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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 24 — Nov. 21, 2011
  • pp: 24411–24423

Design and fabrication of a metamaterial gradient index diffraction grating at infrared wavelengths

Yu-Ju Tsai, Stéphane Larouche, Talmage Tyler, Guy Lipworth, Nan M. Jokerst, and David R. Smith  »View Author Affiliations


Optics Express, Vol. 19, Issue 24, pp. 24411-24423 (2011)
http://dx.doi.org/10.1364/OE.19.024411


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Abstract

We demonstrate the design, fabrication and characterization of an artificially structured, gradient index metamaterial with a linear index variation of Δn ∼ 3.0. The linear gradient profile is repeated periodically to form the equivalent of a blazed grating, with the gradient occurring across a spatial distance of 61μm. The grating, which operates at a wavelength of 10.6μm, is composed of non-resonant, progressively modified “I-beam” metamaterial elements and approximates a linear phase shift gradient using 61 distinguishable phase levels. The grating structure consists of four layers of lithographically patterned metallic I-beam elements separated by dielectric layers of SiO2. The index gradient is confirmed by comparing the measured magnitudes of the −1, 0 and +1 diffracted orders to those obtained from full wave simulations incorporating all material properties of the metals and dielectrics of the structures. The large index gradient has the potential to enable compact infrared diffractive and gradient index optics, as well as more exotic transformation optical media.

© 2011 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(110.2760) Imaging systems : Gradient-index lenses
(160.3918) Materials : Metamaterials

ToC Category:
Metamaterials

History
Original Manuscript: September 27, 2011
Revised Manuscript: November 2, 2011
Manuscript Accepted: November 3, 2011
Published: November 14, 2011

Citation
Yu-Ju Tsai, Stéphane Larouche, Talmage Tyler, Guy Lipworth, Nan M. Jokerst, and David R. Smith, "Design and fabrication of a metamaterial gradient index diffraction grating at infrared wavelengths," Opt. Express 19, 24411-24423 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-24-24411


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