Showing papers in "Journal of Electromagnetic Waves and Applications in 2015"
TL;DR: In this article, a new model of magneto-thermoelasticity theory has been constructed in the context of a new consideration of heat conduction with memory-dependent derivative.
Abstract: In this work, a new model of magneto-thermoelasticity theory has been constructed in the context of a new consideration of heat conduction with memory-dependent derivative. One-dimensional application for a perfect electrically conducting half-space of elastic material, which is thermally shocked, in the presence of a constant magnetic field has been solved by using Laplace transform technique. According to the numerical results and its graphs, conclusion about the new theory of magneto-thermoelasticity has been constructed and compared with dynamic classical coupled theory.
68 citations
TL;DR: A new deterministic approach to the synthesis of linear arrays having the least possible number of elements while radiating shaped beams lying in completely arbitrary power masks is proposed.
Abstract: We propose a new deterministic approach to the synthesis of linear arrays having the least possible number of elements while radiating shaped beams lying in completely arbitrary power masks. The approach takes joint advantage from compressive sensing (CS), from the multiplicity of power patterns lying in a given mask, and from the multiplicity of field solutions corresponding to each of these power patterns. Care is taken in order to exploit the available degrees of freedom in an effective fashion, and in optimizing parameters that affect the CS performance. An extensive numerical comparison against state-of-the-art procedures proves the effectiveness of the approach.
49 citations
TL;DR: In this article, the authors proposed a broadband metamaterial perfect absorber (MPA) that operates in the ultraviolet and the visible regions of the electromagnetic spectrum, which is of nanoscale in size and comprised of three layers.
Abstract: The design of broadband metamaterial perfect absorber (MPA) is proposed that operates in the ultraviolet and the visible regions of the electromagnetic spectrum. The MPA structure is of nanoscale in size and comprised of three layers – the U-shaped resonators (made of gold) of subwavelength size are embedded over a nanolayer of dielectric medium (silica glass), which is backed by a copper nanolayer surface. It is found that the proposed structure yields absorption peaks with the absorptivity over 99% in the aforesaid spectral range corresponding to both the transverse electric and the transverse magnetic polarizations of the incident electromagnetic wave. Furthermore, the angular dependence (of the incident light) of absorption characteristics is also analyzed along with the behavior of the absorber under varying thickness of nanosized resonators. It is expected that the proposed kind of perfect absorber would be highly useful in integrated heat-absorbing mediums that would include sensors, integrated pho...
43 citations
TL;DR: In this paper, an analytical treatment of the undulator radiation (UR), accounting for major sources of the spectral line broadening, for example, the beam energy spread, the emittance, and a constant magnetic field, additional to the ideal periodic fields, is presented.
Abstract: We present an analytical treatment of the undulator radiation (UR), accounting for major sources of the spectral-line broadening, for example, the beam energy spread, the emittance, and a constant magnetic field, additional to the ideal periodic fields. The examples of high harmonic generation in one- and two-frequency undulators are considered with account for homogeneous and inhomogeneous broadening in real devices. Qualitative estimations are given as well as the exact analytical expressions for the UR spectrum, and intensity are obtained and simplified in the case of high-energy electrons. The compensation of the divergency by the constant magnetic field is demonstrated in the analytical form. The application for free-electron lasers (FEL) is demonstrated and compared with the radiation of a FEL on the supposition of an ideal undulator.
42 citations
TL;DR: In this article, a novel time domain practical scheme is proposed to reconstruct the dielectric image of the inhomogeneous multi-layered media, which employs the measured scattering data of the test media in equivalent time domain.
Abstract: In this paper, a novel time domain practical scheme is proposed to reconstruct the dielectric image of the inhomogeneous multi-layered media. The overall process is noninvasive and noncontacting, which employs the measured scattering data of the test media in equivalent time domain. The measurement system consists of a modern vector network analyzer, a wide-band lens horn antenna, and the associated microwave components. The main focus here is to determine both the relative permittivity and the thickness of each layer in terms of the partial reflection coefficient calculated for the corresponding interface. It is also demonstrated here that the proposed approach can be used to characterize the lossy media under some approximation. The proposed approach is quite useful under situations such as the through-wall imaging, where only reflection measurements can be carried out due to restricted access of the object from the other side. The proposed scheme is validated here by determining the permittivity, the t...
42 citations
TL;DR: The present design mainly focuses on the current trends in the development of wireless body area networks for many wireless communications such as GPS, PCS-1900, IMT-2000/UMTS, WiFi, Bluetooth, and UWB applications.
Abstract: In this study, a novel textile fractal antenna is designed and optimized using genetic algorithm for super-wideband applications. The antenna design is based on the iterations of triangular–circular patch and a partially modified elliptical ground plane. Results show that the proposed antenna presents impedance bandwidth (return loss < −10 dB) covering the range of frequencies from 1.4 to 20 GHz. The present design mainly focuses on the current trends in the development of wireless body area networks for many wireless communications such as GPS, PCS-1900, IMT-2000/UMTS, WiFi, Bluetooth, and UWB applications.
37 citations
TL;DR: In this paper, a point-defect resonant cavity in the sandwiched waveguide with triangular lattice of air holes is used to sense small refractive index changes in 2D photonic crystal (PhC).
Abstract: In this work, we design a new biosensor concept that uses a microcavity in 2D photonic crystal (PhC) to sense small refractive index (RI) changes. The RI sensor is formed by a point-defect resonant cavity in the sandwiched waveguide with triangular lattice of air holes. The properties of the sensor are simulated using the finite-difference time-domain method. The calculation results show that a change in ambient RI is apparent; the sensitivity of the sensor is achieved. We succeeded to obtain a new sensitivity value of 425 nm/RIU with a detection limit of 0.001 RIU, which proves the ability of the structure to produce biosensor PhC.
37 citations
TL;DR: In this paper, a wideband switchable frequency selective surfaces (FSS) absorber/reflector for C-band (4-8 GHz) application of smart stealth system is presented.
Abstract: A wideband switchable frequency selective surfaces (FSS) absorber/reflector for C-band (4–8 GHz) application of smart stealth system is presented. This switchable FSS has novel properties that combine wideband absorption and switchable performance over the entire operational band. Nested treble split-rings are used to accomplish wideband and switchable performance of normal incidence. The split-rings are coupled together to create broadband resonance based on effect of superimposed resonance. By switching connected state of above split using PIN diodes in the outmost ring, we are able to control the working state of FSS. In OFF state, the switchable FSS works as a wideband absorber. The −9 dB bandwidth is 3.2 GHz (4.1–7.3 GHz). In ON state, the switchable FSS has fine reflective property. The average reflectivity is −2.8 dB in the operational band. The switchable FSS is computed by full-wave numerical simulation. The samples are fabricated and tested to verify the proposed concept. The experimental result...
36 citations
TL;DR: In this article, the perfect metamaterial absorber (MA) based on square resonator with gap configuration is numerically and experimentally investigated for GHz and THz frequency regime.
Abstract: The new perfect metamaterial absorber (MA) based on square resonator with gap configuration is numerically (for GHz and THz frequency regime) and experimentally (for GHz frequency regime) presented and investigated. The proposed MA has a simple configuration which introduces flexibility to adjust its metamaterial properties and easily rescale the structure for other frequency regimes. In addition, polarization and incident angle independencies of the proposed model are analyzed for the THz frequency regime. The suggested structure could achieve very high absorption at wide angles of polarization and incident angles for both transverse electric and transverse magnetic waves. At resonance frequencies, absorption results are realized around 99.99% at 5.48 GHz and 99.92% at 0.865 THz for their respective frequency regimes. Besides numerical results in GHz and THz frequencies, experimental results are also obtained for GHz frequency regime. The proposed MA and its variations enable myriad potential application...
35 citations
TL;DR: In this article, a multilayer approach is applied for obtaining the good absorption, where thickness of different layers is optimized by genetic algorithm, and the effective absorption bandwidth for two and three-layer composite absorber is 3.5 and 2.8 GHz for the optimized thickness 1.9 and 1.8mm, respectively.
Abstract: Very few literatures are available on the utilization of natural waste composite materials for radar wave absorption. The main objective of this paper was to achieve good absorption with wide bandwidth corresponds to reflection loss (RL) ≤ −10 dB for less absorber layer thickness (≤2.0 mm) for a cost-effective production of radar wave absorber. In this study, mineral dust and beach sand-based waste composite material is critically analyzed for its application as broadband radar wave absorber in the frequency range of 8.2–12.4 GHz. A multilayer approach is applied for obtaining the good absorption, where thickness of different layers is optimized by genetic algorithm. The effective absorption bandwidth for two- and three-layer composite absorber is 3.5 and 2.8 GHz for the optimized thickness 1.9 and 1.8 mm, respectively. The two-layer absorber possesses measured RL of −27.20 dB at 10.8 GHz and for a three-layer absorber, RL reaches up to −32.58 dB at 11.2 GHz. The measured RL values agree quite well with t...
34 citations
TL;DR: In this paper, a microwave biosensor based on chiral metamaterials (MTMs) was proposed to detect pig biological tissues which are widely used as a trial for medical explorations and researches.
Abstract: In this paper, we have designed, simulated, and analyzed a microwave biosensor based on chiral metamaterials (MTMs) to detect pig biological tissues which are widely used as a trial for medical explorations and researches. There are various types of biosensor structures based on MTMs in the literature. However, only a limited number of study is conducted on biosensors based on chiral MTMs; therefore, our study is one of the pioneer works for this type of research. The proposed diamond-shaped resonator-based structures are numerically investigated and analyzed in detail in the microwave frequency regime. The results are in good agreement which lead us to conclude that our structure can be easily used as an effective instrument for biosensing applications in medical technologies.
TL;DR: In this paper, a novel design of electromagnetic wave absorber is presented with the characteristics of broad bandwidth, low profile, and polarization independence to a normal incident electromagnetic wave, which is composed of a single-layer, highly resistive frequency selective surface layer printed on a 1-mm-thickness foam substrate.
Abstract: A novel design of electromagnetic wave absorber is presented with the characteristics of broad bandwidth, low profile, and polarization independence to a normal incident electromagnetic wave. The absorber is composed of a single-layer, highly resistive frequency selective surface layer printed on a 1-mm-thickness foam substrate. It is observed that the absorptance of 90% or greater in the frequency range of 20–31 GHz has been achieved. It is also found that good electromagnetic wave absorption is achieved for a wide incident wave angle spanning up to 40°. An equivalent circuit modal for the proposed absorber has been developed using an ADS schematic circuit, which shows a fairly good consistency with that derived from high frequency structure system field solver in the frequency range of interest.
TL;DR: In this article, the authors proposed a dual-band metamaterial absorber with gap-loaded varactor diode that operates in the microwave frequency regime, achieving perfect absorption of 99.91 and 84.79% for both frequencies of 5.01 and 4.79 GHz, respectively.
Abstract: This paper introduces an electromagnetic (EM) energy harvesting application based on tunable dual-band metamaterial absorber (MA) which includes a ring resonator with gap loaded varactor diode that operates in the microwave frequency regime. Although the suggested tunable structure has a very simple geometry, it provides perfect absorption of 99.91 and 84.79% for both frequencies of 5.01 and 4.79 GHz, respectively. It is concluded from the numerical analysis that it can be obtained higher voltage value on varactor diode when the metal plate is added on the structure, to achieve perfect absorber with EM energy harvesting. We also present a numerical analysis in order to explain physical interpretation of the harvesting mechanism in detail. A sensor application of the proposed structure is introduced in order to show an additional feature of the model. Moreover, the proposed tunable model is also suitable for a wide variety of microwave EM energy harvesting applications such as power transfer to any compone...
TL;DR: This paper introduces and discusses an innovative approach to focus the electromagnetic power carried by a vector field into a target point, while keeping the field level bounded elsewhere, in the case of 2D vector fields.
Abstract: This paper introduces and discusses an innovative approach to focus the electromagnetic power carried by a vector field into a target point, while keeping the field level bounded elsewhere. To overcome the complexity of the underlying NP-hard problem, we introduce a multi-objective optimization framework based on convex programming sub-problems. Notably, such a strategy has the unique capability of achieving the globally optimal solution by means of local search algorithms. A numerical analysis is reported to assess the methods’ performance, including a comparison with previous contributions. The proposed approach is herein presented in the case of 2D vector fields (transverse electric polarization) but it can be easily extended to the general 3D case.
TL;DR: In this article, an alternative solution for the mathematical analysis of the fractional waves in dielectric media is presented, where the appropriate fractional dimensional parameters are introduced to characterize consistently the existence of fractional space and time derivatives.
Abstract: This work presents an alternative solution for the mathematical analysis of the fractional waves in dielectric media. For the fractional wave equation, the Caputo fractional derivative was considered, the order of the spatial and temporal fractional derivatives are , respectively. In this analysis, we introduce the appropriate fractional dimensional parameters which characterize consistently the existence of the fractional space and time derivatives into the fractional wave equation. We will consider source free Maxwell equations in isotropic and homogeneous dielectric medium. The general solutions obtained in our research have been expressed in terms of the multivariate Mittag–Leffler functions, these functions depend only on the parameters and preserving the appropriated physical units according to the system studied.
TL;DR: In this paper, a low-profile and compact cylindrical dielectric resonator antenna along with circular slots and filtering structure for wireless application is reported, which is excited by annular-shaped microstrip line.
Abstract: In this article, low-profile and compact cylindrical dielectric resonator antenna along with circular slots and filtering structure for wireless application is reported. Proposed antenna is excited by annular-shaped microstrip line. Two ring-shaped resonators placed on opposite sides of feed line are working as a band-pass filter. These resonators are unified with wideband cylindrical dielectric resonator antenna and make it suitable for triple band operations with better isolation level. Dual ring-shaped parasitic slots on a partial ground plane are used to make CDRA more compact. The proposed triple band antenna has been analyzed, studied and optimized using Ansoft HFSS simulation software. Prototype of proposed geometry has been fabricated and tested. There is a better accord between simulated and measured results. The proposed design engenders three frequency bands i.e. 2.35–2.55 GHz; 3.35–3.65 GHz; and 5.1–5.42 GHz with a resonant frequency of 2.45, 3.55, and 5.35 GHz, respectively. Proposed antenna ...
TL;DR: In this article, a systematic review on the long-period fiber grating (LPFG) formed by the electric arcing method is presented, where the basic concept of LPFG and the background of the electric arc-induced LPFG are thoroughly discussed.
Abstract: This paper presents a systematic review on the long-period fiber grating (LPFG) formed by the electric arcing method. The basic concept of LPFG and the background of the electric arcing method are thoroughly discussed. The paper also discussed on the methods to improve the sensitivity of LPFG towards external perturbations. The LPFG has been reported to have potential usage as sensor, thus a section of the paper has focused on some application of arc-induced LPFG as sensors.
TL;DR: In this article, a rectangular shape of asymmetric dielectric resonator antenna (DRA) excited by a coaxial probe is proposed and investigated, which can offer an impedance bandwidth up to 51% for |S11|-<−10dB from 4.1 to 6.7 GHz.
Abstract: A rectangular shape of asymmetric dielectric resonator antenna (DRA) excited by a coaxial probe is proposed and investigated. The asymmetric DRA geometry can offer an impedance bandwidth up to 51% for |S11| < −10 dB from 4.1 to 6.7 GHz. The antenna covers most of the wireless systems like 5.2, 5.5, and 5.8 GHz WLAN/Wi-MAX applications. The experimentally measured result shows that the efficiency is above 90% for the bandwidth of operation. The simulated and measured radiation patterns are consistent throughout the operational bandwidth. The measured peak gain over the band is 8.2 dBi. It is also observed that the newly proposed configuration reduces the DRA volume by 26% as compared to conventional rectangular DRA, with compact volume of 8.24 cm3. Good match between the measured and simulated results has been obtained.
TL;DR: In this paper, a composite conductive yarn from stainless steel and polyester staple fiber with different fiber composition adopting worsted spinning system was successfully woven into variety of hybrid woven structures in the Picanol Gammax Rapier Loom.
Abstract: This article describes the preparation of composite conductive yarn from stainless steel and polyester staple fibre with different fibre composition adopting worsted spinning system. The conducting yarn was successfully woven into variety of hybrid woven structures in the Picanol Gammax Rapier Loom. The aim of this research was to develop conducting yarn of different conductivity level (linear resistance 6–9 kΩ/m to 150–200 Ω/m) and subsequent conversion of yarn into ultra-lightweight woven fabric (~100 gsm) for providing electro-magnetic interference/radio frequency interference shielding effectiveness to the electronic equipment/devices. The electromagnetic shielding effectiveness of these woven fabrics was evaluated in free space microwave measurement system in microwave frequency (8–18 GHz) for vertical and horizontal polarization of electromagnetic wave. EMSE of ~31 dB in single layer of fabric is achieved. The effect of various fabric parameters, i.e. yarn spacing, yarn density and weave structure, ...
TL;DR: In this paper, the role of bowtie gap in creating large and highly accessible local electromagnetic fields was investigated and a high-resolution and lift-off free fabrication method was introduced to enable bowtie apertures with gap sizes down to sub-10nm.
Abstract: Recently, bowtie-shaped apertures have received significant attention due to their extraordinary ability to generate dramatic field enhancement and light confinement in nanometer scale. In this article, we investigate both experimentally and theoretically nearfield and farfield responses of bowtie-shaped apertures in detail. We study the role of bowtie gap in creating large and highly accessible local electromagnetic fields. In order to experimentally excite strong local fields, we introduce a high-resolution and lift-off free fabrication method which enables bowtie apertures with gap sizes down to sub-10 nm. We also show that for identical geometries, bowtie-shaped apertures support much stronger local electromagnetic fields compared to particle-based bowtie-shaped antennas. We investigate the role of polarization on the gap effect, which plays the dominant role for creating strong nearfield intensities. Finally, we introduce a mechanism to fine-tune the optical response of bowtie apertures through geome...
TL;DR: In this article, a microwave resonant cavity has been designed and analyzed to evaluate the effect of RF electromagnetic field on enzyme reactions, and its behavior in the actual use has been evaluated using the COMSOL multiphysics.
Abstract: We present here the design and analysis of a microwave resonant cavity to evaluate the effect of RF electromagnetic field on enzyme reactions. The cavity has been first designed using CST Microwave Studio. Then, its behaviour in the actual use has been evaluated using the COMSOL multiphysics. The presented results show that such cavity can be quite effective.
TL;DR: In this article, scattering from a metal cylinder due to L-nihility, coated with dielectric material that encapsulates perfectly electric conducting sheath helix structure, is presented.
Abstract: In this article, scattering from silver metal cylinder due to L-nihility, coated with dielectric material that encapsulates perfectly electric conducting sheath helix structure, is presented. The orientation of helix can be altered, and the cases of both the parallel (TM) and the perpendicular (TE) polarizations of electromagnetic (EM) waves are analyzed. Co- and cross-polarized fields for different values of pitch angle are formulated under oblique angle of incidence. The bi-static echo width of the scatterer is investigated as a function of at the L-nihility frequency which lies within the optical frequency range. The results are compared with those obtained for perfect electric conductor (PEC) at different values of the angle of incidence. It is observed that the considered guiding structure behaves identically with the simple PEC cylinder under the situation when the helix structure is oriented parallel to the axial direction of the guide. However, for the other forms of the helix orientation, the str...
TL;DR: In this paper, a transparent microstrip patch antenna based on fluorine doped tin oxide (FTO) has been fabricated, analyzed, and compared with a copper patch/copper ground plane for 5 GHz resonance frequency.
Abstract: This paper presents a comprehensive investigation on the transparent microstrip patch antenna based on fluorine doped tin oxide (FTO). High quality FTO films have been deposited by spray pyrolysis technique and opto-electrical properties of the films were measured. Deposited films show 6.7–8.4 Ω/□ surface resistance and ~85% optical transparency. Substrate thickness effect on transparent conductor losses and theoretical transparency analysis using Drude model and thin film transfer matrix (TTM) method has been performed. Microstrip antennas with transparent patch/transparent ground plane, and copper patch/copper ground plane (as reference) for 5 GHz resonance frequency were fabricated, analyzed, and compared. The fabricated microstrip antenna with both transparent patch and ground plane shows 1.72 dBi gain at 5 GHz.
TL;DR: In this paper, a dual-band coplanar waveguide metamaterial filter based on generalized metamoretic transmission line was proposed. But the performance of the proposed filter has not yet been evaluated.
Abstract: This paper presents an ultra compact dual-band coplanar waveguide metamaterial filter based on generalized metamaterial transmission line. The detailed theoretical design steps of the filter are explained. The dual-band filter design performance has been validated using equivalent circuit modeling, electromagnetic full wave simulations, and practical measurement. The results illustrate the filter has dual passbands centered at 0.82 and 1.48 GHz with approximately 1 dB insertion loss and minimum 12 dB return loss. Good agreements between the circuit modeling, electromagnetic full wave simulations, and practical measurements are achieved. Moreover, the filter size is only (18 × 28 mm2) which is only less than (0.2λg × 0.31λg) at the center frequency of the first passband and (0.36λg × 0.56λg) at the center frequency of the second passband.
TL;DR: In this article, an epsilon-negative metasurface antenna (ENG-MS antenna) with high-gain and frequency-tunable properties is proposed, fabricated and studied.
Abstract: Various wireless communication systems require simple and high-gain radiating element operating in different working frequency bands. In this paper, an epsilon-negative metasurface antenna (ENG-MS antenna) with high-gain and frequency-tunable properties is proposed, fabricated and studied. This antenna is composed of an original double-sided printed bow tie antenna (source antenna) and an ENG-MS frequency selecting reflection layer. The strong electric interaction between ENG-MS (allowing evanescent wave only) and source antenna exhibits a significant effect on antenna’s radiation pattern and gain. Antenna’s gain can be selectively enhanced over the source antenna’s working frequency band. It is demonstrated that the resonant frequencies of this ENG-MS antenna can be continuously tuned by changing the distance between source antenna and ENG-MS. The proposed ENG-MS antenna in this paper shows a promising result to introduce metamaterials/metasurfaces in microwave device to realize high-gain and frequency-t...
TL;DR: In this article, a quasi-static analysis of scattering from a layered sphere in fractional dimensional space is presented, where layers include plasmonic and non-plasmonics materials.
Abstract: Quasi-static analysis of scattering from a layered sphere in fractional dimensional space is presented. The layers to be considered include plasmonic and/or non-plasmonic materials. Additionally, the space surrounding and occupied by the sphere is assumed to be fractional. The effects of layers and fractionality of dimensions on polarizability and potential distribution of the sphere are investigated. Numerical results for the same are presented for various combinations of layers and fractionality of the space.
TL;DR: In this article, a new ultra-wideband balun and its application for balanced antenna are presented, where two different types of microstrip to slotline transition forms are adopted for the unbalanced and balanced outputs of the balun.
Abstract: A new ultra-wideband balun and its application for balanced antenna are presented in this paper. To realize the balun-type function, two different types of microstrip to slotline transition forms are adopted for the unbalanced and balanced outputs of the balun. Further, an ultra-wideband balun and its integration with a Vivaldi antenna are designed and fabricated to validate the feasibility of the new approach. Results indicated that the proposed balun and the antenna can operate from 3.6 to 10.7 GHz. For the proposed new balun, it exhibits a good balanced performance of within 0.5 dB magnitude imbalance and less than 6° phase imbalance between the two balanced outputs. Meanwhile, the antenna reveals good unidirectional radiation patterns.
TL;DR: A nine-ring time-modulated concentric circular antenna array (TMCCAA) with isotropic elements has been analyzed based on an evolutionary optimization algorithm called particle swarm optimization (PSO) with Aging Leader and Challenger (ALC- PSO) for the reduction of side lobe level (SLL) and improvement in the directivity.
Abstract: In this paper, a nine-ring time-modulated concentric circular antenna array (TMCCAA) with isotropic elements has been analyzed based on an evolutionary optimization algorithm called particle swarm optimization (PSO) with Aging Leader and Challenger (ALC-PSO) for the reduction of side lobe level (SLL) and improvement in the directivity. Some other population-based evolutionary algorithms like real-coded genetic algorithm, PSO, and differential evolution (DE) have also been applied for the sake of comparative performance study of the same optimal designs. The comparative case studies as Case-1 and Case-2 are made with three control parameters like inter-element spacing in rings, inter-ring radii, and the switching “ON” times of rings with the help of same algorithms. ALC-PSO performs the dual task of improvement of directivity values as well as minimization of SLL of TMCCAA. Experimental results show a considerable SLL reduction with respect to the uniform case. Again, the results show Case-2 outperforms Ca...
TL;DR: A technique of automatic optimization for guiding structures at microwave range taking into account conflicting requirements with PSO algorithm and FDFD technique is presented.
Abstract: A technique of automatic optimization for guiding structures at microwave range is presented. Geometrical parameters have been optimized taking into account conflicting requirements (high bandwidth, high power handling capability and low attenuation constant) with PSO algorithm. Propagation performances are computed with a FDFD technique.
TL;DR: In this article, the dispersion relation of surface plasmon polaritons (SPPs) on a periodically corrugated semiconductor surface was investigated in the THz frequency range.
Abstract: We report on a theoretical investigation of the dispersion relation of surface plasmon polaritons (SPPs) on a periodically corrugated semiconductor surface. We assumed Drude’s permittivity model of the semiconductor, which accurately describes the loss of these spoof SPPs. In the THz frequency range, the properties of the dispersion and loss of spoof SPPs on corrugated Si surfaces are studied. A low-loss propagation of spoof SPPs can be achieved by an optimum design of the surface structure. It was found that by increasing the lattice constant or by reducing the groove depth, the investigated structure can provide a low guiding attenuation.