11 February 2010 Deep-subwavelength focusing and steering of light in an aperiodic metallic waveguide array
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Abstract
We consider an aperiodic array of coupled metallic waveguides with varying subwavelength widths. For an incident plane wave, we numerically demonstrate that a focus of as small as one hundredth of a wavelength can be achieved for a focal distance that is much longer than the wavelength. Moreover, the focusing behavior can be controlled by changing either the incident wavelength, or the angle of incidence, thus providing the capability of nanoscale beam steering. We show that the behavior of such subwavelength focusing can be understood using Hamiltonian optics.
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Lieven Verslegers, Peter B. Catrysse, Zongfu Yu, Shanhui Fan, "Deep-subwavelength focusing and steering of light in an aperiodic metallic waveguide array", Proc. SPIE 7604, Integrated Optics: Devices, Materials, and Technologies XIV, 76040O (11 February 2010); doi: 10.1117/12.842692; https://doi.org/10.1117/12.842692
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