We demonstrate the steering of coherent mid-infrared radiation through plasmonic structures consisting of a
single sub-wavelength slit flanked by a periodic array of grooves, fabricated on GaAs substrates. We demonstrate
control of steering angle by tuning the incident radiation, and study beam quality for the transmitted light. In
addition, we demonstrate that small shifts in the refractive index of the GaAs substrate can actively control the
steering angle of the transmitted light, opening a path towards the development of no-moving-parts plasmonic
beam steering devices.
We present a technique for subwavelength far-field focusing of light in planar non-resonant structures. The approach
combines the diffraction gratings that generate high-wavevector waves and planar slabs of homogeneous anisotropic
metamaterials that propagate these waves and combine them at the subwavelength focal spots. The technique has all the
benefits of Fresnel lens, near-field zone plate, hyperlens, and superlens, and at the same time resolves their fundamental
limitations. Several realizations of hypergratings for visible, near-IR, and mid-IR frequencies are proposed, and their
performance is analyzed. Generalization of the developed approach for sub-diffractional imaging and on-chip photonics
is suggested.
Conference Committee Involvement (1)
International Conference on Photonics Solutions 2015
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