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Modal characteristics of refractive index engineered hybrid plasmonic waveguide
摘要： In this work, we proposed a novel design of a refractive index engineered subwavelength grating silicon-based hybrid plasmonic waveguide via the finite element method. The intensity integral (Γ) in the upper cladding can be controlled by varying the thickness (HSi) of the top silicon layer. The highest evanescent field ratio of 0.85 is obtained at HSi=200 nm which allows the hybrid mode to confine in the low index medium and a large evanescent field resides in the upper cladding. The sensitivity of the waveguide is calculated by monitoring the change in the effective refractive index to the ambient refractive index. The maximum mode sensitivity of 0.7 is obtained. The spectral performance of the subwavelength grating (SWG) hybrid plasmonic waveguide (HPWG) based ring resonator design is studied which exhibits a sensitivity as high as 1000 nm/RIU which is higher than the previously reported values. We believe that the proposed waveguide scheme is an ideal candidate to produce highly sensitive lab-on-chip sensors.
关键词： microring resonator,refractive index sensor,Subwavelength grating hybrid plasmonic waveguide,Evanescent field ratio
更新于2025-09-23 15:21:01
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Hybrid plasmonic waveguide coupling of photons from a single molecule
摘要： We demonstrate the emission of photons from a single molecule into a hybrid gap plasmon waveguide. Crystals of anthracene, doped with dibenzoterrylene (DBT), are grown on top of the waveguides. We investigate a single DBT molecule coupled to the plasmonic region of one of the guides and determine its in-plane orientation, excited state lifetime, and saturation intensity. The molecule emits light into the guide, which is remotely out-coupled by a grating. The second-order autocorrelation and cross-correlation functions show that the emitter is a single molecule and that the light emerging from the grating comes from that molecule. The coupling efficiency is found to be βWG = 11.6(1.5)%. This type of structure is promising for building new functionality into quantum-photonic circuits, where localized regions of strong emitter-guide coupling can be interconnected by low-loss dielectric guides.
关键词： single molecule,photon emission,hybrid plasmonic waveguide,quantum-photonic circuits
更新于2025-09-19 17:13:59
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Tuning SPP propagation length of hybrid plasmonic waveguide by manipulating evanescent field
摘要： Exploring hybrid plasmonic waveguide is a major breakthrough for achieving low-loss lightwave propagation at subwavelength size. Various types of passive hybrid plasmonic waveguides have been reported, but research on active hybrid plasmonic waveguides is very limited. In this study, we propose a tunable hybrid plasmonic waveguide in which its modal characteristics could be dynamically tuned by manipulating the evanescent field of a dielectric waveguide using a closely suspended tuning waveguide. The device can obtain a long-distance lightwave propagation at centimeter scale while maintaining the propagation mode at deep-subwavelength size (2.44??2/105). Using the proposed tuning method, the propagation length can be tuned more than 100% at the same propagation mode area. The proposed device with a propagation length that can be tuned in a wide range is a promising candidate for building active photonic components.
关键词： Tunable hybrid plasmonic waveguide,Long-distance lightwave propagation,Deep-subwavelength mode size,Evanescent field manipulation
更新于2025-09-16 10:30:52
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High gain and wideband on-chip hybrid plasmonic V-shaped nano-antenna
摘要： In this paper, a wideband hybrid plasmonic V-shaped nano-antenna is proposed based on coupled hybrid plasmonic waveguide (CHPW) feeding to increase the surface plasmons propagation length. The CHPW specifications are investigated analytically and numerically to obtain the dispersion relation and propagation length by the genetic algorithm and finite element method, respectively. Moreover, the proposed V-shaped nano-antenna with the fractional bandwidth of ～86% and the maximum ef?ciency of 98% is able to receive/transmit optical signals at three telecommunication wavelengths of 850, 1310, and 1550 nm with the high realized gains of 10.5, 9.39, 9.05 dB, respectively. The shape of the radiation pattern, with a main lobe along the antenna axis, makes this antenna appropriate for point-to-point connections in inter- or intra-chip optical wireless links and networks, which is studied comprehensively in this paper. Furthermore, to obtain a high optical power signal and tune the antenna orientation, the performance of the antenna is investigated with two different types of array structure, single row and square and its applications for energy harvesting and beam steering are studied. The fabrication feasibility of the nano-antenna is realizable based on the complementary metal-oxide-semiconductor technology.
关键词： Energy harvesting,Optical nano-antenna,Wireless interconnection link,Coupled hybrid plasmonic waveguide
更新于2025-09-16 10:30:52
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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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Edge-plasmon assisted electro-optical modulator
摘要： An efficient electro-optical modulation has been demonstrated here by using an edge-plasmon mode specific for the hybrid plasmonic waveguide. Our approach addresses a major obstacle of the integrated microwave photonics caused by the polarization constraints of both active and passive components. In addition to subwavelength confinement, typical for surface plasmon polaritons, the edge-plasmon modes enable exact matching of the polarization requirements for silicon based input/output grating couplers, waveguides, and electro-optical modulators. A concept of the hybrid waveguide, implemented in a sandwichlike structure, implies a coupling of propagating plasmon modes with a waveguide mode. The vertically arranged sandwich includes a thin layer of epsilon-near-zero material (indium tin oxide) providing an efficient modulation at small length scales. Employed edge plasmons possess a mixed polarization state and can be excited with horizontally polarized waveguide modes. It allows the resulting modulator to work directly with efficient grating couplers and avoid using bulky and lossy polarization converters. A 3D optical model based on Maxwell equations combined with drift-diffusion semiconductor equations is developed. Numerically heavy computations involving the optimization of materials and geometry have been performed. Effective modes, stationary state field distribution, an extinction coefficient, optical losses, and charge transport properties are computed and analyzed. In addition to the polarization matching, the advantages of the proposed model include the compact planar geometry of the silicon waveguide, reduced active electric resistance R and a relatively simple design, attractive for experimental realization.
关键词： polarization constraints,hybrid plasmonic waveguide,drift-diffusion semiconductor equations,electro-optical modulation,edge-plasmon mode,indium tin oxide,epsilon-near-zero material,Maxwell equations
更新于2025-09-11 14:15:04