Abstract
In this work we theoretically reveal the huge local field enhancement in a so-called perfect plasmonic absorber. We study the power absorption of light in a planar grid modelled as an effective sheet with zero optical thickness. The key prerequisite of the total absorption is the simultaneous presence of both resonant electric and magnetic modes in the structure. We show that the needed level of the magnetic mode is achievable using the effect of substrate-induced bianisotropy. On the microscopic level this bianisotropy is a factor which results in the huge local field enhancement at the same wavelength where the maximal absorption holds.
Highlights
In this Letter we theoretically study the possibility of total power absorption of light in a planar grid modelled as an effective sheet with zero optical thickness
The Total absorption (TA) has been predicted for socalled perfect plasmonic absorbers (PPA) [10,11,12]
The wave reflected from the metal substrate cancels out with that reflected from the metafilm [11, 12]
Summary
In this Letter we theoretically study the possibility of total power absorption of light in a planar grid modelled as an effective sheet with zero optical thickness. Consider an optically dense planar array of particles possessing both electric and magnetic polarizabilities and located in free space. The relationship between the electric and magnetic surface polarizations and the mean values of the electric and magnetic fields at the grid plane can be written as [13, 25]: Px = αexex < Ex >, My = αm yym < Hy > .
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