Open AccessEffects of spherical mode coupling on near-field focusing by clusters of dielectric microspheres
Author(s) -
Alexander Pikulin,
Andrey Afanasiev,
N. Agareva,
A. Alexandrov,
V. I. Bredikhin,
N. Bityurin
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.009052
Subject(s) - spheres , dielectric , optics , mie scattering , superposition principle , materials science , laser , coupling (piping) , electromagnetic field , particle (ecology) , microsphere , near and far field , lens (geology) , field (mathematics) , physics , scattering , light scattering , optoelectronics , composite material , oceanography , mathematics , engineering , quantum mechanics , astronomy , chemical engineering , pure mathematics , geology
Colloidal particle lens array (CPLA) proved to be an efficient near-field focusing device for laser nanoprocessing of materials. Within CPLA, spherical particles do not act as independent microlenses. Due to the coupling of the spherical modes, the field near the clusters of spherical microparticles cannot be calculated by means of the superposition of Mie solutions for individual spheres. In the paper, the electromagnetic field distributions near laser-irradiated clusters of dielectric microspheres with configurations that match the fragments of the close-packed CPLA are studied. It is shown that some practically important mode coupling effects can be understood in terms of an effective immersion medium formed for the spherical particle by its surrounding.