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Electromagnetic energy in multilayered spherical particles

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Abstract

We obtain exact analytic expressions for (i) the electromagnetic energy radial density within and outside a multilayered sphere and (ii) the total electromagnetic energy stored within its core and each of its shells. Explicit expressions for the special cases of lossless core and shell are also provided. The general solution is based on the compact recursive transfer-matrix method, and its validity includes also magnetic media. The theory is illustrated on examples of electric field enhancement within various metallo–dielectric silica–gold multilayered spheres. The user-friendly MATLAB code, which includes the theoretical treatment, is available as a supplement to the paper.

© 2019 Optical Society of America

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Supplementary Material (1)

NameDescription
Code 1       MATLAB code with the theoretical treatment reported in the manuscript.

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Equations (69)

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