We propose a broadband nano-plasmonic reflector by using an asymmetric nano-ring resonator directly connected to the
input and output waveguides based on metal-insulator-metal waveguides. Due to direct connection, both clockwise and
counterclockwise traveling modes propagate inside the ring resonator, giving rise to resonator resonances and Mach
Zehnder interference. Ultra-broad bandwidth is realized by adjusting the lengths of the ring to manipulate the resonant
wavelengths and varying its widths to minimize the low-transmission ripples. An example of the plasmonic reflector
with the dimensions of 200×522 nm×nm and the bandwidth of 1000 nm is numerically accomplished.
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