Article
Physics, Applied
Hiroki Fukuda, Akira Nagakubo, Hirotsugu Ogi
Summary: Elastic constants and sound velocities of thin films are crucial for acoustic filters design, but difficult to measure for dielectric thin films. A three-layer structure with a dielectric nano-thin film sandwiched between thicker metallic films was used to measure the longitudinal elastic constant. Despite a smaller value at room temperature, the elastic constant of NiO approaches bulk value as deposition temperature increases, with Pt film uncertainty insignificantly affecting accuracy.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
H. E. Atyia, S. S. Fouad, Shiv Kumar Pal, Ankita Srivastava, Neeraj Mehta
Summary: In this study, STSA samples with different compositions were synthesized and their thin films were prepared to investigate their optical properties. The results indicate that the composition of the films has a significant impact on the optical band gap values.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Arturs Bundulis, Ivan A. Shuklov, Vyacheslav V. Kim, Alaa A. Mardini, Jurgis Grube, Janis Alnis, Anna A. Lizunova, Vladimir F. Razumov, Rashid A. Ganeev
Summary: This study reports measurements of saturated intensities, saturable absorption, and nonlinear refraction in thin films containing HgTe quantum dots. Strong nonlinear refraction and saturable absorption were demonstrated in the films using tunable picosecond and femtosecond pulses, showing potential applications in various fields.
Article
Physics, Multidisciplinary
Chetan Sharma, Monika Barala, Getu Endale, Vinay Kumari, Devendra Mohan
Summary: The present work investigates the effect of thickness on the nonlinear optical properties of Erbium-doped zinc oxide (EZO) films. EZO thin films with varying thickness were prepared using a spin coating method. The films were analyzed using various techniques, and it was found that a thickness of 280 nm exhibited the best nonlinear behavior. This research provides insights for designing high-order optical limiter devices.
Article
Chemistry, Multidisciplinary
Steven Fiorino, Santasri Bose-Pillai, Kevin Keefer
Summary: The study shows that measuring atmospheric temperature gradients using different methods can result in significant differences in optical turbulence strength, especially in stable atmospheric layers and during diurnal quiescent periods. Parameters derived from sonic anemometers, such as velocity structure constant, can provide more accurate matching with optical turbulence strengths inferred by direct measurements.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Stephen J. Cox, Phillip L. Geissler
Summary: The surface of a polar liquid has different behaviors compared to the bulk liquid when it comes to solvation and organization of charged solutes. Researchers have attempted to understand the electrostatic response at aqueous interfaces by studying the spatial variation of dielectric permittivity, often concluding that the dielectric constant of interfacial water is significantly lower than in the bulk liquid. However, this analysis is complicated by the potentially nonlocal nature of dielectric response over interfacial heterogeneity. In this study, the authors used a thermodynamic approach and molecular simulations to calculate the solvent's contribution to the reversible work of charging a parallel plate capacitor in thin water films. The results showed good agreement with a simple dielectric continuum model, even for very thin films.
Article
Materials Science, Multidisciplinary
Sachin Kumar Yadav, H. E. Atyia, S. S. Fouad, Arvind Sharma, Neeraj Mehta
Summary: The research focuses on how doping different nano-materials (Graphene, Multiwalled Carbon Nanotubes, and Silver nanoparticles) affects the optoelectronic properties of selenium glass. Amorphous thin films of pure selenium and doped selenium with nano-additives were prepared and optically characterized. The optical characteristics were analyzed and values for optical band gap and Urbach tail were calculated. The doping of graphene, MWCNT, and Ag: NPs significantly increased the infinite dielectric constant of the parent selenium film. The nonlinear properties of the samples were discussed in terms of susceptibility and nonlinear refractive index.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Physics, Condensed Matter
Amirah Basir, Hanan Alzahrani, Khaulah Sulaiman, Fahmi F. Muhammadsharif, Alaa Y. Mahmoud, Rabab R. Bahabry, Mohammad S. Alsoufi, Tahani M. Bawazeer, Siti Fairus Ab Sani
Summary: The optical parameters of TPD:Alq3 composite thin films were investigated, showing improved refractive index, dielectric constant, and optical conductivity with Alq3 doping. The band gap results obtained from the Wemple and DiDomenico model were consistent with those from the Tauc equation, indicating that the films obey the single-oscillator model in defining optical transitions.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Meshal Alzaid, N. M. A. Hadia, E. R. Shaaban, M. El-Hagary, W. S. Mohamed
Summary: This paper investigates the structural, morphological, optical, and electrical conduction properties of 2D WSe2 thin films deposited by electron beam evaporation at room temperature. The study finds that the thickness of the films affects their nanostructure, optical constants, and energy bandgap. Additionally, the thin WSe2 films demonstrate wide absorption and a closely matched energy gap, making them promising candidates for photovoltaic applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Shiv Kumar Pal, Neeraj Mehta, H. E. Atyia, S. S. Fouad
Summary: The optical band-gap and related optical properties of Germanium containing quaternary alloys of SeTeSnGe (STSG) were studied, showing significant compositional dependence on various optical parameters, with the optical band gap decreasing by increasing Ge concentration in the parent STS glass.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Pei Bai, Mingchao Ma, Li Sui, Yunlong Guo
Summary: This study demonstrates significant changes in stiffness and the ratio between elastic and viscous responses in thin PDMS films under nanoconfinement, with an enhanced elastic modulus and increased viscous response observed. The results contribute to a better understanding of the nanoconfinement effect on viscoelastic properties of soft matter.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Environmental Sciences
Thomas D. W. Corbett, Adam Hartland, William Henderson, Gerald J. Rys, Louis A. Schipper
Summary: A novel Br--DGT technology was developed for accurate measurement of bromide concentrations in water, with high absorption and elution efficiencies, providing comparable results under different conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Nanoscience & Nanotechnology
Frank Angeles, Samreen Khan, Victor H. H. Ortiz, Mingfei Xu, Shisong Luo, Dinusha Herath Mudiyanselage, Houqiang Fu, Yuji Zhao, Richard B. B. Wilson
Summary: The thermal conductivity of wide bandgap semiconductor thin films has a significant impact on the performance of various devices. However, accurately measuring the thermal conductivity of sub-micrometer thin films with high values is difficult. This study proposes a combination of magneto-optic thermometry and TiN interfacial layers to enhance the spatiotemporal resolution of pump/probe thermal transport measurements.
Article
Optics
Kun Liu, Zhongguo Li, Xingzhi Wu, Yu Fang, Wenfa Zhou, Junyi Yang, Yingfei Sun, Ruipeng Niu, Zhangyang Shao, Lu Chen, Run Zhao, Yinglin Song
Summary: Al:CdO thin films with different aluminum doping concentrations were prepared via magnetron sputtering technique. The band gap and nonlinear absorption properties of the films can be effectively modulated by the Al concentration. The films also exhibit desirable carrier dynamics and optical limiting properties at high doping concentration.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Abhishek Kumar Pandey, Arun Kumar Tiwari, H. K. Paliwal
Summary: RF magnetron sputtering and GLAD deposition methods were used to compare the characteristics of titanium oxide thin films. The study found that GLAD deposition can change the thermal conductivity, specific heat, elastic properties, and optical characteristics of the films, leading to various applications in thermal solar collectors, sensors, and sensing-based industries.
