245 research outputs found
Broadband negative refraction in stacked fishnet metamaterial
We demonstrate a scheme to utilize the stacked fishnet metamaterial for
all-angle negative refraction and subwavelength imaging within a wide frequency
range starting from zero frequency. The theoretical predictions are verified by
the finite-difference-in-time-domain (FDTD) numerical simulations. The
phenomena come from the negative evanescent coupling between the adjacent slab
waveguides through the breathing air holes perforated on metal layers.Comment: 8 pages, 4 figure
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