Abstract
We reveal the distinct wavelength dependence of not only the transmission power but also the phase change in double-layered metallic slit array systems with gradually modulated slit intervals, which are promising structures for achieving novel optical phased-array functions, through finite-difference time-domain simulations. In spite of the structural modifications, the transmittance of the non-periodic system displays waveguide mode resonance for a conventional constant-period array system. By the resonance effect, maximum phase change is achieved with sufficiently high output powers around the transmission peak wavelength, and further enhanced to values much larger than those estimated simply from the optical path.
Highlights
Metamaterials are artificially structured materials that have unit structures much smaller than the incident electromagnetic wavelengths
We are interested in a cut-through metallic slit array, which may behave as a dielectric slab for light wavelengths much longer than the slit period.[4]
These interesting phenomena were interpreted in terms of optical path control of the diffracted evanescent waves in the air gap region between the metallic plates
Summary
Metamaterials are artificially structured materials that have unit structures much smaller than the incident electromagnetic wavelengths. Remarkable transmission characteristics of optical waves through modulated doublelayered metallic slit arrays
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