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[IEEE 2018 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Hong Kong, China (2018.11.5-2018.11.9)] 2018 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Surface Plasmon Polaritons Scattering by Strong Magnetic field in Two-dimensional Material
摘要： Scattering effect of surface plasmon polaritons in two-dimensional material based devices by magnetic fields are analytically studied within the framework of wave optics and plasma model. The theoretical explanation of magnetic scattering and related formulae are provided by considering plasmonic mechanics and solving the equation of motion of electron gas directly. Calculation results illustrating magnetic scattering phenomena are also given by applying an approximation to the first order.
关键词： two-dimensional materials,magnetic fields scattering,analytic methods,surface plasmon polaritons
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Studies on Surface Plasmon Dispersion Theory on the Bilayer Graphene Ribbon Arrays Metasurface
摘要： Graphene surface plasmon polaritons (SPP) provide a promising platform to develop a series of new photonic, plasmonic and optoelectronic devices from terahertz to optic spectrum owing to its excellent properties. In this paper, a new kind of graphene metasurfaces, i.e., bilayer graphene ribbon arrays separated by a dielectric gap is proposed. The general dispersion theory of SPP mode on the structure is investigated by a modal expansion method. Solving field expressions on different regions and using proper periodic boundary conditions, the analytical dispersion expressions of SPP mode are obtained on the bilayer graphene ribbon arrays for the first time. With this result, the SPP characteristics of dispersion and propagation loss can be calculated and analyzed with graphene and structural parameters. The proposed SPP modes on the bilayer graphene ribbon arrays metasurface can open up new ways to develop some low-loss sub-wavelength plasmonic waveguide, planar retroreflectors and the enhanced terahertz radiation source.
关键词： surface plasmon polaritons,bilayer graphene ribbon arrays,periodic boundary,dispersion theory
更新于2025-09-19 17:15:36
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Surface Polariton‐Like s‐Polarized Waveguide Modes in Switchable Dielectric Thin Films on Polar Crystals
摘要： Surface phonon polaritons (SPhPs) and surface plasmon polaritons (SPPs), evanescent modes supported by media with negative permittivity, are a fundamental building block of nanophotonics. These modes are unmatched in terms of field enhancement and spatial confinement, and dynamical all-optical control can be achieved, e.g., by employing phase-change materials. However, the excitation of surface polaritons in planar structures is intrinsically limited to p-polarization. On the contrary, waveguide modes in high-permittivity films can couple to both p- and s-polarized light, and in thin films, their confinement can become comparable to surface polaritons. Here, it is demonstrated that the s-polarized waveguide mode in a thin Ge3Sb2Te6 (GST) film features a similar dispersion, confinement, and electric field enhancement as the SPhP mode of the silicon carbide (SiC) substrate, while even expanding the allowed frequency range. Moreover, it is experimentally shown that switching the GST film grants nonvolatile control over the SPhP and the waveguide mode dispersions. An analytical model is provided for the description of the GST/SiC waveguide mode and it is shown that the concept is applicable to the broad variety of polar crystals throughout the infrared spectral range. As such, complementarily to the polarization-limited surface polaritons, the s-polarized waveguide mode constitutes a promising additional building block for nanophotonic applications.
关键词： waveguide modes,infrared spectral range,phase-change materials,surface plasmon polaritons,silicon carbide,nanophotonics,Ge3Sb2Te6,surface phonon polaritons,s-polarized light
更新于2025-09-19 17:13:59
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Hybrid photonic-plasmonic electro-optic modulator for optical ring network-on-chip
摘要： One of the most essential components in an optical network-on-chip (ONoC) is the electro-optic modulator. Mach-Zehnder and micro-ring resonator electro-optic modulators are widely used in ONoC, and conventional silicon-based modulators have large footprints and low modulation rates and lack thermal stability. In this paper, a new electro-optic modulator based on surface plasmon polariton (SPP) is proposed, and indium tin oxide (ITO) is utilized as a conducting transparent oxide (TCO) material in the electro-optic modulator. The modulated optical signal is suitable for ONoC with architectures such as optical ring network-on-chip (ORNoC). When the wavelength is 1550 nm, the average coupling efficiency is over 70%, the extinction ratio of the electro-optic modulator is -14.1 dB, and the insertion loss is 2.1 dB. In addition, the size of the modulator is less than 8.50 μm×1.6 μm, and the modulation operating bandwidth is up to 0.7171 Tbit/S. When the wave division multiplex (WDM) mode is used, the operating bandwidth is up to 2.1 Tbit/S, and the energy consumption per bit (E) is 5.7211 fJ/bit. All of the above results were obtained from 3D-FDTD Simulation Software and MATLAB.
关键词： electro-optic modulator,ORNoC,optical network-on-chip,transparent conductive oxide,surface plasmon polaritons
更新于2025-09-19 17:13:59
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Duplicating Plasmonic Hotspots by Matched Nanoantenna Pairs for Remote Nanogap Enhanced Spectroscopy
摘要： Plasmonic nanoantennas are capable of reversibly interconverting free-space radiation with localized modes at the nanoscale. However, optical access to a single nanoantenna, through a laser beam, is always accompanied by disruptive background perturbations and heating effects. Remote spectroscopy is one promising route to overcome these effects. Here, we demonstrate excitation-collection-separated enhanced spectroscopy using a matched nanoantenna pair. The receiving and transmitting antennas are geometrically separated, but bridged by the propagating surface plasmon polaritons (SPPs) on the metal film. The receiving antenna, consisting of a silver nanowire on mirror, ensures a high light-to-plasmon conversion efficiency. The transmitting antenna consists of a silver nanocube over mirror and is impedance matched to free space photons and the propagating SPPs. As a proof-of-principle, we demonstrate remote surface-enhanced Raman scattering with a high signal-to-noise ratio. This matched nanoantenna pair may have applications for remote entanglement of quantum emitters, biochemistry detection, or optical interconnects.
关键词： surface plasmon polaritons,directional launching,remote spectroscopy,Nanoantenna,nanoparticle over mirror
更新于2025-09-19 17:13:59
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High-performance spoof surface plasmon polariton waveguides and splitters based on Greek-cross fractal units
摘要： In this paper, we introduce the fractal geometry into the spoof surface plasmon polariton (SSPP) waveguide and splitter design. We propose a novel SSPP waveguide consisting of periodic corrugated Greek-cross fractal units (GCFUs) connected to a microstrip line. The generation process of periodic corrugated GCFUs is described and the dispersion characteristics are studied. We find we can engineer the property of the waveguide at will by tuning the parameters of the GCFU. To validate the proposed design, a wideband lowpass filter based on double-sided DCFUs with ultra-sharp roll-offs is fabricated and tested. Based on this waveguide concept, we design a wideband Y-splitter including an SSPP waveguide with double-sided GCFUs and two SSPP waveguide branches with single-sided GCFUs. To improve isolations and reduce the reflections between output ports of the Y-splitter, a 100 Ω resistor is loaded in the middle of two symmetrical branches to construct Wilkinson splitter to equally and efficiently split the energy of the SSPPs into two parts. The simulated and measured results show that the SSPP splitter possesses excellent performance in a passband of 1.5 - 4.0 GHz with low insertion loss (S21, S31 > -4 dB), high reflection loss (S11, S22, S33 < -10 dB), and high isolation (S32 < -10 dB). This work may open up a new door for the development of various plasmonic integrated functional devices.
关键词： Spoof surface plasmon polaritons,Waveguides,Wilkinson splitters,Greek-cross fractal unit
更新于2025-09-19 17:13:59
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Picosecond Laser-Induced Hierarchical Periodic Near- and Deep-Subwavelength Ripples on Stainless-Steel Surfaces
摘要： Ultrafast laser-induced periodic surface subwavelength ripples, categorized based on the ripple period into near-subwavelength ripples (NSRs) and deep-subwavelength ripples (DSRs), are increasingly found in the variety of materials such as metals, semiconductors and dielectrics. The fabrication of hierarchical periodic NSRs and DSRs on the same laser-irradiated area is still a challenge since the connection between the two remains a puzzle. Here we present an experimental study of linearly polarized picosecond laser-induced hierarchical periodic NSRs and DSRs on stainless-steel surfaces. While experiencing peak power density higher than a threshold value of 91.9 GW/cm2, in the laser-scanned area appear the hierarchical periodic NSRs and DSRs (in particular, the DSRs are vertically located in the valley of parallel NSRs). A large area of the uniformly hierarchical periodic NSRs and DSRs, with the spatial periods 356 ± 17 nm and 58 ± 15 nm, respectively, is fabricated by a set of optimized laser-scanning parameters. A qualitative explanation based on the surface plasmon polariton (SPP) modulated periodic coulomb explosion is proposed for unified interpretation of the formation mechanism of hierarchical periodic NSRs and DSRs, which includes lattice orientation of grains as a factor at low peak power density, so that the initial DSRs formed have a clear conformance with the metallic grains.
关键词： stainless steel,surface plasmon polaritons,coulomb explosion,laser induced subwavelength ripples
更新于2025-09-19 17:13:59
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Ultra-compact SSPP waveguides and notch filters based on double-sided parallel-strip lines
摘要： In this paper, we propose a new variety of strong field confinement, ultra-compact size, easy-to-integrate spoof surface plasmon polariton (SSPP) waveguides based on double-sided parallel-strip lines (DSPSL), which are formed by etching opposite spiral grooves on the upper and lower metal layers of the DSPSL. By analyzing the dispersion characteristics, we found that the opposite spiral grooves can significantly reduce the asymptotic frequency of the dispersion curve. Compared with the conventional comb-shaped SSPP structures at the same asymptotic frequency, the size of the structure is reduced to 19.85%, which facilitates miniaturization and integration of microwave devices. A broadband transition is also designed to achieve smooth impedance and momentum matching for the proposed SSPP waveguide. Owing to the dual-conductor structure, the proposed waveguides can be easily integrated with active devices and can also support low-frequency or time-domain signals without causing distortions. The proposed SSPP waveguides have strong field confinement and can concentrate the field around the spiral groove, implying great potential applications in sensing and detection. In parallel, we also designed two notch filters based on the proposed SSPP waveguide, which can achieve adjustable narrowband or broadband filtering by loading different capacitors. The proposed design can be widely used in various plasmonic devices, which opens up a new door to build up large-scale plasmonic integrated circuits in the microwave and terahertz regimes.
关键词： Spoof surface plasmon polaritons,parallel-strip lines,waveguides,notch filters
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - A Novel Power Divider Based on Hybrid Circuit of Surface Plasmon Polaritons and Substrate Integrated Waveguide
摘要： In this paper, a novel power divider based on hybrid circuit of spoof surface plasmon polaritons (SPPs) and substrate integrated waveguide (SIW) is proposed. The hybrid circuit consists of three paths including one input branch (SIW) and two identical output branches (spoof SPPs). The pass-band of the power divider is controllable by designing the geometrical parameters of spoof SPPs and SIW, which is because that spoof SPPs and SIW can adjust the upper and lower cutoff frequencies, respectively. Simulated results demonstrated the characteristics of power dividers, such as highly efficient transmission, low loss, and bandwidth adjustable. The combining of spoof SPPs and SIW provides more potential for the development of the integrated functional devices in microwave frequency.
关键词： spoof surface plasmon polaritons (SPPs),hybrid circuit,substrate integrated waveguide (SIW),power divider,microwave frequency
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Experimental Demonstration and Numerical Study of Plasmon-Soliton Waves
摘要： Merging the fields of plasmonics and nonlinear optics authorizes a variety of fascinating and original physical phenomena. In this work, we specifically study the combination of the strong light confinement ability of surface plasmon polaritons (SPP) with the beam self-trapping effect in a nonlinear optical Kerr medium. Although this idea of plasmon-soliton has been the subject of numerous theoretical papers since the eighties, up to now, no experimental evidence had been revealed yet. In the present study, a proper structure has been designed and fabricated allowing the first experimental demonstration of these hybrid nonlinear waves merging spatial solitons and SPP. To be able to trigger the nonlinearity at moderate light power and simultaneously to allow propagation over several millimeters, a multilayered dielectric-metal structure was first designed by modeling. It consists of a five-layer planar geometry made from a silicon wafer with a thick silica layer covered by a chalcogenide layer that is covered with a 10 nm silica layer followed by a gold film. Performed numerical simulations show that the main nonlinear TM modes of the designed planar waveguide exhibits a strongly enhanced Kerr self-focusing thanks to the plasmonic effect compared to the main TE nonlinear mode. The experimental analysis consists in injecting a typical 4×30 μm2 (FWHM) elliptical beam at 1.55 μm from a femtosecond laser into the 5 mm long structure. The output beam distribution evolution is then monitored versus input light intensity. The large trapping enhancement observed for a TM mode in presence of the plasmonic structure compared to configurations where the plasmonic effect is absent. For an input intensity of 1.17 GW/cm2 the beam is self-confined to a 12 μm FWHM while the FWHM is twice larger without plasmonic effect. The proposed plasmonic structure definitely exposes an enhanced self-focusing nonlinearity. The strong light confinement is due to the presence of the plasmon-soliton wave that propagates in the studied structures only for the TM polarization. Different configurations have been characterized and modeled as a function of beam input intensity that confirm the formation of these plasmon-soliton waves.
关键词： plasmon-soliton,surface plasmon polaritons,Kerr medium,plasmonics,nonlinear optics
更新于2025-09-16 10:30:52