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Application of circularly polarized beams in interferometric illumination ofcolloid sphere monolayers enables the direct fabrication of rectangularpatterns consisting of circular nanohole miniarrays in metal films. Thespectral and near-field effects of complex rectangular patterns made of acentral nanoring and slightly rotated satellite nanocrescents were studied inazimuthal orientations promoting the localized and propagating plasmon'scoupling. To inspect the localized modes separately, spectral responses andnear-field phenomena of hexagonal patterns composed of uniform nanorings andnanocrescents, that can be fabricated by a perpendicularly and obliquelyincident single homogeneous circularly polarized beam, were investigated. Touncover the interaction of localized and propagating modes, artificialrectangular patterns composed of a singlet nanoring, singlet horizontalnanocrescent and quadrumer of four slightly rotated nanocrescents wereanalyzed. It was demonstrated that the interacting C2 and C1 localizedresonances on the (approximately) horizontal nanocrescents in C orientation(($16^{\circ}$) $0^{\circ}$ azimuthal angle) and the azimuthal orientation(in)dependent localized resonance on the (nanorings) nanocrescents coupled withpropagating surface plasmon polaritons (close to) in U orientation(($106^{\circ}$)$90^{\circ}$ azimuthal angle) result in similar split spectra.The spectral response of the complex miniarray pattern can be precisely tunedby varying the geometrical parameters of the moderately interacting nanoholesand the pattern period. Enhancement of dipolar emitter's fluorescence isdemonstrated in appropriate configurations that have a potential application inbio-object detection.

Spectral engineering via complex patterns of circular nano-object  miniarrays: II. concave patterns tunable by integrated lithography realized  by circularly polarized light