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 out

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

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 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

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

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

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)

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 dilectric 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 graphene

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

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

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

Recently we have analyzed light transmission and spectral selectivity by optical channels in Müller cells and other transparent cells, proposing a model of their structure, formed by specialized intermediate filaments [1,2]. Our model represents each optical channel by an axially symmetric tube with conductive walls. Presently, we analyze the planar polarization selectivity in long nanostructures,