794 research outputs found
Bloch states in light transport through a perforated metal
Light transport in a metal with two-dimensional hole arrays is considered.
Analytical expression for a transmission coefficient in periodic, isolated and
disordered cases are derived, assuming the existence of waveguide modes
transverse tunneling in two-dimensional plane perpendicular to traveling
direction of light. The one dimensional case of periodic holes, due to its
simplicity, is investigated in detail. In the dilute metal regime, when metal
fraction is small, our numerical study of the transmission coefficient of
central diffracted wave indicates the existence of a minimum which is
completely independent of an incident wavelength. Further increasing of metal
fraction leads to the unusual monotonic increasing of central diffracted wave
transmission. The role of the surface plasmons is discussed.Comment: 14pages, 2figure
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