Search Results - "Bandgap"

We demonstrate an omnidirectional laser from a 3-D Bragg microcavity, which is fabricated from a cholesteric liquid crystal that is doped with reactive mesogen. The wavelength of the laser is found to be determined by the position of the photonic bandgap that was formed within the 3-D Bragg microcav...

Full description

This study employs density functional theory (DFT) to investigate the electronic and optical properties of molybdenum (Mo) and chalcogen (S, Se, Te) co-doped anatase TiO₂. Two co-doping configurations were examined: Model 1, where the dopants are adjacent, and Model 2, where t...

Full description

In this research, the impacts of hydrostatic pressure over the structural, elastic, electrical, and optical characteristics of RbYO2 (Rubidium Yttrium Oxide) were extensively investigated utilizing density functional theory (DFT). This study explored the theoretical framework, providing valuable ins...

Full description

The influence of ohmic (metallic) loss on the complex band structure (BS) and eigenmodes of 2-D plasmonic crystals is investigated. With the help of wave equations and periodic boundary conditions, a finite-difference-based eigenvalue algorithm is proposed to model the plasmonic crystals with arbitr...

Full description

We study theoretically the simultaneous existence of large phononic and photonic bandgaps in chiral phoxonic crystals by topology optimization. By analyzing the effect of the chiral symmetry with different material orientations in both the square and triangular lattices, we discuss the most suitable...

Full description

This work examines the structural and optical properties of temperature-controlled vanadium nitride (VN) thin films deposited using Metal Organic Chemical Vapor Deposition (MOCVD). VN precursors were synthesized from vanadium chloride and hexamethylenetetramine (HMTA) and deposited on soda-lime glas...

Full description

A conjugated alternating copolymer as the donor material of the active layer in polymer solar cells has been designed and synthesized via Stille coupling reaction. The alternating structure consisted of 3,5-didecanyldithieno[3,2-b:2',3'-d]thiophene (DDTT) donor unit and 5,6-bis(tetradecylo...

Full description

We theoretically propose an ultracompact large-dynamic-range dual-parameter sensor using a broad free spectral range (FSR) multimode photonic crystal nanobeam cavity (MM-PCNC). In the multimode regime, each resonant mode is exploited as an independent sensing channel. Broad FSR (>100 nm) is a...

Full description

Hollow-core anti-resonant fibers (HC-ANF) have the advantages of low scattering loss, wide bandwidth and simplicity of preparation, but are sensitive to bend, which limits their practical applications. On the contrary, hollow-core photonic bandgap (HC-PBGF) fibers have lower confinement loss and mor...

Full description

A ultra-wideband highly-birefringent Bragg layered photonic bandgap fiber (BL-PBGF) with concave-index cladding is proposed and demonstrated, by incorporating PBG effect with Bragg multilayers for the first time to the best of our knowledge. The proposed BL-PBGF contains honeycomb capillary cladding...

Full description

We develop a bistable smart window based on mixture of negative dielectric nematic liquid crystal, chiral dopant, and chiral ionic liquid (CIL). The developed smart window is driven by dual-frequency modulation, where the transparent state is turned <sc>on</sc> under an electric field wi...

Full description

Borophene, a two-dimensional (2D) monolayer of elemental boron, attracted considerable interest owing to its remarkable electronic, optical, chemical, mechanical, and catalytic properties. However, the complex structure and inherently low electrical conductivity of boron pose challenges to synthesiz...

Full description

The electrical conductivity of nanocrystalline CuMnO₂ samples, obtained by microwave-assisted hydrothermal synthesis (MWH), is studied by impedance spectroscopy over a frequency range of 30 Hz to 2 MHz and a temperature range from 30 to 120 °C. Three samples are prepared to st...

Full description

Abstract Direct‐bandgap germanium‐tin (GeSn) has attracted much interest for high‐performance optoelectronic and electronic device applications. However, the transition from indirect bandgap to direct bandgap in GeSn epitaxial films and the effects on the electron transport properties are not fully...

Full description

This article presents an investigation into the use of nanoscale phononic crystals (PnCs) as reflectors for surface acoustic wave (SAW) resonators, with a focus on pillar-based PnCs. Finite element analysis was employed to simulate the phononic dispersion characteristics and to study the effects of...

Full description

In this article, a two-dimensional photonic crystal-based XOR gate is designed and simulated. For this purpose, an initial two-dimensional photonic crystal structure is chosen and waveguides are created for inputs and outputs. Then, defect rods are selected so that the obtained outputs are approxima...

Full description

Five glass samples with a specific composition (in mol%) of 29CaO–70B2O3–(1-x)Al2O3–xTiO2 (where, x = 0, 0.25, 0.5, 0.75, and 1) were synthesized by melting (at tm≈1100 °C), quenching (at tq≈100 °C), and annealing (at ta≈300 °C) processes. The X- ray diffraction (XRD), Scanning electron microscopy (...

Full description

In this paper, the performance of indium-tin-oxide (ITO) free microcavity polymer solar cells based on the thieno[3,4-b]thiophene&#x002F;benzodithiophene:[6,6]-phenyl C₇₁-butyric acid methyl ester (PTB7:PC₇₁ BM) blend and transparent Ag electrode is...

Full description

The structural, morphological, and antibacterial effects resulted from incorporating zinc into magnesium oxide (MgO) host lattice. Two samples were synthesized via the precipitation method with 10 and 16% zinc concentrations, and their properties were compared with those of a commercial (MgOc) sampl...

Full description

Abstract The strain relaxation of Al‐rich α‐(AlxGa1‐x)2O3 single layers with x > 0.6 and an α‐Al2O3/Ga2O3 superlattice structure grown on m‐plane sapphire substrates by molecular beam epitaxy is investigated. Symmetrical full‐width half maximum values of X‐ray diffraction (XRD) omega scans are le...

Full description