Abstract
In contrast to conventional emphasis on plasmonic effects, similar transmission properties between a plasmonic and nonplasmonic two-dimensional (2D) single slit are demonstrated in a series of two papers. In the first paper a special case of resonant transmissions and the underlying physics of the similarities are explored. Extension to nonresonant transmission and the general transformation are discussed in the second paper. At resonant transmission, plasmonic and nonplasmonic single slits exhibit a similar near-field mode at their corresponding resonant wavelengths. Their resonant transmission wavelengths can be transformed via a simple mapping with surface plasmon dispersion relation. A revisit of the Babinet’s principle implies that localized surface plasmon resonances play no role in the enhanced transmission of a 2D single slit. Fabry–Perot resonance, funneling at slit end faces, and waveguide dispersion dominate the resonant transmission properties.
© 2014 Optical Society of America
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