Focusing of Light by a Nano-Hole Array

Details Focusing of Light by a Nano-Hole Array Focusing of Light by a Nano-Hole Array

2006-11-06

arxiv.org/abs/physics/0611056v1

Physics

Optics

Scientific paper

We demonstrate a conceptually new mechanism for sub-wavelength focusing at optical frequencies based upon the use of nano-hole quasi-periodic arrays in metal screens. Using coherent illumination at 660 nm and scanning near-field optical microscopy, ~290 nm "hot spots", were observed at a distance of ~12.5 mkm from the array. Even smaller hot-spots of about 200 nm in waist were observed closer to the plane of the array.

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