Optical absorption by a small sphere above a substrate with inclusion of nonlocal effects
- 15 May 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (19) , 11209-11215
- https://doi.org/10.1103/physrevb.45.11209
Abstract
A method for the calculation of the optical absorption by a small sphere, which has a nonlocal dielectric function and is located above a substrate, is developed. Numerical calculations of absorption spectra are performed for a metallic and a dielectric sphere above a dielectric or metallic substrate. From comparisons with the corresponding spectra of free spheres, it is found that the presence of the substrate causes a redshift of the main absorption resonance and the appearance of subsidiary absorption peaks.Keywords
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