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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 25, Iss. 5 — May. 1, 2008
  • pp: 1075–1083

Beam splitting of low-contrast binary gratings under second Bragg angle incidence

Jiangjun Zheng, Changhe Zhou, Bo Wang, and Jijun Feng  »View Author Affiliations

JOSA A, Vol. 25, Issue 5, pp. 1075-1083 (2008)

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Beam splitting of low-contrast rectangular gratings under second Bragg angle incidence is studied. The grating period is between λ and 2 λ . The diffraction behaviors of the three transmitted propagating orders are illustrated by analyzing the first three propagating grating modes. From a simplified modal approach, the design conditions of gratings as a high-efficiency element with most of its energy concentrated in the 2 nd transmitted order ( 90 % ) and of gratings as a 1 × 2 beam splitter with a total efficiency over 90% are derived. The grating parameters for achieving exactly the splitting pattern by use of rigorous coupled-wave analysis verified the design method. A 1 × 3 beam splitter is also demonstrated. Moreover, the polarization-dependent diffraction behaviors are investigated, which suggest the possibility of designing polarization-selective elements under such a configuration. The proposed concept of using the second Bragg angle should be helpful for developing new grating-based devices.

© 2008 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1960) Diffraction and gratings : Diffraction theory
(230.1360) Optical devices : Beam splitters
(230.5440) Optical devices : Polarization-selective devices

ToC Category:
Diffraction and Gratings

Original Manuscript: January 8, 2008
Revised Manuscript: March 2, 2008
Manuscript Accepted: March 7, 2008
Published: April 18, 2008

Jiangjun Zheng, Changhe Zhou, Bo Wang, and Jijun Feng, "Beam splitting of low-contrast binary gratings under second Bragg angle incidence," J. Opt. Soc. Am. A 25, 1075-1083 (2008)

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