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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 33 — Nov. 20, 2012
  • pp: 7920–7933

Design of highly efficient transmission gratings with deep etched triangular grooves

Xufeng Jing, Junchao Zhang, Shangzhong Jin, Pei Liang, and Ying Tian  »View Author Affiliations


Applied Optics, Vol. 51, Issue 33, pp. 7920-7933 (2012)
http://dx.doi.org/10.1364/AO.51.007920


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Abstract

The design of highly efficient fused silica transmission gratings with deep-etched triangular-shaped grooves in the 1st order diffraction is realized by the rigorous coupled wave analysis (RCWA). The antireflective effect of a subwavelength triangular-groove grating with gradient effective refractive index results in the higher diffraction efficiency (>99.9%). The performance of the presented gratings is clearly better than traditional rectangular and blazed ones. The gratings are designed under Littrow mounting at a wavelength of 1064 nm to be used in high-power laser systems. A detailed fabrication tolerance, covering not only the errors in height but also the errors in the lateral dimension, is demonstrated. The physical process of the diffraction characteristics for such a triangular-groove grating can be well explained by the simplified modal method based on two-beam interference of the first two propagating modes excited by the incident wave. Based on the fact that the transmittance derived from the modal method is in good agreement with that calculated by the RCWA, the simplified modal method can be effectively utilized as an easily designed tool of the triangular-shaped gratings.

© 2012 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: August 16, 2012
Revised Manuscript: October 11, 2012
Manuscript Accepted: October 12, 2012
Published: November 14, 2012

Citation
Xufeng Jing, Junchao Zhang, Shangzhong Jin, Pei Liang, and Ying Tian, "Design of highly efficient transmission gratings with deep etched triangular grooves," Appl. Opt. 51, 7920-7933 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-33-7920

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