Hyper-gratings: nanophotonics in planar anisotropic metamaterials

Details Hyper-gratings: nanophotonics in planar anisotropic metamaterials Hyper-gratings: nanophotonics in planar anisotropic metamaterials

2008-09-30

arxiv.org/abs/0810.0044v1

Physics

Optics

Scientific paper

10.1364/OL.34.000890

We present a technique capable of producing subwavelength focal spots in the far-field of the source in planar non-resonant structures. The approach combines the diffraction gratings that generate the high-wavevector-number modes and planar slabs of homogeneous anisotropic metamaterials that propagate these waves and combine them at the subwavelength focal spots. In a sense, the technique combines the benefits of Fresnel lens, near-field zone plates, hyperlens, and superlens, and at the same time resolves their fundamental limitations. Several realizations of the proposed technique for visible, near-IR, and mid-IR frequencies are proposed, and their performance is analyzed theoretically and numerically. Generalization of the developed approach for sub-diffractional on-chip photonics is suggested.

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