolis Leitonas ,&nbsp;Dmytro Volyniuk ,&nbsp;Pavels Dimitrijevs ,&nbsp;Juozas Vidas Grazulevicius","doi":"10.1016/j.optmat.2025.117027","DOIUrl":"10.1016/j.optmat.2025.117027","url":null,"abstract":"<div><div>Our research is on the side modification of the compound exhibiting efficient thermally activated delayed fluorescence (TADF) by different aryl acetylene moieties. The modification results in the synthesis of unique 2,6-bis-(3,6-di-tert-butyl-carbazol-9-yl)-4-[4-(4-substituted ethynyl) phenyl]-pyridine-3,5-dicarbonitriles. Organic light-emitting diodes with these compounds exhibit a wide range of external quantum efficiencies from 9.8 to12.5 to 17.3%. This wide variation in efficiency, which even surpassed that of the device with the reference emitter, is primarily attributed to the significant influence of the aromatic acetylenes on the TADF properties of the compounds. The presence of ferrocene moiety results in completely quenched emission of the compound. The attachment of phenyl ethynyl group induces efficient TADF due to the narrowing of singlet-triplet energy gap (ΔE_ST) down to 0.07 eV. The spatial alignment of the singlet and triplet states is studied by quantum chemical computations demonstrating the effect of the modifications on the reduction of ΔE_ST values. It is shown that the different efficiency of reverse intersystem crossing is caused by the different spin-orbit coupling values between singlet and triplet states. The proposed acetylene modifications offer a chemical approach to finely tune TADF properties and control conformer formations of donor-acceptor type emitters in the solid state, providing a practical tool for the future research and applications of TADF emitters.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 117027"},"PeriodicalIF":3.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808547","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}