Subwavelength focusing and imaging by a multimode optical waveguide.
A simple subwavelength focusing system formed by a straight or bent multimode waveguide is investigated numerically. The simulation results indicate that an appropriately designed multimode waveguide can focus the outgoing waves of a point source and form an image with a full width at half-maximum of less than half a wavelength in the near-field area at the other side of the waveguide. The physical mechanism of the subwavelength focusing for this imaging system is explained.
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Xianyu
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Center for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Joint Research Center of Photonics of the Royal Institute of Technology (KTH), Sweden.
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Sailing
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