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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 23 — Dec. 1, 2010
  • pp: 3973–3975

Role of propagating modes in a double-groove grating with a +1st-order diffraction angle larger than the substrate–air critical angle

Hideo Iizuka, Nader Engheta, Hisayoshi Fujikawa, Kazuo Sato, and Yasuhiko Takeda  »View Author Affiliations


Optics Letters, Vol. 35, Issue 23, pp. 3973-3975 (2010)
http://dx.doi.org/10.1364/OL.35.003973


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Abstract

Here we show, analytically and numerically, that in a TiO2 double-groove grating with two different groove widths per period attached on the SiO2 substrate, the normally incident light couples to the +1st-order transmission with 96.9% efficiency and with a 50° diffraction angle that is larger than the SiO2–air interface critical angle. Modal analysis reveals that three propagating modes for the +1st diffraction order reach the grating back end in phase, while the corresponding propagating modes for the −1st and zeroth orders are added destructively at the grating end. Four optical devices based on this grating characteristic are numerically demonstrated.

© 2010 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1960) Diffraction and gratings : Diffraction theory

ToC Category:
Diffraction and Gratings

History
Original Manuscript: August 19, 2010
Revised Manuscript: October 31, 2010
Manuscript Accepted: October 31, 2010
Published: November 23, 2010

Citation
Hideo Iizuka, Nader Engheta, Hisayoshi Fujikawa, Kazuo Sato, and Yasuhiko Takeda, "Role of propagating modes in a double-groove grating with a +1st-order diffraction angle larger than the substrate–air critical angle," Opt. Lett. 35, 3973-3975 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-23-3973

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