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Observed Retardation Effects on the Energy of the ω + ‐Surface Plasmons in Thin Aluminium Foils
Author(s) -
Swan J. B.,
Otto A.,
Fellenzer H.
Publication year - 1967
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19670230115
Subject(s) - surface plasmon , aluminium , plasmon , scattering , materials science , dispersion (optics) , phase (matter) , surface (topology) , condensed matter physics , surface plasmon polariton , phase velocity , dispersion relation , optics , molecular physics , physics , optoelectronics , metallurgy , geometry , mathematics , quantum mechanics
Characteristic energy‐loss measurements using thin aluminium foils are reported, which show a decrease in the energy hω of both types of surface plasmons in the forward scattering direction. The observed decrease in the energy of the ω + ‐branch supports the dispersion theory of surface plasmons, which predicts that the phase velocity ω/ k of both surface plasmon modes is less than c when retardation is taken into account.