TITLE

Subwavelength focusing of light by a tapered microtube

AUTHOR(S)
Jian Fu; Hongtao Dong; Wei Fang
PUB. DATE
July 2010
SOURCE
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041114
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We propose a mechanism for subwavelength focusing at optical frequencies based on the use of a tapered microtube fabricated from a glass capillary tube. Using coherent illumination at 671 nm and a near-field scanning optical microscope probe which was mounted on a three-axis piezonanopositioning stage, a sequence of two-dimensional intensity profiles were obtained. Our experimental results reveal the smallest focal spot with a near diffraction-limited full width at half-maximum of ∼435 nm (0.65λ) at a distance of ∼1.47 μm (2.2λ) from the output end face of microtube. The experimental results are in agreement with our numerical simulation.
ACCESSION #
52616442

 

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