Science topic

Waveguides - Science topic

Explore the latest publications in Waveguides, and find Waveguides experts.
Filters
All publications are displayed by default. Use this filter to view only publications with full-texts.
Publications related to Waveguides (10,000)
Sorted by most recent
Article
Full-text available
Microscopic electric fields govern the majority of elementary excitations in condensed matter and drive electronics at frequencies approaching the Terahertz (THz) regime. However, only few imaging schemes are able to resolve sub-wavelength fields in the THz range, such as scanning-probe techniques, electro-optic sampling, and ultrafast electron mic...
Article
Full-text available
A highly stretchable and transparent electrode is a key element for realizing stretchable organic light-emitting diodes (SOLEDs). To date, several reports have been made on this issue; however, a sufficiently high mechanical stability (i.e., 100% stretchability) has not yet been demonstrated. Herein, we propose a titanium particle-embedded indium z...
Article
Full-text available
Plasma accelerators driven by high-power lasers can provide high-energy electron beams on a dramatically smaller scale than conventional radio-frequency accelerators. However, the performance of these accelerators is fundamentally limited by the diffraction of the laser. Laser-generated plasma waveguides can mitigate this problem and, combined with...
Article
Full-text available
On-chip spatial mode operation, represented as mode-division multiplexing (MDM), can support high-capacity data communications and promise superior performance in various systems and numerous applications from optical sensing to nonlinear and quantum optics. However, the scalability of state-of-the-art mode manipulation techniques is significantly...
Article
Full-text available
Silicon photonic platforms offer relevance to large markets in many applications, such as optical phased arrays, photonic neural networks, programmable photonic integrated circuits, and quantum computation devices. As one of the basic tuning devices, the thermo-optic phase shifter (TOPS) plays an important role in all these applications. A TOPS wit...
Article
Full-text available
A novel composite total internal reflectance fiber structure on monocrystalline silicon (mono c-Si) constructed by specific micro-structures with base angle of 55 degrees and closely nested PMMA film is innovatively proposed to achieve a more effective sunlight trap for the first time. Besides the trapped light caused by multiple reflections on the...
Article
Full-text available
In this letter, a highly accurate surrogate model of substrate integrated waveguide (SIW) is proposed. This model allows designers to design SIW structures more efficiently compared to existing complex and CPU‐intensive fine approaches. Based on the multivariate linear regression technique, an accurate equation linking the physical parameters of th...
Article
Full-text available
This study presents an electrically small antenna loaded with a parasitic loop resonator for dual‐band operations. The proposed configuration covers 2.4 GHz Bluetooth/Wi‐Fi, 5G new radio (n79), and 5 GHz WLAN bands. In this study, a coplanar waveguide (CPW) feed L‐shaped driven element is capacitively coupled with a parasitic loop resonator to get...
Article
Full-text available
In this study, a Ka‐band dual‐mode dielectric resonator filter is studied. As a new approach, to mount the dielectric resonator on the input coupling slot, a mechanical protrusion is designed. By use of this structure, controlled source coupling and excitation via waveguide can be allowed. Compared with coaxial cable excitation, waveguide excitatio...
Article
Full-text available
In this article, a novel isosceles right triangle resonators filter is presented based on cross‐coupling technology. The whole filter is a square structure and it consists of four isosceles right triangle resonators. By introducing negative cross‐coupling between two resonators, a fourth‐order cross‐coupling dielectric waveguide filter with two out...
Article
Full-text available
This letter presents a compact tri‐band filter using a dual‐capacitively loaded (DCL) substrate integrated waveguide (SIW) triple‐mode resonator. The frequencies of TE101, TE102, and TE103 are shifted lower by the capacitive loading effect, which is achieved by the DCL structure. A compact tri‐band example filter is then built by using two DCL trip...
Article
Full-text available
The Method of Lines is a semi-analytical versatile tool for the solution of partial differential equations. For the analysis of spatial complex linear waveguide structures, this method is combined with impedance/admittance and field transformation, as well as with finite differences. This paper extends this approach to the treatment of structures w...
Article
Full-text available
Slot antenna based on microstrip line and waveguide is a popular design for future 5G antennas. To improve performance of slot antenna, a high‐gain wideband slot antenna based on integrated substrate gap waveguide (ISGW) is presented, in which a stepped impedance feeding line is adopted to broaden bandwidth, and ISGW is used to increase gain. First...
Article
Full-text available
A flat-topped wavelength filter with low crosstalk and high productivity is proposed and theoretically analyzed. The proposed filter scheme is composed of multiple cascade-connected delayed interferometers with several multimode interference couplers with 50:50 and 28:72 split ratios and a directional coupler with a 92:8 split ratio. Theoretical re...
Article
Full-text available
A low‐profile self‐hexplexing antenna based on the multimode substrate integrated waveguide (SIW) cavity is presented for mobile terminal applications. It has three feeding ports, each of which can generate two resonant modes. Taking the advantage of the truncated SIW resonant cavity, the footprint of the antenna remains compact in the multiple fun...
Article
Full-text available
Here, we report on a robust and efficient mechanism for tuning the microwave coupling of a Q-band (34 GHz), general purpose, cylindrical EPR cavity operating in the TE011 mode. This novel mechanism allows for both the adjustment of the cavity’s coupling over a wide frequency range, as well as its bandwidth from that of a high-Q cavity (about 10 MHz...
Article
Full-text available
This paper presents the design and construction of a new planar optical Polymer Waveguide Bragg grating (PWBG) temperature and humidity sensor realized by polymer-glass hybrid technology composition with a new layout concept. The Bragg grating of a sensor was made by a Direct Laser Writing (DLW) in Poly (methyl methacrylate) (PMMA) formed on a mult...
Article
Full-text available
This article proposes an active frequency selective surface (FSS) with application to satellite multi‐band antennas in X and Ka bands. The FSS offers two reflective bands at 20 and 30 GHz (downlink and uplink frequencies of broadband communication satellites in Ka‐band) under one biasing state, whereas the frequency characteristics are switched in...
Article
Full-text available
In this letter a novel notched multi‐input‐multi‐output (MIMO) flexible slot antenna with a C‐slot is proposed and designed for wireless body area network (WBAN) and Internet of Things (IoT) applications. The proposed antenna is comprised of four similar elements with the feed line of coplanar waveguide (CPW). Antenna is printed on flexible liquid...
Article
Full-text available
A nanoscale 3D hybrid plasmonic waveguide (HPWG) refractive index-cum- temperature sensor has been proposed and simulated in this work. The aqueous analyte (benzene C6H6) sensing is possible over the wavelength range from 1.18 μm to 2.2 μm. A well-known refractive index (RI) sensing method (or wavelength interrogation) is considered for the propose...
Article
Full-text available
In this article, a novel miniaturized antipodal Vivaldi antenna (AVA) is proposed with significant improvement in the back and sidelobe levels (SLLs) to mitigate their adverse effect on the communication system components. The proposed AVA enhances SLL up to −5.7 dB and front to back ratio (FBR) to 20.2 dB. These improvements are accomplished by an...
Article
Full-text available
This paper presents a wideband circularly polarized (CP) multibeam antenna array, which is with full azimuth scanning capability and operates in Ka band for 5G applications. It adopts a circular array configuration and consists of 18 elements with a simple structure. Regarding to each element, it is fed by a 90° bent rectangular waveguide and emplo...
Article
Full-text available
A compact low‐profile wideband open‐ended rectangular waveguide (RWG) antenna is proposed in the Ka‐band with corrected radiation patterns. The antenna is developed on a piece of metal with the same size as the standard flange of WR‐28 waveguide to facilitate the integration. To improve the impedance matching, waveguide steps are introduced at the...
Article
Full-text available
Seven all-optical logic gates based on hybrid plasmonic squared-shaped nanoring resonators and strips are proposed, designed, and numerically analyzed using finite element method with COMSOL software package version 5.5. Constructive and destructive interferences between the input port(s) and the control port(s) are the main operating principles us...
Article
Full-text available
A miniaturized multiband broadband quasi‐self‐complementary antenna (QSCA) is presented, which mainly consists of a third‐step radiation patch on the right and a third‐step wide slot on the left. With the help of an L‐shaped metal ground patch, a coplanar waveguide (CPW)‐like matching technique is used to improve the impedance matching of the anten...
Article
Full-text available
The Method of Lines in combination with impedance/admittance and field transformation is used to analyze electromagnetic waves. The used cases are waveguiding structures in microwave technology and optics. The core of the theory is the solution of generalized transmission line equations (GTL). In the case of complex structures, a combination with f...
Article
Full-text available
A hybrid plasmonic waveguide structure composed of graphene-coated nanotube with a dielectric substrate is proposed in this paper. Transmission properties of the fundamental mode are studied by the finite element method (FEM). The results reveal that the mode transmission properties are greatly dependent on the nanotube radius and internal–external...
Article
Full-text available
This article presents a novel CPW fed ultrawideband (UWB) antenna for detection of unwanted tumor cells in the human breast. Here, a compact and miniaturized UWB antenna employed with dodecagonal edges is proposed for broadening the bandwidth from 2.26 to 13.71 GHz (measured fractional bandwidth of about 143.39%). The antenna is designed on a durab...
Article
Full-text available
The design and study of structures exhibiting bound states in the continuum (BICs) are the object of continuous works in wave physics. These long-lived states which are localized in some parts of the system without interacting with the background have found several potential applications due to their high sensitivities to weak perturbations, in par...
Article
Full-text available
In this paper, we propose three kinds of substrate-integrated waveguide (SIWs) based chamfered bend power divider junctions provide equal power distribution to all output ports while maintaining high isolation and operating in the 54 GHz to 60 GHz frequency band. The advantages of the SIW technology are ease of design, fabrication and low form and...
Article
Full-text available
Lead-halide perovskites offer excellent properties for lighting and display applications. Nanopatterning perovskite films could enable perovskite-based devices with designer properties, increasing their performance and adding novel functionalities. We demonstrate the potential of nanopatterning for achieving light emission of a perovskite film into...
Preprint
Full-text available
Examining the physical properties of materials - particularly of toxic liquids - under a wide range of thermodynamic states is a challenging problem due to the extreme conditions the material has to be exposed to. Such temperature and pressure regimes, which result in a change of refractive index and sound velocity can be accessed by optoacoustic i...
Article
Full-text available
We investigate the single-photon transport properties in a hybrid waveguide quantum electrodynamics system, in which a one-dimensional waveguide is simultaneously coupled to a cavity and a driven Λ-type three-level atom. The cavity and the atom are also coupled to each other. We show that when the waveguide is coupled to the cavity and the atom at...
Article
Full-text available
Controlling vibrations in solids is crucial to tailor their elastic properties and interaction with light. Thermal vibrations represent a source of noise and dephasing for many physical processes at the quantum level. One strategy to avoid these vibrations is to structure a solid such that it possesses a phononic stop band, that is, a frequency ran...
Preprint
Full-text available
The distant projection of high peak and average power laser beams in the atmosphere is a longstanding goal with a wide range of applications. Our early proof-of-principle experiments [Phys. Rev. X 4, 011027 (2014)] presented one solution to this problem, employing the energy deposition of femtosecond filaments in air to sculpt millisecond lifetime...
Preprint
Full-text available
Giant atoms -- quantum emitters that couple to light at multiple discrete points -- are emerging as a new paradigm in quantum optics thanks to their many promising properties, such as decoherence-free interaction. While most previous work has considered giant atoms coupled to open continuous waveguides or a single giant atom coupled to a structured...
Article
Full-text available
Waveguide devices of polarization processing are key elements of modern dual-polarized antenna systems. Such antenna systems carry out polarization transformation and separation of signals with orthogonal polarizations in satellite communications and radar appliances. Well-known electrodynamic methods are used to simulate performance of such device...
Article
Full-text available
A miniaturized dual‐band reflective metasurface unit cell is presented based on a square fractal copper‐ring patch combined with a PIN diode. Its structure is optimally designed via the genetic algorithm to achieve 18 0 ∘ $18{0}^{\circ }$ phase differences of the reflection coefficients between on and off states of the PIN diode at both C‐ and X‐ba...
Article
Full-text available
The polarization beam splitter is an essential photonic integrated circuit in applications where a high-performing on-chip polarization diversity scheme is required. The lower refractive index contrast of the silicon nitride material platform compared to silicon-on-insulator constitutes the separation of polarized light states a challenging task si...
Article
Full-text available
We report the designs of on-chip grating couplers for the silicon hybrid plasmonic waveguides, which is the first proposal, to the best of our knowledge, for the direct coupling between a standard single-mode fiber and a hybrid plasmonic waveguide. By leveraging the apodized gratings and a two-stage-taper mode converter, we obtain a theoretical cou...
Article
Full-text available
A rigorous approach was employed for the accurate evaluation of the electromagnetic interaction between a thin metallic rod and a two-dimensional (2D) slotted cavity. The problem was posed as a classical boundary value problem for the Helmholtz equation in which a 2D slotted open cavity is bounded by an arbitrary but otherwise smooth contour with a...
Experiment Findings
Full-text available
TE 1,0 is considered to analyze the working of a waveguide( E plane), and the performance of the Waveguide is listed and presented.
Article
Full-text available
Sources of spectrally engineered photonic states are a key resource in several quantum technologies. Of particular importance are the so-called factorizable biphoton states, which possess no spectral entanglement and hence, are ideal for heralded generation of high-purity single photons. An essential prerequisite for generating these states through...
Article
Full-text available
Negative absolute temperature has wide range of applications, such as high-efficiency quantum heat engines, quantum refrigerators, and quantum simulation. In a recent paper [Phys. Rev. Lett. 120, 060403 (2018)], the authors proposed two spin ensembles coupled to the same reservoir collectively, one ensemble relaxes to negative temperature since two...
Preprint
Full-text available
We propose and experimentally demonstrate a family of Floquet solitons in the bulk of a photonic topological insulator that have double the period of the drive. Our experimental system consists of a periodically-modulated honeycomb lattice of optical waveguides fabricated by femtosecond laser writing. We employ a Kerr nonlinearity in which self-foc...
Article
Full-text available
Near-field photonics has attracted extensive attention for its applications from classical to quantum fields, and near-field directionality is the core of many applications. Here, we use a sandwich structure to investigate the effects of waveguide width and source position on the behavior of spin, Huygens and Janus sources. Although the structure i...
Article
Full-text available
Photonic jets (PJs) are important mesoscale optical phenomena arising from electromagnetic waves interacting with dielectric particles with sizes around several to several tens wavelengths (~2–40 􀀁). It generates a narrow, high-intensity beam at the shadowside of the ‘particle lenses’ made from microspheres, cylinders (fibers), cubes, disks and oth...
Article
Full-text available
Silica-based optical fibers are the most important transmission medium for long-distance and large-capacity optical communication systems. The most distinguished feature of optical fiber is its low loss characteristics. A single-mode optical fiber (SMF) exhibits a very low transmission loss (0.142 dB/km) at 1.55 µm. Together with such low loss char...
Article
Full-text available
The work reports on the fabrication and characterization of a photochromic glass and its planar waveguide structure. At the first step, the photochromic glass with a composition of 60 SiO2–14 Na2O–6 Al2O3–20 B2O3–0.15 AgNO3 (mol%) was synthesized by the melt-quenching technique and its absorption spectrum was measured by the JASCO V-570 UV/VIS/NIR...
Article
Full-text available
Topological acoustic insulators enable sound waves to transmit along the surface without backscattering, which builds a new pathway towards sound wave control. However, a large share of topological acoustic insulators are realized based on special point group symmetry and Bragg scattering mechanism. This method not only exerts a restriction on the...
Article
Full-text available
Doped cadmium oxide (CdO) films support tunable, low‐loss surface plasmon polaritons (SPPs) and epsilon‐near‐zero (ENZ) modes throughout the mid‐infrared. Prior work demonstrated that polaritonic strong coupling could be realized in bilayer films of CdO supporting adjacent SPP and ENZ modes. The hybridized SPP‐ENZ dispersion displays a prominent an...
Article
Full-text available
A broadband coplanar waveguide fed butterfly shape slot antenna is presented in this paper. The designed antenna operates in the frequency range from 1.89 to 5.21 GHz (93.5%) for S11 ≤ −10 dB with a broadside gain of 5 ± 1 dBi over the bandwidth of 1.97–5.19 GHz (90.3%). The designed antenna is uniplanar having the size of 0.5 λ0 × 0.28 λ0 × 0.005...
Article
Full-text available
The bending bright spatial optical soliton generation in a photorefractive Fe-doped lithium niobate (LN:Fe) crystal controlled by pyroelectric effect is demonstrated experimentally. A single-mode laser radiation at 632.8 nm wavelength, beam powers of 0.5–10 mW and LN:Fe sample with 10 mm thickness are used in the experiments. The crystal heating/co...
Article
Full-text available
The nonlocal emitter-waveguide coupling, which gives birth to the so called giant atom, represents a new paradigm in the field of quantum optics and waveguide QED. We investigate the single-photon scattering in a one-dimensional waveguide on a two-level or three-level giant atom. Thanks to the natural interference induced by the back and forth phot...