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Quasi-achromatic Fresnel zone lens with ring focus
Anand Vijayakumar,
Published in OSA - The Optical Society
2014
   
Issue: 9
Pages: 1970 - 1974
Abstract
The phase of a standard Fresnel zone lens (FZL) is periodically modulated in the radial direction using the phase of a binary fraxicon. The resulting element (rf -FZL) focuses light into a ring. The ring is found to be quasi-achromatic, in that the diameter is wavelength independent but its location is not. The binary rf -FZL is fabricated using electron beam direct writing. Experimental results confirm the generation of a wavelength-independent ring pattern at the focus of the rf-FZL. An efficiency of 24% was obtained. The variation in radius of ring pattern was reduced from 61 μm to less than 10 nm for a corresponding wavelength variation from 532 to 633 nm. © 2014 Optical Society of America.
About the journal
JournalData powered by TypesetApplied Optics
PublisherData powered by TypesetOSA - The Optical Society
ISSN1559128X
Impact Factor1.230
Open AccessNo
Citation Styleunsrt
Sherpa RoMEO Archiving PolicyGreen
Concepts (7)
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    A-RINGS
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    ELECTRON BEAM DIRECT WRITING
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    FRESNEL ZONES
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    QUASI-ACHROMATIC
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    Radial direction
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    RING PATTERNS
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    Bins