The two-dimensional (2D) heterostructure of black phosphorus (BP)–MXene shows great stability in liquid and gaseous environments. Sensitivity enhancement of a surface plasmon resonance (SPR) sensor utilizing BP and Ti3C2Tx MXene layer is proposed in this work. A CaF2 glass prism is considered as the coupling substrate and 2D Ti3C2Tx MXene as analyte interacting layer. The sensor’s performance is demonstrated

A plasmonic refractive index sensor based on a metal-insulator-metal waveguide coupled with a double concentric square ring resonator is proposed and analyzed both theoretically and numerically. The theoretical and the numerical results are based on the transmission-line model and the finite difference time domain method, respectively. The theoretical results agree well with the numerical ones. A maximum

Nonlinear metasurfaces that dynamically manipulate the phase of a passing light beam are of interest for a wide range of applications. The controlled operation of such devices requires accurate measurements of the optical transmission phase in both the linear and nonlinear regime, an experimentally challenging task. In this paper we show that this phase information can be extracted directly from simple

This paper proposed a novel structure to improve modulation bandwidth of light-emitting diode. The SiO2-ITO quasi-symmetrical waveguide structure and SiO2-Ag grating are used to enhance the internal quantum efficiency. The surface plasmons induced by Ag can effectively increase the spontaneous emission rate and carrier recombination lifetime. Diamond is used to improve the heat dissipation performance

In a context of climate change, understanding the influence of temperature on fish species growth is important for the management of fisheries. The effect of increasing temperature on the growth of juvenile Greenland halibut (Reinhardtius hippoglossoides), a cold-water species, circum-continental in the Arctic, was investigated on juveniles that had been captured in the wild and kept in captivity.

In this paper we aim to propose and design an all optical analog to digital converter for generating 2-bit Gray codes from the optical intensity of the input signal. Two nonlinear resonant rings will be used for realizing the proposed structure. These nonlinear resonators should be designed such that they can drop optical waves at different optical intensity ranges. The nonlinear resonators will be

We perform a theoretical study of light propagation properties in two-dimensional square photonic crystals following Bravais-Moiré patterns, paying particular attention to the influence of the transversal shape and the orientation of the dielectric scatters onto the width and position of photonic band gaps. In this sense, we have considered both square and triangular transversal geometries for the

An ultra-compact all-optical half-adder operating at 1550 nm on silicon-on-insulator is realized by a modular-inverse-design method which deconstruct the design of optical units with complicated functions to several devices with basic functions. The half adder is composed of five modules: two beam splitters, one hub, one XOR gate and one AND gate, all of which are designed by the same multi-objective

In this work, we introduce a four green-light wavelength splitter device, based on six slot-waveguide structures. Silica and gallium nitride materials were chosen for confining the green light inside the slot-waveguide area in a transverse magnetic field mode. The device functioned as a 1 × 4 demultiplexer, which demultiplexes wavelengths in the green-light band with wavelength range of 500–530 nm

We propose a novel analytical model for anisotropic multi-layer cylindrical structures containing graphene layers. The general structure is formed by the aperiodic repetition of a three-layer sub-structure, where a graphene layer with isotropic surface conductivity of σ is sandwiched between two adjacent magnetic materials. Each anisotropic material has permittivity and permeability tensors of ε̿ and

Plasmonic chemical and biological sensors have many advantages such as compact sizes and extremely high sensitivity. Biosensors based on plasmonic waveguides and resonators are one of the most attractive candidates for mobile and portable devices. In this work, we proposed a metal-insulator-metal waveguide semi-ring resonator loaded with nanodots periodically decorated in the cavity. The spectral characteristics

In this paper, a new technique is proposed for designing stealthy radome, especially for normal incoming wave stealth. The proposed structure is composed of a band-pass FSS and one layer of polarization conversion arrays which are separated by a foam layer. An FSS-backed polarization conversion meta-surface (PCM) can be obtained. The FSS-backed PCM is capable of providing a second-order transmission

A new photonic crystal (PC) based 2×1 multiplexer, which composed of a Kerr nonlinear Fano resonance-based switching module and an adder module, is presented. In the proposed device, using a pump light power, it is possible to control the transmissions of the input signals into the output port. The performance of the proposed device is examined using the finite-difference time-domain (FDTD) method

Plasmonics have allowed revolutionary progress in field of random lasers through improvement of the lasing property via surface plasmon resonance (SPR). However, localized surface plasmon resonance (LSPR) spectra of conventional metal nanostructures are too narrow to sufficiently cover both the absorption and emission spectra of dyes. Therefore, in this paper, we fabricate a typical Ag-TiO2 composite

The metasurface-based concept of a smart table for wireless power transfer (WPT) has been recently proposed and experimentally proven to be capable of transferring energy to 1 m with high efficiency. However, in reality, we usually encounter the need to transfer energy to several receivers and with the presence of various obstacles. Herein, we explore the capabilities of the smart table scenario in

In the present work, some optical properties related to intersubband transitions in finite depth asymmetric hyperbolic-type quantum wells are theoretically investigated. The use of a hyperbolic potential configuration would account for the actual – non abrupt – confinement potential in the heterostructure, in the case of modulated growing or when compositional diffusion across the interfaces turns

An ultrabroadband and compact square-lattice photonic crystal fiber polarization filter based on surface plasmon resonance is proposed. Four large air holes are introduced near the core to destroy the symmetry of the original fiber structure so that the resonance wavelengths of x- and y-polarized core modes can be well separated. The inner walls of two large air holes along the x polarization direction

A mirrored bilayer structure incorporating layers of Graphene and MoS2 is proposed here for Surface Plasmon Resonance (SPR) biosensing and its performance is evaluated numerically. Starting from the basic configuration, the structure with graphene and MoS2 layers is gradually developed for enhanced performance. Reflectance is the main considered parameter for performance analysis. A theoretical framework

Metal-organic frameworks (MOFs) represent a unique platform for fabrication of nanoparticles (NPs) of diverse composition and crystallinity. The growth of NPs from constituent parts of MOFs is usually initiated by external stimuli such as temperature, light and electron irradiation. Herein, the kinetics and NP growth mechanisms remain unexplored. Here, we utilized electron irradiation to initiate the

A six-port path-reconfigurable circulator based on Y-type plasma photonic crystals (PPC) has been proposed. By calculating and analyzing the transfer matrix equation of the transverse magnetic (TM) waves, it can be concluded that the anisotropy generated by the magnetized plasma enables the TM waves to produce elliptical polarization. Therefore, the plasma columns are introduced in the design of a

The design flexibility of Hollow-Core Photonic Crystal Fibres (HC-PCFs) is a significant feature that allows the fibres to achieve excellent optical properties. Changes in the design parameters of HC-PCFs used for gas sensing can affect their optical and gas flow properties. The aim of this paper is to investigate the performance of three HC-PCFs with different geometries (HC-800-02, HC-1550-02, HC-2000-01)

In this paper, we theoretically demonstrate a nanophotonic optical asymmetric transmission device (NOATD) for arbitrary linear polarization, which is composed of two two-dimensional (2D) square-lattice photonic crystals (PhCs) with different effective refractive indices. In this way, the NOATD achieves asymmetric transmission based on the generalized total reflection principle, which is able to realize

Optical analog to digital conversion is very important for implementing all-optical data processing systems. In this study, we designed an all-optical analog to digital converter using photonic crystal nonlinear ring resonators. The main goal of this study was to design an optical analog to digital converter with no upper limit for the input optical intensity when generating “11” codes at the output

Light angular momentum is used to characterize the dynamical rotation of electromagnetic wave, as spin angular momentum describes its polarization rotation while orbital angular momentum describes its phase rotation. Though various methods have been proposed to detect light spin or orbital angular momentum independently, it is still a challenge to determine both of them simultaneously. Here, based

Magnetic resonance (MR) images spatial resolution, which is a key factor in early diagnosis of many diseases, is fundamentally limited by the signal-to-noise ratio, which in turn depends upon the efficiency of the receive radiofrequency coils design. Many various multi-channel coils were designed to improve the quality of MR images. Another way to enhance the quality of magnetic resonance imaging (MRI)

This paper introduces a novel lateral quantum well solar cell, and investigates the effects of structural parameters of these nanostructures on the device’s performance. For modeling the device, first, the absorption coefficients and the reflectance parameters of the device at different regions were calculated. Those parameters were then used to find the system’s optical generation rate. Finally, while

A novel compact photonic crystal ring resonator is designed based on phase-change material (PCM) to realize reconfigurable directional-coupler switching for the two wavelengths of coarse wavelength division multiplexing (CWDM) system at 1530 nm and 1550 nm. The working mechanism of this PCM-based device is analyzed from the perspective of the coupled optical field in the inner and outer resonator rings

We propose a new graphene-based THz circulator. It consists of a circular graphene resonator and three graphene nanoribbon waveguides of W-geometry placed on a dielectric substrate. Surface plasmon-polariton waves propagate in the waveguides. The nanoribbon excites in the resonator dipole resonance. Nonreciprocity of the device is defined by nonsymmetry of the conductivity tensor of the magnetized

A novel hybrid all-optical infrared switch based on metal-insulator-metal plasmonic and one dimensional photonic crystal structures is introduced in this paper. A photonic crystal lattice composed of two different (low and high refractive index) Kerr materials is located at the center of the switch. Two plasmonic metal-insulator-metal waveguides are used to transfer the data signal. Also, two dielectric

In this paper, the behavior of radiation including the reconfiguration capability of planar metallic antenna structure using graphene in the microwave (MW) and terahertz (THz) frequency range is investigated. Different from the conventional reconfigurable metal planar antenna and graphene plasmonic THz antenna designs, this planar microstrip metal antenna structure is realized by placing a graphene

In this study, a pyramid Ag–Fe embedded graphene oxide nanocomposite (PAFG) was synthesized and characterized using field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), and ultraviolet–visible (UV-V–visible (UV–vis) spectroscopy. FESEM images indicated the successful synthesis of exfoliated graphene sheets with a thickness of 7 nm, 30 nm Fe nanoparticles

Photonic quasicrystals are of particular interest for waveguiding applications because of their beneficial advantages over conventional photonic crystals, such as higher-order rotational symmetry and more isotropic Brillouin zone. In this work, by use of a 12-fold symmetric photonic quasicrystal lattice and an optofluidic infiltration approach, we sought to design a hollow-core fiber for telecom C

We performed numerical simulations of plasmonic near-field enhancement in Si-based structures in near infrared region. Gold films perforated with periodic two-dimensional subwavelength hole arrays were used as the plasmonic couplers. The array periodicity was adjusted to excite the surface plasmon modes at the telecom wavelengths (between 1.3 and 1.55 μm). The field intensity enhancement factor and

We theoretically report that asymmetric transmission phenomenon of linearly polarized light enables an ultrasensitive and background-free metamaterial sensor with a sensitivity of 47.5 THz/RIU in the optical range. The asymmetric transmission in the metamaterial arises from the twist arrangement of two cascaded ring apertures and its asymmetric factor can reach 0.47. Importantly, by detecting the direction-dependent

A Si-based vertical nanowire heterostructure array photodetector is designed and studied by a coupled three-dimensional optoelectronic simulation. Each nanowire is composed of an InP/In0.53Ga0.47As/InP axial p-i-n junction, which is designed to operate at telecommunication wavelengths. The results show that the absorption of the nanowire array strongly depends on the D/P ratio and nanowire diameter

The process of aggregation of two colloidal quantum dots in the field of quasiresonant laser radiation is investigated via computer simulation. The cases of either completely deterministic movement of particles or the movement with the account for random forces are considered. The conditions of pair formation are determined in dependence on initial interparticle distance, on laser wavelength, and on

A novel method of magnetic field assisted nondestructive optical probing of photonic lattice structures in photorefractive crystals is demonstrated experimentally. High contrast annular symmetry micrometric scale refractive lattice structures were recorded by nondiffracting Bessel beam technique with the use of 532 nm, 17 mW power laser beam in Fe doped lithium niobate crystal. The stability of recorded

Cauliflower shape nanostructured Cs-doped CdO (CdO:Cs) thin films were grown using perfume atomizer. A strong (1 1 1) preferential orientation is noticed for the cubic structured CdO:Cs thin films. Surface morphology of CdO was strongly influenced with Cs doping. All the doped films exhibit better transparency than pure CdO. With Cs doping, the absorption edge seems to shift towards lower wave lengths

Based on a two-level system, the linear and third-order nonlinear optical properties are analyzed for CdSe/ZnTe spherical core/shell quantum dots embedded in various dielectric matrices including poly-vinyl alcohol, polyethylene and silicon nitride. Our results reveal that by increasing core/shell radii ratio the eigenenergies as well as the transition energy decreased. The presence of the dielectric

Planar structures with two metal nanolayers supporting long-range surface plasmons (LRSPs) are described. We introduce a design where a one-dimensional photonic crystal (1D PC) is used as a support for a planar dielectric film sandwiched between two metal nanolayers. This quasisymmetric design is compared with a symmetric where two metal nanolayers deposited on opposite sides of the planar dielectric

Inverse-design algorithms can be used to design compact and high-performance complex photonic structures. In this study, we propose the design of an all-dielectric optical resonator based on the concept of the parallel mirror resonator by using the objective-first inverse design algorithm. Light is strongly confined using a predefined objective function that creates symmetric mirror regions acting

A novel composite structured all-fiber sensor was designed and experimentally demonstrated for simultaneous measurement of displacement and temperature. The sensor consists of a knotted shape core cladding optical fiber. The interferometer notch of a knotted shape fiber was found to be highly sensitive to the micro-displacement as well as environmental temperature, while the core-offset fiber was sensitive

This paper presents a numerical study of a nanoscale hydrogen gas sensor based on a surface plasmon polariton resonator system. The system consists of two resonators, one with a silver-core and the other with a palladium-core, and a side-coupled access waveguide. In this study, an effective method for eliminating inhibitory detection parameters in hydrogen gas detection is proposed. With a sensitivity

The mode properties of solid-core photonic crystal fibers (PCFs) having square, pentagonal, hexagonal, octagonal, nonagonal, decagonal, and dodecagonal lattice formats with uniform air-filling fractions (AFFs) have been evaluated by a full-vector finite-element method using the software COMSOL Multiphysics 4.3. Irrespective of the hole-to-hole spacing for a particular type of lattice, the ratio of

Plasmon-exciton coupling in hetero-bilayer of WSe2 and WS2 transferred onto Au nanorod arrays is studied. Dark-field scattering measurements reveal that the in-plain dipole moment of excitons in monolayer WS2 allows only the narrow spectral range of 30 nm for the resonant coupling between the localized particle plasmons from Au nanorods and the bright excitons from WS2. We demonstrate that the q-parameter

Today, photonic integrated circuits (PIC) that work with a high-modulation speed (100Gb/s and beyond) are required to use more optical power to overcome the losses. One solution is to use a high-level laser with a hundred milliwatts power. However, for a microchip circuit, this solution can be problematic due to the nonlinear effects and high cost. Therefore, to solve this issue, we propose a new design

Visible light active photocatalytic processes have gained much interest in removing the organic pollutants from wastewater. In this article, we report the ZnO prepared by a simple co-precipitation method and characterized by PXRD, FE-SEM, TEM, DRS, and FTIR. The photocatalytic activity of ZnO assisted by H2O2 was examined for the degradation of the aqueous solution of Crystal violet (CV) under visible

In this contribution we present numerical and experimental results of a parametric quantitative study of radiative dipole antennas in a phased array configuration for efficient body magnetic resonance imaging at 7 T via parallel transmission. For magnetic resonance imaging (MRI) at ultrahigh fields (7 T and higher) dipole antennas are commonly used in phased arrays, particularly for body imaging targets

Optical addition and subtraction are very crucial functions required in all optical computations and processing. In this article we propose an all-optical circuit that can implement these functions simultaneously. The proposed device can be realized by combining optical XOR gates with a 2-bit full adder. Four nonlinear ring resonators are used to realize the proposed structure.

In this study, we developed a simple hybrid structure and an appropriate numerical analysis method for a prism-based surface plasmon refractive index biosensor by using an angular interrogation method. The proposed sensor comprised a prism filled with a hybrid of gold (Au), alpha tin selenide (α-SnSe), and graphene, and a sensing medium. Monolayers of α-SnSe with a similar structure to graphene and

We design a novel eight-channel demultiplexer in a solid-fluid phononic crystal structure. The basic structure has been formed by square arrangement of holes filled by water in tungsten background. These holes are embedded in background with filling fraction of 46 %. Generally, the proposed structure consists of nine type line defects for input and output channels. These line defects consist of two

In this study, we investigated a compact refractive index (RI) sensor containing two concentric double-square resonators with plasmonic metal/insulator/metal (MIM) structures to facilitate the sensing of human blood groups. The sensing surveys were conducted using the finite difference time domain method. Intensive coupling occurred due to momentum matching between the equivalent modes of the square

Spontaneous emission dynamics of rhodamine 6G molecules coupled into transverse Anderson localized modes in a hyperbolic waveguide is investigated using time-resolved experiments. Four hyperbolic waveguides are simultaneously formed inside a deltoid-shaped fused-silica microtube via the capillary effect. The disordered photonic environment consisting of a rhodamine-doped polymeric material with randomly

In this paper an approach for broadening of operational band in a dense array of dipole antennas by implementing passive split-loop resonators (SLRs) as decouplers is presented. Compared to the previous method, where three closely located active dipoles were decoupled by two passive dipole, the operational band is significantly improved from 0.5% to 1.6% at the same level of decoupling −8 dB for the

Silicon-on-insulator (SOI) waveguides with different geometries have been employed to design various integrated optical components. Reducing the bending radius of the SOI waveguides with low bending loss is essential in minimizing the footprint of light-wave circuits. The propagating mode is less confined in the core of the ultra-thin SOI waveguide and penetrates to substrate and cladding, leading

A novel surface-plasmon-enhanced structure is proposed to improve the absorption efficiency of organic solar cells in this paper. The PEDOT:PSS-Ag light-trapping structure introduced allows light to be reflected multiple times between the multilayer films, increasing the optical path length of light in the device and the light absorption by the absorption layer. The Ag film in P3HT:PCBM absorption