Photonic Crystal Based Subwavelength Imaging and Cloaking Optical Devices

Potentialities of 2.5D dielectric photonic crystals for subwavelength imaging or in- visibility cloaking operation at optical wavelengths are studied numerically and experimentally. First, a negative refraction based ∞at lens is designed, fabricated and characterized. Using scan- ning near-fleld optical microscopy, subwavelength imaging (0.8‚) for a deduced refractive index of i1 is obtained at 1.55"m. Second, an original design aimed to operate as a cloaking device is proposed by combining photonic lattices operating under difierent regimes, exploiting both pass- and stop-band properties.