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We report here a compact, efficient second-order grating coupler for normally incident light. Through making use of transverse resonance and evanescent field coupling, the coupler designed, exhibits high frequency-selectiveness with controllable linewidths. Full-wave simulations based on finite-difference-time-domain method demonstrate linewidth as small as 3 nm at wavelengths 1.497 μm and 1.514 μm.
Prior theoretical studies and experience confirm that the stability of marching-on-in-time (MOT) solvers pertinent to the analysis of scattering from free-standing three-dimensional perfect electrically conducting surfaces hinges on the accurate evaluation of MOT matrix elements resulting from a Galerkin discretization of the underlying time domain integral equation (TDIE). Unfortunately, the accurate...
Theoretical studies and experience confirm that the stability of marching-on-in-time (MOT) solvers pertinent to the analysis of scattering from free-standing threedimensional perfect electrically conducting (PEC) surfaces hinges on the accurate evaluation of the MOT matrix elements resulting from a Galerkin discretization of the underlying integral equation. Unfortunately, accurate evaluation of the...
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