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16 - Theoretical methods in nano-optics

Published online by Cambridge University Press:  05 November 2012

Lukas Novotny  and
Bert Hecht
Lukas Novotny
Affiliation:
University of Rochester, New York and ETH Zürich, Switzerland
Bert Hecht
Affiliation:
Julius-Maximilians-Universität Würzburg, Germany
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Summary

A key problem in nano-optics is the determination of electromagnetic field distributions near nanoscale structures and the associated radiation properties. A solid theoretical understanding of field distributions holds promise for new, optimized designs of near-field optical devices, in particular by exploitation of field-enhancement effects and favorable detection schemes. Calculations of field distributions are also necessary for imagereconstruction purposes. Fields near nanoscale structures often have to be reconstructed from experimentally accessible far-field data. However, most commonly the inverse scattering problem cannot be solved in a unique way, and calculations of field distributions are needed in order to provide prior knowledge about source and scattering objects and to restrict the set of possible solutions.

Analytical solutions of Maxwell's equations provide a good theoretical understanding, but can be obtained for simple problems only. Other problems have to be strongly simpli-fied. A pure numerical analysis allows us to handle complex problems by discretization of space and time but computational requirements (usually given by CPU time and memory) limit the size of the problem and the accuracy of results is often unknown. The advantage of pure numerical methods, such as the finite-difference time-domain (FDTD) method and the finite-element (FE) method, is the ease of implementation. We do not review these pure numerical techniques since they are well documented in the literature. Instead we review two commonly used semi-analytical methods in nano-optics: themultiple-multipole method (MMP) and the volume-integral method.

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Principles of Nano-Optics , pp. 500 - 522
Publisher: Cambridge University Press
Print publication year: 2012

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