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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 30 — Oct. 20, 2004
  • pp: 5631–5636

Coupling of light from an LED into a thin light guide by diffractive gratings

Samuli Siitonen, Pasi Laakkonen, Pasi Vahimaa, Konstantins Jefimovs, Markku Kuittinen, Marko Parikka, Kari Mönkkönen, and Ahti Orpana  »View Author Affiliations


Applied Optics, Vol. 43, Issue 30, pp. 5631-5636 (2004)
http://dx.doi.org/10.1364/AO.43.005631


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Abstract

Ring-shaped and radial diffractive gratings are designed with rigorous diffraction theory to couple light of a nearly monochromatic LED into a thin planar light guide on the bottom side. The theoretical coupling efficiencies for ring-shaped and radial gratings are 41% and 66%, respectively. Optimized diffractive elements are manufactured with direct electron-beam lithography and reactive-ion-etching into SiO2 substrates. Good agreement between experimental and theoretical results for selected radial gratings is reached. Furthermore, the mass production tests using injection molding are carried out with good replicability.

© 2004 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(230.1950) Optical devices : Diffraction gratings
(230.7400) Optical devices : Waveguides, slab

History
Original Manuscript: March 18, 2004
Revised Manuscript: July 15, 2004
Published: October 20, 2004

Citation
Samuli Siitonen, Pasi Laakkonen, Pasi Vahimaa, Konstantins Jefimovs, Markku Kuittinen, Marko Parikka, Kari Mönkkönen, and Ahti Orpana, "Coupling of light from an LED into a thin light guide by diffractive gratings," Appl. Opt. 43, 5631-5636 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-30-5631

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