## Geometrical Mie theory for resonances in nanoparticles of any shape |

Optics Express, Vol. 19, Issue 22, pp. 21432-21444 (2011)

http://dx.doi.org/10.1364/OE.19.021432

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### Abstract

We give a geometrical theory of resonances in Maxwell’s equations that generalizes the Mie formulae for spheres to *all* scattering channels of any dielectric or metallic particle without sharp edges. We show that the electromagnetic response of a particle is given by a set of modes of internal and scattered fields that are coupled pairwise on the surface of the particle and reveal that resonances in nanoparticles and excess noise in macroscopic cavities have the same origin. We give examples of two types of optical resonances: those in which a single pair of internal and scattered modes become strongly aligned in the sense defined in this paper, and those resulting from constructive interference of many pairs of weakly aligned modes, an effect relevant for sensing. This approach calculates resonances for every significant mode of particles, demonstrating that modes can be either bright or dark depending on the incident field. Using this extra mode information we then outline how excitation can be optimized. Finally, we apply this theory to gold particles with shapes often used in experiments, demonstrating effects including a Fano-like resonance.

© 2011 OSA

**OCIS Codes**

(160.3900) Materials : Metals

(290.0290) Scattering : Scattering

(160.4236) Materials : Nanomaterials

(290.5825) Scattering : Scattering theory

**ToC Category:**

Scattering

**History**

Original Manuscript: July 20, 2011

Revised Manuscript: September 23, 2011

Manuscript Accepted: September 28, 2011

Published: October 17, 2011

**Citation**

F. Papoff and B. Hourahine, "Geometrical Mie theory for resonances in nanoparticles of any shape," Opt. Express **19**, 21432-21444 (2011)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-22-21432

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