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[IEEE 2019 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) - Boston, MA, USA (2019.5.29-2019.5.31)] 2019 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) - Highspeed Broadband Optical Modulation with Small Footprint Symmetrical IMI Graphene Hybrid Plasmonic Waveguide
摘要： The modal properties and modulation characteristics of the fundamental gap mode supported by nanowire based symmetrical IMI graphene hybrid plasmonic waveguide are investigated employing the finite element method. The proposed modulator even with its remarkably small footprint offers both high extinction ratio (as high as 40 dB) and large modulation bandwidth (as large as 237 GHz) simultaneously with only 2.4 μm long active region at the telecommunication wavelength. The optical capacitance effect along with IMI like mode coupling are reported here for this improved modulation performance. Furthermore, a deep subwavelength mode size (~λ2/400) with low energy consumption per bit (as small as 0.9 fJ/bit) suggests its highly dense integration in photonic integrated circuits. Also, the performance variation of this waveguide is explored with respect to the alteration of operating wavelength and cross-sectional geometry.
关键词： hybrid plasmonic waveguide,Extinction ratio,surface plasmon polariton,graphene,optical capacitance
更新于2025-09-12 10:27:22
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Mid-infrared sensing properties of a plasmonic metal-insulator-metal waveguide with a single stub including the defects
摘要： A highly sensitive surface plasmon polariton (SPP) based sensor with a simple structure that composes of a metal-insulator-metal waveguide with a single stub including several silver nanorod defects, is designed and numerically investigated using finite element method for the applications of refractive index sensors and temperature sensors. The simulation results show that the existence of silver nanorod defects in the single stub have a great influence on the sensitivity performance, which provides an additional degree to manipulate the system response in the nanometer scale. The refractive index sensitivity can be reached as high as 5140 nm/RIU (RIU is refractive index unit) and the temperature sensitivity is about 2.05 nm/0C, which can be further improved by varying the length of stub (h), radius of defect rod (r) and the number of defects (N) in the stub. The sensing characteristics of the proposed simple structure would pay the way for highly integrated optical circuits for designing nanoscale refractive index sensors and temperature sensors with the single stub including the defects.
关键词： integrated optical circuits,refractive index sensors,silver nanorod defects,metal-insulator-metal waveguide,temperature sensors,surface plasmon polariton,finite element method
更新于2025-09-12 10:27:22
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Ultrafast Plasmonic Optical Switching Structures and Devices
摘要： Plasmonic structures possess rich physics related to the sensitivity of plasmon resonance to the change in the environmental dielectric constant, the enhanced light scattering and optical extinction, and the local field enhancement enabled strong light-matter interactions, which have been applied in refractive-index sensors, optical feedback in various micro- or nano-cavity lasers, surface enhanced Raman scattering spectroscopy, and high-sensitivity molecular detection. However, ultrafast optical response is another important aspect of plasmons, which can be utilized to achieve switching of optical signals in different spectral bands. These optical switching designs are very important for applications in optical logic circuits and optical communication system. In this review, we summarize a series of reports on ultrafast plasmonic optical switches, where we focus our discussions on the structural and device designs, instead of on their physics. By categorizing the designs of optical switches into different groups by their featured performances, we intend to propose the development trend and the commonly interested mechanisms of such ultrafast optical switches. We hope this review will supply helpful concepts and technical approaches for further development and new applications of ultrafast optical switching devices.
关键词： plasmonic device,metal oxides,plasmonic nanostructures,ultrafast optical switching,noble metals,surface plasmon polariton,hybrid plasmons,2D materials
更新于2025-09-12 10:27:22
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[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Bifunctional metasurface for polarization-controlled beam steering and excitation of spoof surface plasmon polariton
摘要： Based on the combination of propagation phase with geometric phase, to the best of our knowledge, a new reflective metasurface which can control the direction of reflected waves and excite spoof surface plasmon polariton (SSPP) simultaneously is proposed and numerically demonstrated for the circular polarization incident waves. The incident waves can be converted into SSP with longitudinal wave vector kx = 1.2 k0 or anomalously reflected with reflection angle (cid:2)r = 13.9o under the illumination of the left or the right circular polarization beam, respectively. The respective converting efficiency of the left and right circular polarization can reach up to 70% and 82% at the frequency of 0.3 THz. Our study may open up new routes for polarization-related antennas, detectors and other practical terahertz devices.
关键词： spoof surface plasmon polariton,SSPP,beam steering,polarization-controlled,metasurface
更新于2025-09-12 10:27:22
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[IEEE TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON) - Kochi, India (2019.10.17-2019.10.20)] TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON) - Analysis of Graphene Based Planar Antennas for Terahertz Application
摘要： The present work attempts to design graphene based plasmonic printed dipole and patch antenna resonating at 1 THz. These antennas are compared with their metal versions to bring out the reduction in the antenna length. The antenna parameters such as return loss and radiation pattern are studied and verified with the standard results of the metal counterpart.
关键词： Microstrip Patch antenna,Dipole antenna,Graphene,Surface Plasmon Polariton (SPP)
更新于2025-09-12 10:27:22
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Insulator-Metal-Insulator-Metal-Insulator and Metal-Insulator-Metal Vertical Directional Couplers with Surface Plasmon Polariton Waveguides
摘要： We propose two vertical directional couplers (VDCs) based on surface plasmon polariton (SPP) waveguides. One is an SPP insulator-metal-insulator-metal-insulator (IMIMI) VDC. The SPP IMIMI VDC is composed of two 45-(cid:2)m-long S bends, an L (cid:2)m-long straight waveguide, a 4-(cid:2)m-long C gap, and a 500-nm-long M gap. The other is an SPP metal-insulator-metal (MIM) VDC. The SPP MIM VDC is composed of two 10-(cid:2)m-long S bends, an L (cid:2)m-long straight waveguide, a 60-nm-long C gap, and a 500-nm-long M gap. Au is used as the metal and a low-loss polymer is used as the insulator in the IMIMI and MIM waveguides. In the SPP IMIMI VDCs, the excited 5.0 (cid:2)m × 4.5 (cid:2)m input S-s0 mode propagates along the S bend_1, propagates and couples along the straight waveguide L, and propagates again along the S bend_2. The losses due to the L region of the SPP IMIMI VDC are 1.33 dB when L = 13 (cid:2)m and 2.26 dB when L = 23 (cid:2)m and the coupling length is ～10 (cid:2)m In the SPP MIM VDCs, the excited 1.7 (cid:2)m × 0.5 (cid:2)m input G-s0 mode propagates along the S bend_1, propagates and couples along the straight waveguide L, and propagates again along the S bend_2. The losses of L of the SPP MIM VDC are 1.50 dB when L = 5 (cid:2)m and 11.20 dB when L = 65 (cid:2)m and the coupling length is ～65 (cid:2)m. The SPP IMIMI and MIM VDCs can be a potential step in the process of integration from micro-scale to nano-scale.
关键词： Plasmonic Device,Directional Coupler,Plasmonic Based Integrated Circuit,Surface Plasmon Polariton
更新于2025-09-12 10:27:22
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Homogenization of plasmonic crystals: seeking the epsilon-near-zero effect
摘要： By using an asymptotic analysis and numerical simulations, we derive and investigate a system of homogenized Maxwell’s equations for conducting material sheets that are periodically arranged and embedded in a heterogeneous and anisotropic dielectric host. This structure is motivated by the need to design plasmonic crystals that enable the propagation of electromagnetic waves with no phase delay (epsilon-near-zero effect). Our microscopic model incorporates the surface conductivity of the two-dimensional (2D) material of each sheet and a corresponding line charge density through a line conductivity along possible edges of the sheets. Our analysis generalizes averaging principles inherent in previous Bloch-wave approaches. We investigate physical implications of our ?ndings. In particular, we emphasize the role of the vector-valued corrector ?eld, which expresses microscopic modes of surface waves on the 2D material. We demonstrate how our homogenization procedure may set the foundation for computational investigations of: effective optical responses of reasonably general geometries, and complicated design problems in the plasmonics of 2D materials.
关键词： asymptotic analysis,homogenization,plasmonic crystals,Maxwell’s equations,surface plasmon-polariton,graphene
更新于2025-09-12 10:27:22
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Modeling of dielectric function in plasmonic quantum dot nanolaser
摘要： In this work we present a model of the dielectric function in plasmonic quantum dot (QD) nanolaser. A metal/semiconductor/metal structure was considered to attain plasmonic nanocavity with active region containing: QD, wetting layer and barrier. The dielectric function was calculated for both metal (Ag) and QD structure. The propagation constant of surface plasmon polariton (SPP) at the interface of Ag/InAs-QD structure was calculated and the dispersion relation of the plasmonic QD structure was evaluated. For frequencies far from plasma one, the gap between real and imaginary parts was large and a deviation from linear relation was obvious. The SPP field was strongly localized at the interface due to the effect of zero-dimensional QD structure which has application in the super-resolution and best sensitivity in optical imaging. Results of propagation length of SPP ( Lspp ) also support this. According to the Lspp results, the damping in the SPP energy was low in the Ag/InAs-QD compared to that in the Ag/air interface. The obtained results are in the range of experimental ones.
关键词： Surface plasmon polariton,Ag/QD,Plasmonic QD structure
更新于2025-09-11 14:15:04
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Coupling between surface plasmon polariton and planar waveguide modes in the biosensor based on metal–insulator–metal/planar waveguide structure
摘要： In this paper, we propose a high performance biosensor which allows the coupling between surface plasmon polariton (SPP) mode in metal-insulator-metal waveguide and planar waveguide (PWG) mode. The reflection curve exhibits a sharp dip originated from PWG mode when there is a weak coupling between SPP and PWG modes. The strong coupling between SPP and PWG modes results in symmetric Fano resonance and plasmon-induced transparency. The sensitivities of PWG mode dip and Fano resonance achieve 9733 and 7050 RIU?1, respectively, which are enhanced by 2～3 orders of magnitude compared to those of conventional surface plasmon resonance sensors.
关键词： Coupling,Planar waveguide mode,Surface plasmon polariton mode,Biosensor,Fano resonance
更新于2025-09-11 14:15:04
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Handbook of Graphene || Graphene‐Based Plasmonic Components for THz Applications: Planar Ring Array Devices
摘要： In this chapter, we present graphene-based planar components for THz applications. Firstly, the symmetry properties of the array are analyzed by using group-theoretical methods. Then numerical simulations of several components are discussed. The first component can operate as an electromagnetic filter. It is a planar array based on graphene elements. A unit cell of the array consists of two graphene rings arranged coaxially on the opposite sides of a dielectric substrate. The rings coupled electromagnetically possess dipole resonances of plasmonic modes. We show that the frequency position of the transmission peak can be varied in a wide range by the graphene chemical potential. Another example is a new electromagnetic tunable multifunctional component. The structure consists of a square array of graphene elements placed on both sides of a thin dielectric. Changing the graphene chemical potential electrostatically, the central frequencies of the pass-band and stop-band filter can be dislocated. This corresponds to a dynamic control of the filter. A combination of a high peak and a deep valley in the transmission response allows one to create a switch and a modulator in two separated frequency bands.
关键词： filter,surface plasmon polariton,terahertz,Graphene
更新于2025-09-11 14:15:04