Journal
OPTICS LETTERS
Volume 33, Issue 20, Pages 2398-2400Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.002398
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Metals structured by nanocavities have recently been demonstrated to efficiently absorb light in a wide range of angles of incidence. It has been assumed that nanovoid plasmons are at the origin of the strong absorption. It is shown that it is possible to totally absorb incident light without plasmons. To avoid their excitation, a diffraction grating consisting of cylindrical cavities in a metallic substrate is illuminated in transverse electric polarization. It is found that cylindrical cavities can sustain cavity resonances with a high enhancement of the light intensity, provoking a total absorption of light in a wide range of incidence. (C) 2008 Optical Society of America
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