Article
Chemistry, Physical
Yanfeng Wang, Fei Yang, Zhengjun Zhang, Yiping Zhao
Summary: Transparent metallic films (TMFs) are the best candidates among transparent conductive films (TCFs) due to their ability to maintain high electrical conductivity and optical transparency simultaneously under mechanical deformation. Empirical relationships and a figure-of-merit expression have been proposed to predict the overall quality and performance of TMFs, particularly in silver nanohole array TMFs. The experimental data and theoretical predictions show that a beta value of 5 is better for characterizing the performance of nanohole array TMFs compared to beta value of 10 for TCFs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Jimmy John, Amine Slassi, Jianing Sun, Yifei Sun, Romain Bachelet, Jose Penuelas, Guillaume Saint-Girons, Regis Orobtchouk, Shriram Ramanathan, Arrigo Calzolari, Sebastien Cueff
Summary: In this study, we demonstrate theoretically and experimentally a strong and tunable optical anisotropy in epitaxially-grown VO2 thin films. We reveal that these films exhibit an ultra-large birefringence through a combination of temperature-dependent X-ray diffraction, spectroscopic ellipsometry measurements, and first-principle calculations. Moreover, by leveraging the insulator-to-metal transition of VO2, we demonstrate a dynamic reconfiguration of optical properties from birefringent to hyperbolic, opening avenues for multi-functional devices with tunable anisotropy and hyperbolic dispersion.
Article
Nanoscience & Nanotechnology
Alvaro Rodriguez Echarri, Joel D. Cox, Fadil Iyikanat, F. Javier Garcia de Abajo
Summary: Nanoscale nonlinear optics can be enhanced by utilizing plasmonic excitations in nanostructures, but faces challenges such as inelastic losses due to fabrication imperfections.
Review
Materials Science, Multidisciplinary
Mujeeb Kareem, Taofeeqah Agbaje, Fahad Alam, Haider Butt
Summary: Smart contact lenses are developed to sense and treat diseases like intraocular pressure and glaucoma using tear fluid. This report reviews the processing of thin films to develop functional characteristics for their application in smart contact lenses. It discusses the types of thin films used, as well as various applications, from historical developments to the latest technologies related to thin films in smart contact lenses. Lastly, it presents challenges with contact lenses and improvements using thin films to overcome these challenges.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
A. F. Qasrawi, Shatha N. Abu Alrub, Rana B. Daragme
Summary: In this study, tungsten oxide thin films with excess oxygen were investigated as optical resonators for gigahertz/terahertz applications. The amorphous WO3 films prepared by thermal evaporation technique exhibited high transparency and showed potential applications in the infrared, visible, and ultraviolet ranges. The wide tunability of these films makes them promising for optical communications.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Analytical
Jeffrey Wuenschell, Ki-Joong Kim, Michael Buric
Summary: Optical fiber-based sensors are suitable for in-situ sensing applications in high temperature and harsh chemical conditions. This study combines single crystal sapphire fiber with a high-temperature stable perovskite oxide sensing layer to demonstrate all-optical oxygen sensing at extreme temperatures. The stability, humidity resistance, and low cross-sensitivity with CO2 make it viable for use in an operational SOFC or post-combustion environment.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Optics
Sumit Goswami, Ashwini Kumar Sharma
Summary: In this study, the overall film thickness dependency of metallic indium-rich indium tin oxide (ITO) thin films on lossy mode resonance (LMR) properties was explored using a Kretschmann-Raether geometry. The depth of LMR was found to increase monotonically with increasing film thickness, and the LMR positions were considerably redshifted. Numerical simulations based on a modified transfer matrix method were used to effectively simulate the LMR spectra of vacuum-deposited ITO thin films, taking into account surface roughness and anisotropic Bruggemann effective medium approximation. As an application, refractive index (RI) sensing was demonstrated, achieving high sensitivity values for transverse electric and transverse magnetic polarizations. This study provides a deeper understanding of the effect of film thickness on thin film-based LMR and highlights metallic indium-rich ITO as an excellent material for LMR studies.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Chemistry, Analytical
Arthur L. R. Souza, Marcio A. Correa, Felipe Bohn, Helder Castro, Margarida M. Fernandes, Filipe Vaz, Armando Ferreira
Summary: Titanium-copper alloy films with different copper concentrations were produced using magnetron sputtering and showed excellent thermoresistivity linearity and stability. The Ti0.70Cu0.30 sample exhibited the best characteristics as a temperature sensor. The Ti1-xCux films also demonstrated antibacterial properties.
Article
Materials Science, Multidisciplinary
Yevhen Zabila, Marta Marszalek, Michal Krupinski, Arkadiusz Zarzycki, Marcin Perzanowski
Summary: This study prepared semi-metallic bismuth thin films by thermal evaporation, observing stabilization of grain size at 140 nm and continuous decrease of resistivity with increasing thickness. Annealing the films at temperatures close to the melting point of Bi led to a significant increase in magnetoresistance at room temperature and in a 7T magnetic field.
Article
Optics
Wesley A. Britton, Yuyao Chen, Fabrizio Sgrignuoli, Luca Dal Negro
Summary: This paper introduces a novel design of dual-band multi-focal diffractive microlenses with a sub-wavelength thickness of only 235 nm, capable of simultaneously focusing visible and near-infrared spectral bands. Experimental results demonstrate that this microlens can achieve independent focal planes for two targeted spectral bands and encode the depth information of a sample into different spectral images.
LASER & PHOTONICS REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
Hemanth Maddali, Alexei M. Tyryshkin, Deirdre M. O'Carroll
Summary: This study demonstrates dual-mode polymer-based temperature sensors with a wide sensing range utilizing electrochemically doped RRa-P3HT films, allowing for optical and electrical sensing modes. The sensors exhibit a gradual thermal dedoping effect in the temperature range of 30 to 80 degrees Celsius, with a linear trend in the ratio of dedoped to doped peaks between 30 and 75 degrees Celsius, suitable for optical-mode thermal sensing.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Qin Chen, Xianghong Nan, Mingjie Chen, Dahui Pan, Xianguang Yang, Long Wen
Summary: Recent advances in low-dimensional materials and nanofabrication technologies have led to breakthroughs in nanophotonics field. Spectral routing and filtering schemes offer superior design freedom and efficient spectral utilization, critical for various applications.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
A. Borroto, S. Bruyere, S. Migot, C. de Melo, D. Horwat, J. F. Pierson
Summary: This study provides new insights into the formation of Zr-Cu nanostructured metallic glass thin films (NMGTF) deposited by magnetron sputtering. The film microstructure can be tuned from homogeneous and compact to nanostructured, formed by nanocolumns, by varying the working-gas pressure and the alloy composition. The microstructural change allows the electrical resistivity and the optical reflectance of the films to be tailored, and the results could have potential applications in the field of optoelectronics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Navid Daryakar, Christin David
Summary: The nonlinear optical response of metallic amorphous composite layers was studied, and it was found that the fill fraction strongly influences the effective nonlinear susceptibility of the materials. Both saturated and induced absorption were observed depending on the selected frequency and relative position to the resonant frequency.
Article
Chemistry, Physical
Danagul Shauyenova, Sol Jung, Haneul Yang, Haein Yim, Heongkyu Ju
Summary: Co-based thin-film metallic glass (TFMG) was studied for its structural, electrical, and optical properties. The TFMGs exhibit characteristics of a dielectric material, with higher resistivity and lower carrier concentration compared to pure cobalt thin films of the same thickness. Optical investigation revealed positive real part of complex relative dielectric constant and significant light absorption properties in TFMGs. Moreover, Co-based TFMG showed optical transparency at thicknesses below 5 nm and demonstrated thickness-independent electrical and optical parameters, making them potentially useful for micrometer-scale optoelectronic and magneto-optical devices.
