Header menu link for other important links
X
Composite axilens-axicon diffractive optical elements for generation of ring patterns with high focal depth
Raghu Dharmavarapu, Anand Vijayakumar,
Published in SPIE
2016
Volume: 9753
   
Abstract
A binary Fresnel Zone Axilens (FZA) is designed for the infinite conjugate mode and the phase profile of a refractive axicon is combined with it to generate a composite Diffractive Optical Element (DOE). The FZA designed for two focal lengths generates a line focus along the propagation direction extending between the two focal planes. The ring pattern generated by the axicon is focused through this distance and the radius of the ring depends on the propagation distance. Hence, the radius of the focused ring pattern can be tuned, during the design process, within the two focal planes. The integration of the two functions was carried out by shifting the location of zones of FZA with respect to the phase profile of the refractive axicon resulting in a binary composite DOE. The FZAs and axicons were designed for different focal depth values and base angles respectively, in order to achieve different ring radii within the focal depth of each element. The elements were simulated using scalar diffraction formula and their focusing characteristics were analyzed. The DOEs were fabricated using electron beam direct writing and evaluated using a fiber coupled diode laser. The tunable ring patterns generated by the DOEs have prospective applications in microdrilling as well as microfabrication of circular diffractive and refractive optical elements. © 2016 SPIE.
About the journal
JournalData powered by TypesetProceedings of SPIE - The International Society for Optical Engineering
PublisherData powered by TypesetSPIE
ISSN0277786X
Open AccessNo
Concepts (15)
  •  related image
    Bins
  •  related image
    Density (optical)
  •  related image
    Electron beam lithography
  •  related image
    Electron beams
  •  related image
    Focusing
  •  related image
    Optical interconnects
  •  related image
    BEAM-SHAPING
  •  related image
    ELECTRON BEAM DIRECT WRITING
  •  related image
    FIBER-COUPLED DIODE LASERS
  •  related image
    PROPAGATION DIRECTION
  •  related image
    PROPAGATION DISTANCES
  •  related image
    PROSPECTIVE APPLICATIONS
  •  related image
    RING PATTERNS
  •  related image
    SCALAR DIFFRACTION
  •  related image
    Diffractive optical elements