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oe1(光电查) - 科学论文

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  • Direct Imaging of Isofrequency Contours of Guided Modes in Extremely Anisotropic All-Dielectric Metasurface

    摘要： In this work, we investigate an all-dielectric metasurface based on the silicon on insulator platform for manipulating of guided modes in the visible and near-infrared spectral ranges. We use the Fourier modal method to demonstrate numerically, that guided modes excited in the metasurface support both hyperbolic-like and elliptic dispersion regimes. We implement a back focal plane microscope combined with a high refractive index solid immersion lens to directly image the isofrequency contours of the guided modes (surface waves). Reconstruction of dispersion unambiguously reveals the transition between different dispersion regimes.

    关键词： Fourier microscopy,All-dielectric metasurface,isofrequency contours,Fourier modal method,dispersion reconstruction,surface waves

    更新于2025-09-23 15:23:52

  • [IEEE 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON) - Lviv, Ukraine (2019.7.2-2019.7.6)] 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON) - A Comparative Study of Modal Methods for Photonic and Plasmonic Structures

    摘要： We compare the performance in term of accuracy and convergence of numerical modal methods as applied to photonic and plasmonic structures. Both pure spectral problems and diffraction problems are investigated. The main challenge of any numerical modal method is to handle at best the interface conditions at the boundary of the different materials that constitute the structure and also radiation conditions in the case of isolated structures. That is the reason why we distinguish two kinds of modal methods according to whether they use full-domain or sub-domain basis expansion. In the ?rst set we will consider the Fourier Modal Method, the B-spline modal methods, and in the second one Pseudo-Spectral modal methods and Polynomial modal methods.

    关键词： Pseudo-Spectral Modal Method,Adaptive Spatial Resolution,B-Spline Modal Method,Fourier Modal Method,Polynomial Modal Method,Modal Methods

    更新于2025-09-12 10:27:22