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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 18 — Jun. 20, 2002
  • pp: 3558–3566

Diffractive optical isolator made of high-efficiency dielectric gratings only

Tilman Glaser, Siegmund Schröter, Hartmut Bartelt, Hans-Jörg Fuchs, and Ernst-Bernhard Kley  »View Author Affiliations


Applied Optics, Vol. 41, Issue 18, pp. 3558-3566 (2002)
http://dx.doi.org/10.1364/AO.41.003558


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Abstract

The working principle of an optical isolator made of two corrugated dielectric gratings is introduced. One grating acts as a polarizer, and the other acts as a quarter-wave plate used in conical incidence converting linearly polarized light into circularly polarized light. Global maxima of diffraction efficiency for surface-corrugated gratings with binary, sinusoidal, and pyramidal ridge shapes with dependence on the material index are identified. Regarding technological feasibility for use in the visible wavelength range, high-frequency gratings with a binary shape were realized. With these gratings, an extinction ratio of more than 40 dB for the polarizer is theoretically possible, and more than 20 dB was experimentally achieved. A good correlation between theoretically calculated efficiencies and birefringences based on rigorous methods and the experimental results is demonstrated.

© 2002 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1950) Diffraction and gratings : Diffraction gratings
(230.1360) Optical devices : Beam splitters
(260.1440) Physical optics : Birefringence
(260.5430) Physical optics : Polarization

History
Original Manuscript: September 18, 2001
Revised Manuscript: February 7, 2002
Published: June 20, 2002

Citation
Tilman Glaser, Siegmund Schröter, Hartmut Bartelt, Hans-Jörg Fuchs, and Ernst-Bernhard Kley, "Diffractive optical isolator made of high-efficiency dielectric gratings only," Appl. Opt. 41, 3558-3566 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-18-3558

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