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A spectrally tunable add-drop filter based on a whispering gallery mode in a double dielectric microdisk pair with an air gap is proposed, and its operation process and performance are demonstrated by finite-difference time-domain simulation.
An incident wave source condition that specifies the field at a single grid point is problematic for the pseudospectral time-domain (PSTD) method because of the spatial Fourier transforms inherent in the algorithm. Previously, it had been suggested in the literature that a spatially smoothed source spanning several grid cells in each direction was required to avoid aliasing errors, referred to as...
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