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Imaging with subwavelength resolution by a generalized superlens at infrared wavelengths

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Abstract

We demonstrate experimentally negative refraction by a photonic crystal prism and imaging of a point source by a photonic crystal slab at 1.5μm wavelength. The photonic crystal structures were nanofabricated in a InGaAsPInP heterostructure platform, and optical characterization was performed using a near-field scanning optical microscope. By designing a suitable lens surface termination, an image spot size of 0.12λ2 was achieved, demonstrating superlens imaging with subwavelength resolution well below Abbe’s diffraction limit (0.5λ2).

© 2009 Optical Society of America

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