Imaging with subwavelength resolution by a generalized superlens at infrared wavelengths

We demonstrate experimentally negative refraction by a photonic crystal prism and imaging of a point source by a photonic crystal slab at 1.5 mu m wavelength. The photonic crystal structures were nanofabricated in a InGaAsP/InP 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 0.12 lambda(2) was achieved, demonstrating superlens imaging with subwavelength resolution well below Abbe's diffraction limit (0.5 lambda(2)). (C) 2009 Optical Society of America