Sheng-Xuan Xia

Sheng-Xuan Xia
Hunan University · School of Physics and Electronics

Doctor of Science

About

63
Publications
11,575
Reads
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1,735
Citations
Additional affiliations
September 2013 - June 2018
Hunan University
Position
  • PhD Student

Publications

Publications (63)
Article
To achieve plasmonically induced transparency (PIT), general near-field plasmonic systems based on couplings between localized plasmon resonances of nanostructures rely heavily on the well-designed interantenna separations. However, the implementation of such devices and techniques encounters great difficulties mainly to due to very small sized dim...
Article
We propose to achieve multi-band perfect plasmonic absorptions with peak absorptivity >99%>99% via the excitation of standing-wave graphene surface plasmon polaritons using single-layer graphene-based rectangular gratings. For the case with continuous gratings, perfect absorptions are only allowed for even-order modes, while the absorptions are qui...
Article
Here we study the possibility to achieve polarization-independent optical absorption in stacked anisotropic 2D material nanostructures (NSs). Focusing on black phosphorus , we demonstrate that by crossly stacking even-layered NSs, surface plasmons resonant in the two lattice directions are complementary excited, leading to polarization-independent...
Article
Due to its transparent and highly dispersive nature, plasmonically induced transparency (PIT) has become an attractive field in the on-chip control of light. Conventional methods to achieve PIT are only limited to the lowest dipole-dipole or dipole-combined quadrupole modes by breaking structural symmetry. Consequently, a general methodological fra...
Article
Full-text available
We propose to achieve dual plasmon-induced transparency (dual-PIT) effects through the couplings between a bright mode and two dark modes in a metamaterial system with two graphene sheets separated by periodic graphene gratings. We find that both the number and the positions of the transparent windows can be modulated by tuning the Fermi energy and...
Article
Full-text available
Strong near-infrared absorption of light in semiconducting transition metal dichalcogenides (TMDs) is essential for improving the photocarrier extraction efficiency in optoelectronic devices. Here, we numerically demonstrate that an original TMD Huygens metasurface is specifically designed to overcome the 50% absorptance limit of a subwavelength th...
Article
Terahertz sensing is one of the most promising methods for label free and noninvasive detection of refractive index changes. However, the figure of merit (FOM) of terahertz sensor has been low due to the low radiation and absorption loss of terahertz wave. In this paper, a metamaterial sensor based on gold and silicon dioxide is proposed. The struc...
Article
In this paper, we present an easy-to-implement metamaterial absorber based on bulk Dirac semimetal (BDS). The proposed device not only obtains an ultrahigh quality factor (Q-factor) of 4133 and dynamic adjustability at high absorption, but also exhibits an excellent sensing performance with a figure of merit (FOM) of 4125. These outstanding propert...
Article
We propose a composite metasurface composed of InSb strips and SiO2a substrate, which can achieve multi-band coherent perfect absorption (CPA) in the terahertz frequency range. It is demonstrated that InSb strips of different sizes support independent plasmon resonances at different frequencies, which is a linear superposition of each subunit. The...
Poster
Full-text available
Since the milestone work reporting the first exfoliation of monolayer graphene in 2004, two-dimensional (2D) materials have attracted extensive attention from both scientific and industrial communities. Compared with their bulky parental materials, these atomically thin layered materials exhibit many exceptional electrical and optical properties, a...
Poster
Full-text available
https://www.frontiersin.org/research-topics/21001/2d-plasmons-new-properties-methods-and-applications
Poster
Full-text available
Metamaterials, artificially structured materials consisting of periodically arranged subwavelength resonators, can produce unique physical properties not available in naturally occurring or traditionally synthesized materials. They emerged as a rule breaker to challenge the fundamental laws of the field of electromagnetism, and soon became a versat...
Preprint
Full-text available
Properties of graphene plasmons are greatly affected by their coupling to phonons. While such coupling has been routinely observed in both near-field and far-field graphene spectroscopy, the interplay between coupling strength and mode losses, and its exceptional point physics has not been discussed. By applying a non-Hermitian framework, we identi...
Article
Coherent absorption, as the time-reversed counterpart to laser, has been widely proposed recently to flexibly modulate light-matter interactions in two-dimensional materials. However, the multiband coherent perfect absorption (CPA) in atomically thin materials still has been elusive. We exploit the multiband CPA in vertically stacked metal/dielectr...
Article
Full-text available
Abstract General plasmonic systems to realize plasmonically induced transparency (PIT) effect only exist one single PIT mainly because they only allow one single coupling pathway. In this study, we propose a distinct graphene resonator-based system, which is composed of graphene nanoribbons (GNRs) coupled with dielectric grating-loaded graphene lay...
Article
Full-text available
An amendment to this paper has been published and can be accessed via the original article.
Article
Full-text available
General two-dimensional (2D) material-based systems that achieve plasmonically induced transparency (PIT) are limited to isotropic graphene only through unidirectional bright-dark mode interaction. Moreover, it is challenging to extend these devices to anisotropic 2D films. In this study, we exploit surface plasmons excited at two crossed grating l...
Article
Circular dichroism (CD) is widely applied in chemistry and biology, because chiral molecules can be detected and distinguished by analyzing the value of CD in the terahertz (THz) spectrum, which covers the characteristic spectrum of semiconductors, plasmas, and biomolecules. However, traditional metal metastructures cannot tune the wavelength of CD...
Article
Full-text available
Traditional absorbers are usually sandwich structures in which a metallic ground plane is employed to prevent the transmission. Such absorbers suffer from a major drawback that incident light can only irradiate from the front of the absorbers. In this paper, a novel absorber with bulk Dirac semimetal (BDS)-AlCuFe quasicrystals is proposed to realiz...
Article
Full-text available
For non-invasive detection, terahertz (THz) sensing shows more promising performance compared to visible and infrared regions. But so far, figure of merit (FOM) of THz sensor has been exceeding low due to weak radiation and absorption loss. Here, we propose an easily implemented THz sensor based on bulk Dirac semimetal (BDS). The presented structur...
Article
We propose and investigate a tunable dual-band perfect absorber consisting of double asymmetric L-shaped graphene resonators (LSGRs) and a metal ground plane spaced by a thin SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> dielectric layer. The numerical results reveal that the presented ab...
Article
Plasmonic metasurfaces made from coupled nanostrips with stubs demonstrate electromagnetically induced transparency (EIT) resonances. We exploit novel approaches of presenting the phenomenon by using the near-field coupling between two specific radiative resonances to generate two distinct EIT windows within a relative short wavelength range. Furth...
Article
Integrated dielectric metamaterials with plasmonic structures can cause drastic optical resonances and strengthen the capacity of light absorption. Here, we describe the optical properties of silicon nanoarrays on a thin silver film for extreme light confinement at subwavelength nanoscales. We attain the nearly total absorption in silicon nanostrip...
Article
Full-text available
We introduce a remarkably simple coplanar nanostructure consisting of two longer and one shorter graphene nanorods to support a Fano resonance, which arises from the coupling between bright mode and dark mode by breaking the geometrical symmetry. Simulation results, performed with the finite-difference time-domain (FDTD) method, show that the res-o...
Article
We demonstrate multiple Fano resonances in an integrated single dark mode hybrid metamaterial waveguide structure, which consists of three gold cut wires placed on a dielectric board waveguide. With a symmetrical pattern, the design shows double sharp Fano peaks with high $Q$ -factors of 950 and 216, which are attributed to the interaction between...
Article
Full-text available
Near-field coupled plasmonic systems generally achieve plasmonically induced transparency (PIT) using only one-way bright–dark mode coupling. However, it is challenging to realize such well-designed devices, mainly because they depend significantly on the polarization direction. We exploit surface plasmons supported by two crossed layers of graphen...
Article
The investigation of plasmon induced transparency (PIT) resonances is performed in a system based on defective and complete silver nanostrips. The response of metasurface systems to electromagnetic fields under normal incidence is endowed by unique features, including some exquisite spatial phenomena. These phenomena are embodied in confined light-...
Article
We propose a dynamically adjustable plas-mon-induced transparent (PIT) plane device consisting of a peri-odic H-shaped graphene resonator (HSGR). For the symmetrical pattern, only dipole resonance is observed at a normal incidence excited with electric field along the x direction. Once the asym-metry is introduced into the structure, the magnetic d...
Article
Full-text available
We present a high-performance refractive index sensor based on Fano resonance with a figure of merit (FOM) about 56.5 in all-dielectric metasurface which consists of a periodically arranged silicon rings with two equal splits dividing them into pairs of arcs of different lengths. A Fano resonance with quality factor ~133 and spectral contrast ratio...
Article
Full-text available
We present a multi-band terahertz absorber formed by periodic square metallic ribbon with T-shaped gap and a metallic ground plane separated by a dielectric layer. It is demonstrated that absorption spectra of the proposed structure consist of four absorption peaks located at 1.12, 2.49, 3.45, and 3.91 THz with high absorption coefficients of 98.0,...
Article
Full-text available
We demonstrate the existence of Fano resonance spectral response in a system of nanoscale plasmonic resonant ring stacked by means of a half nanoring. Our proposed scheme exploits the stacked method under normal incidence to excite the subradiant mode. The nanostructure, which utilizes the combination of Fano resonance and polarization-resolved, ha...
Article
We theoretically and numerically demonstrate multi-spectral plasmon induced transparency (PIT) in three-dimensional metamaterials comprising of parallel nanorods and a vertical nanorod. By moving the vertical middle nanorod to break the structural symmetry, the structure presents single-spectral or dual-spectral PIT windows, while it exhibits multi...
Article
We numerically and theoretically demonstrate a plasmon-induced transparency (PIT) at the mid-infrared region with finite-difference time-domain method. The system consists of an optically bright dipole mode and a dark quadrupole mode, which are supported by the graphene nanoring and graphene nanostrips, respectively. The coupling between the two mo...
Article
In this paper, we propose a structure composed of two graphene waveguides and dual coupled graphene ring resonators (GRRs) to achieve a plasmon-induced absorption (PIA) effect. A three-level plasmonic system and a temporal coupled mode theory (CMT) are utilized to verify the simulation results. Moreover, a double-windowPIA effect can be convenientl...
Article
Contents 1、 The influence of the coupling distances on the transmission spectrum. 2、 The interplay among adjacent structures in the integrated circuits.
Article
In this paper, we demonstrate the combination of a dielectric metasurface with a graphene layer to realize a high performance toroidal resonance based optical modulator. The dielectric metasurface consists of two mirrored asymmetric silicon split-ring resonators (ASSRRs) that can support strong toroidal dipolar resonance with narrow line width (~0....
Article
A tunable electromagnetically-induced-transparency–like (EIT-like) device is proposed numerically and theoretically in the mid-infrared region, which is composed of periodically patterned ring and disk graphene. Distinguished from the commonly used three-level system, the hybridization of the plasmon mode is applied to describing and explaining the...
Article
We demonstrate plasmon-induced absorption (PIA) in an ultra-compact graphene waveguide system which is composed of a single graphene sheet with two air cavities side-coupled to a graphene nanoribbon. By designing two coherent optical pathways, the pronounced PIA can be achieved due to the extreme destructive interference between the radiant and sub...
Article
Abstract—An optical waveguide for working in mid-infrared range is highly desirable. However, such a waveguide is required to yield a long propagation distance and deep subwavelength confinement. Although the graphene-based surface plasmon polariton (SPP) waveguides have exhibited some potential in this regard, their propagation lengths are current...
Article
Full-text available
Tunable plasmon-induced transparency (PIT) is realized for the mid-infrared region only by using two parallel graphene nanostrips. The weak hybridization between the two bright modes results in the novel PIT optical response. The performance of the PIT system can be controlled by changing the geometry parameters of graphene nanostrips. At the same...
Article
Plasmon induced transparency (PIT) with graphene metamaterials is investigated with the finitedifference time-domain method. Interestingly, the modulation of the PIT transparency window can be achieved by changing not only the gap distance between the two resonators but also the polarization angle of the excitation light. The three-level plasmonic...
Article
One of the key challenges that graphene plasmonics face is to achieve efficiently coupling to external light. In this paper, this difficulty is overcome by a concept that is capable of exciting localized surface plasmon polaritons (SPPs) in flat gratings formed by sinusoidally shaping graphene nanoribbons (GNRs). These gratings enable the parallel-...
Article
One of the important challenges that graphene must overcome before it can legitimately declare its irreplaceable position among the fields of plasmonic materials is to achieve efficiently coupling to external light. In this paper, we demonstrate an effective solutions to this problem by exciting localized surface plasmon polaritons (SPPs) on graphe...
Article
Full-text available
The phenomenon of plasmon-induced transparency (PIT) is realized a in surface plasmon polariton waveguide at near-infrared frequencies. The right-angled slot and rectangle cavity placed inside one of the metallic claddings are respectively utilized to obtain bright and dark modes in a typical bright-dark mode waveguide. A PIT transmission spectrum...
Article
Graphene nanoribbon (GNR), as a fundamental component to support the surface plasmon waves, are envisioned to play an important role in graphene plasmonics. However, to achieve extremely confinement of the graphene surface plasmons (GSPs) is still a challenging. Here, we propose a scheme to realize the excitation of localized surface plasmons with...
Article
Full-text available
A graphene-based cylindrical hybrid surface plasmon polariton waveguide, composed of a silicon nanowire core surrounded by a silica layer and then a graphene layer, is investigated using the finite-difference time-domain method. The analytical solutions and the numerical simulation show that an ultra-small mode area and a large propagation length c...
Article
Asymmetric plasmonic waveguides with a shoulder-coupled rectangle cavity are proposed and investigated numerically by using the finite-difference time-domain (FDTD) method. The symmetry breaking of the structure results in a new discrete mode supported by the cavity. The extreme interference between two discrete states and an intrinsic wide continu...
Article
In this letter, the plasmonic system composed of a defective silver nanostrip and a complete silver nanostrip is theoretically investigated to achieve two Fano resonances. A quadrupole mode cannot be directly excited on a complete nanostrip, while it can be fulfilled by introducing the defect. This defective silver nanostrip supports both of the su...
Article
Double electromagnetically induced transparency (EIT)-like resonances are numerically achieved by detuning and bright-dark coupling in an asymmetric plasmonic waveguide resonator system. The transmission properties of the system are simulated by the finite-difference time-domain (FDTD) method. Just because double EIT-like resonances originate from...
Article
We present a plasmon-induced absorption (PIA) sensor formed by using a notched metallic film and a metallic ground plane separated by dielectric gratings, suggesting perfect absorption and high sensitivity up to ~105. The absorption mechanism for the narrow-band sensor involves the phase-dependent coupling between the localized surface plasmon reso...
Article
An erratum is presented to correct the typing mistake in a equation in Sect. 3.1 of [Opt. Express24, 427-436 (2016)].
Article
A graphene-based long-range surface plasmon polariton (LRSPP) hybrid waveguide, which is composed of two identical outer graphene nanoribbons and two identical inner silica layers symmetrically placed on both sides of a silicon layer, is investigated using the finite-difference time-domain method. By combining the simulated results with the coupled...
Article
To achieve efficiently coupling to external light is still remaining an insurmountable challenge that graphene faces before it can play an irreplaceable role in the plasmonic field. Here, this difficulty is overcome by a scheme capable of exciting graphene surface plasmons (GSPs) in in-plane bended gratings that are formed by elastic vibrations of...
Article
Full-text available
We obtain a special Fano-like resonance in a semi-closed T-shaped waveguide with nanodisk resonator, in which only two bright plasmon modes work. It is found that the transmission spectrum occurs a red-shift by increasing either length of the nanoslot or radius of the nanodisk. Moreover, when the length of the nanoslot and radius of the nanodisk re...

Projects

Projects (2)
Archived project
Project
Graphene Plasmonics, Surface plasmons, Plasmon Excitation, Waveguides, Plasmonic Filters, Plasmonic Sensors, Plasmonicaaly Induced Transparency.