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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 9156–9166

Terahertz epsilon-near-zero graded-index lens

Víctor Torres, Víctor Pacheco-Peña, Pablo Rodríguez-Ulibarri, Miguel Navarro-Cía, Miguel Beruete, Mario Sorolla, and Nader Engheta  »View Author Affiliations


Optics Express, Vol. 21, Issue 7, pp. 9156-9166 (2013)
http://dx.doi.org/10.1364/OE.21.009156


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Abstract

An epsilon-near-zero graded-index converging lens with planar faces is proposed and analyzed. Each perfectly-electric conducting (PEC) waveguide comprising the lens operates slightly above its cut-off frequency and has the same length but different cross-sectional dimensions. This allows controlling individually the propagation constant and the normalized characteristic impedance of each waveguide for the desired phase front at the lens output while Fresnel reflection losses are minimized. A complete theoretical analysis based on the waveguide theory and Fermat’s principle is provided. This is complemented with numerical simulation results of two-dimensional and three-dimensional lenses, made of PEC and aluminum, respectively, and working in the terahertz regime, which show good agreement with the analytical work.

© 2013 OSA

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(080.3630) Geometric optics : Lenses
(160.1245) Materials : Artificially engineered materials
(160.3918) Materials : Metamaterials

ToC Category:
Metamaterials

History
Original Manuscript: January 22, 2013
Revised Manuscript: March 7, 2013
Manuscript Accepted: March 7, 2013
Published: April 5, 2013

Citation
Víctor Torres, Víctor Pacheco-Peña, Pablo Rodríguez-Ulibarri, Miguel Navarro-Cía, Miguel Beruete, Mario Sorolla, and Nader Engheta, "Terahertz epsilon-near-zero graded-index lens," Opt. Express 21, 9156-9166 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-7-9156


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