The electric field properties (distribution and enhancement) of high impedance surfaces under radiation are studied. It is shown that the electric field enhancement at the gap between metal plates has a linear relation with a geometrical factor and is independent of the resonator quality factor. Conditions under which the metasurface can act as an efficient optical absorber are also studied. At the end, wavelengths around 800 nm are suggested for silver (plasmonic) resonators at optical frequencies to maximize the electric field enhancement.
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Li et al. (2017) studied this question.
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