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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - Enhanced Subwavelength Coupling and Nanofocusing with Fiber-Plasmonic Hybrid Probe
摘要： Metallic nanowires supporting surface plasmon polaritons can localize optical fields at nanoscale for near-field imaging. In this paper, we propose a photonic-plasmonic probe for nanoscale light confinement. The linearly polarized fiber mode is asymmetrically coupled to radial plasmons to create hot-spot at the tip apex.
关键词： nano-antenna,surface plasmon polaritons,optical fiber,near-field microscopy,mode conversion
更新于2025-09-11 14:15:04
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DIFFRACTION FROM A GRATING ON A CHIRAL MEDIUM: APPLICATION OF ANALYTICAL REGULARIZATION METHOD
摘要： Theoretical results on the electromagnetic wave di?raction from a periodic strip grating placed on a chiral medium are obtained. Analytical Regularization Method based on the solution to the vector Riemann-Hilbert boundary value problem was used to get robust numerical results in the resonant domain, where direct solution methods typically fail. It was shown that in the case of normal incidence of linearly polarized wave the cross-polarized ?eld appears in the re?ected ?eld. For elliptically polarized incident wave the di?raction character essentially depends on the polarization direction of the incident wave. These di?raction peculiarities are more pronounced in the resonant domain. In?uence of the dichroism caused by chiral medium losses is thoroughly studied. The combination of a chiral medium and a grating can be e?ectively used for a frequency and polarization selection and for a mode conversion.
关键词： vector Riemann-Hilbert boundary value problem,chiral medium,Analytical Regularization Method,mode conversion,resonant domain,electromagnetic wave diffraction,polarization selection
更新于2025-09-11 14:15:04
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Three-mode multiplexer and demultiplexer utilizing trident and multimode couplers
摘要： In this paper, a simultaneous three-mode silicon (de)multiplexer using a trident coupler and a 3×3 multimode interference (MMI) is presented. The fundamental (TE0), first-order (TE1), and second-order (TE2) modes at the input are successfully demultiplexed and converted to three uniform fundamental modes (TE0) at the output ports. The device is designed and optimized by numerical simulation using three-dimensional beam propagation method together with effective index method. The three-mode (de)multiplexing is achieved over the whole C-band with small insertion loss (<0.9 dB) and crosstalk (<?17 dB). The proposed device also features with a small footprint (5 μm×400 μm) and a large fabrication tolerance against chip-size variations while maintaining the desired optical performance.
关键词： silicon photonics,Mode-division multiplexing,Y-junction coupler,planar lightwave circuits,mode conversion,multimode interference coupler
更新于2025-09-09 09:28:46