Remote focusing of a light beam

The remote focusing of light in a graded-index medium via mode interference is demonstrated using exact analytical solutions of the wave equation. Strong focusing of a light beam occurs at extremely long distances and this repeats periodically with distance. The high efficiency transfer of a strongl...

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Bibliographic Details
Published in:Laser physics letters 2016-01, Vol.13 (1), p.15101
Main Author: Petrov, Nikolai I
Format: Article
Language:English
Subjects:
fiber optics
focusing
imaging
photonics
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Summary:The remote focusing of light in a graded-index medium via mode interference is demonstrated using exact analytical solutions of the wave equation. Strong focusing of a light beam occurs at extremely long distances and this repeats periodically with distance. The high efficiency transfer of a strongly focused subwavelength spot through an optical waveguide over large distances takes place with a period of revival. The simulated intensity distributions of a focused light beam and focusing efficiency (power in a central spot/total power) are presented. The far-field super-resolution imaging capabilities of a graded-index waveguide are also analyzed.
ISSN:1612-2011
1612-202X
DOI:10.1088/1612-2011/13/1/015101