Abstract
The authors demonstrate a mechanism for focusing at optical frequencies based on the use of nanohole quasiperiodic arrays in metal screens. Using coherent illumination at 660nm and scanning aperture optical microscopy, ∼290nm “hot spots” were observed at a distance of ∼12.5μm from the array. Even smaller hot spots of about ∼200nm in waist were observed closer to the plane of the array.
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