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A MEMS-based tunable optical nanoantenna is described. The optical performance of the tunable antenna has been investigated using rigorous finite difference time domain (FDTD) method. It reveals that peak wavelengths and local field enhancements are largely affected by the size and shape of the bowtie antenna. The optical field can be drastically enhanced by reducing the gap size less than 30 nm which...
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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