20 July 2017 All-angle negative refraction effects and subwavelength imaging in photonic crystals with honeycomb lattice
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Karikkuzhi Variyath Ummer, Ramarao Vijaya, "All-angle negative refraction effects and subwavelength imaging in photonic crystals with honeycomb lattice," Journal of Nanophotonics 11(3), 036005 (20 July 2017). https://doi.org/10.1117/1.JNP.11.036005 . Submission: Received: 5 December 2016; Accepted: 28 June 2017
Received: 5 December 2016; Accepted: 28 June 2017; Published: 20 July 2017
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