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Journal of Nanophotonics

All-angle negative refraction effects and subwavelength imaging in photonic crystals with honeycomb lattice
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Paper Abstract

Broadband, all-angle negative refraction (AANR) effects and imaging with subwavelength resolution have been analyzed in a honeycomb lattice of silicon rods in air background, as well as in the inverse structure of air holes in a silicon wafer. In the rod lattice, it was possible to obtain AANR effects for transverse-magnetic (TM) polarization in the second band (TM2) with a bandwidth as large as 23% after optimizing the ratio of feature size to the lattice constant as 0.44 and a super-lensing effect with a binary coherent source resolution of 0.68λ. On the other hand, the hole lattice shows AANR for both TM2 (bandwidth of 14%) and TE2 (bandwidth of 15.3%) bands with an additional advantage of polarization-independent AANR of 5% bandwidth. The hole lattice also shows a super-lensing behavior, which helps in imaging with a subwavelength resolution of 0.19λ for a single-point source and 0.80λ with a binary source for TM polarization while it is 0.48λ and 0.97λ, respectively, for transverse-electric (TE) polarization. The conditions for perfect imaging have been studied, and the phenomenon of dual negative refraction for both TE and TM polarization is also discussed.

Paper Details

Date Published: 20 July 2017
PDF: 12 pages
J. Nanophoton. 11(3) 036005 doi: 10.1117/1.JNP.11.036005
Published in: Journal of Nanophotonics Volume 11, Issue 3
Show Author Affiliations
Karikkuzhi Variyath Ummer, Indian Institute of Technology Kanpur (India)
Ramarao Vijaya, Indian Institute of Technology Kanpur (India)

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