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Giant light absorption by plasmons in a nanoporous metal film
Author(s) -
Teperik T. V.,
Popov V. V.,
García de Abajo F. J.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200460349
Subject(s) - materials science , resonance (particle physics) , void (composites) , plasma , surface plasmon resonance , plasmon , nanoporous , molecular physics , absorption (acoustics) , radiative transfer , surface plasmon , absorbance , metal , optics , condensed matter physics , atomic physics , chemistry , optoelectronics , physics , nanotechnology , composite material , nanoparticle , quantum mechanics , metallurgy
We have calculated the light absorption spectra of a metal film containing a hexagonal two‐dimensional lattice of spherical nano‐voids. It is shown that giant resonant absorption of light occurs at the plasma resonance of the void lattice in the visible when the void‐to‐surface distance and the inter‐void spacing are thinner than the skin depth. The maximum absorbance, at plasma resonance, is shown to be 50%. This phenomenon occurs when the void‐to‐surface distance has a specific value, which ensures optimal coupling of plasmons in the voids to the external light. We have found a physical criterion for the optimal coupling, which reads that the radiative broadening of the plasma resonance must be equal to its dissipative broadening in order to produce maximum light absorption at the resonance. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)