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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 11 — Jun. 1, 2013
  • pp: 1890–1892

Unlocked evanescent waves in periodic structures

Muriel Botey, Yu-Chieh Cheng, Vicent Romero-Garcia, Ruben Picó, Ramon Herrero, Victor Sánchez-Morcillo, and Kestutis Staliunas  »View Author Affiliations

Optics Letters, Vol. 38, Issue 11, pp. 1890-1892 (2013)

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We predict the existence of evanescent modes with unlocked phases in two-dimensional (2D) dielectric periodic structures. Contrary to what is known for one-dimensional structures, where evanescent fields lock to the host modulation, we show that in 2D systems a new class of evanescent modes exists with an unlocked real part of the wave vector. Hence, beams constructed from such unlocked evanescent waves can exhibit spatial effects. A significant focalization of a beam propagating within the band gap of a flat photonic crystal slab is also shown. The predicted phenomenon is expected to be generic for spatially modulated materials.

© 2013 Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(260.5950) Physical optics : Self-focusing
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:
Atomic and Molecular Physics

Original Manuscript: February 26, 2013
Manuscript Accepted: April 12, 2013
Published: May 23, 2013

Muriel Botey, Yu-Chieh Cheng, Vicent Romero-Garcia, Ruben Picó, Ramon Herrero, Victor Sánchez-Morcillo, and Kestutis Staliunas, "Unlocked evanescent waves in periodic structures," Opt. Lett. 38, 1890-1892 (2013)

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Fig. 1. Fig. 2. Fig. 3.

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