Special Section on Metamaterials and Photonic Nanostructures

Uniaxial epsilon-near-zero metamaterials: from superlensing to double refraction

[+] Author Affiliations
Carlos J. Zapata-Rodríguez

University of Valencia, Department of Optics, Dr. Moliner 50, 46100 Burjassot, Spain

David Pastor

University of Valencia, Department of Optics, Dr. Moliner 50, 46100 Burjassot, Spain

Juan J. Miret

University of Alicante, Department of Optics, Pharmacology and Anatomy, P.O. Box 99, 03690 Alicante, Spain

Slobodan Vuković

University of Belgrade, Center of Microelectronic Technologies and Single Crystals, Institute of Chemistry, Technology and Metallurgy, Njegoševa 12, 11000 Belgrade, Serbia

Texas A&M University at Qatar, P.O. Box 23874, Doha 77844, Qatar

J. Nanophoton. 8(1), 083895 (Jan 20, 2014). doi:10.1117/1.JNP.8.083895
History: Received September 15, 2013; Revised December 12, 2013; Accepted December 16, 2013
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Abstract.  We investigated optical properties of nanostructured metal-dielectric multilayered lattices under the conditions of epsilon-near-zero (ENZ), a concept derived from the effective-medium approach (EMA). We theoretically found that the periodic array of metallic nanolayers may exhibit either superlensing driven by broadband canalization from point emitters or single-polarization double refraction, and conventional positive as well as negative, even at subwavelength regimes. For the latter case, we formulated a modified EMA, and subsequently a generalized refraction law, that describes both refractive behaviors concurrently. The modal coupling of plasmonic lattice resonances, and nonlocality induced by partial screening across the nanolayer length, are responsible for these distinct effects. Numerical simulations show that deep-subwavelength lensing along the optical axis of Ag-GaAs metamaterial is clearly enhanced at optical wavelengths. On the other hand, transverse-magnetic-polarized radiation that is obliquely incident on the ENZ periodic nanostructures with the same materials in the infrared (around 1.55μm) undergoes double refraction neighboring 50/50 beamsplitting.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Carlos J. Zapata-Rodríguez ; David Pastor ; Juan J. Miret and Slobodan Vuković
"Uniaxial epsilon-near-zero metamaterials: from superlensing to double refraction", J. Nanophoton. 8(1), 083895 (Jan 20, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083895


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