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Negative Refractive Lens (NRL) has shown that an optical system can produceimages with details below the classic Abbe diffraction limit. This opticalsystem transmits the electric field, emitted by the object surface, towards theimage surface producing the same field distribution in both surfaces. Inparticular, a Dirac delta electric field in the object surface is focusedwithout diffraction limit to the Dirac delta electric field in the imagesurface. The Maxwell Fish Eye lens (MFE) and the Spherical Geodesic Waveguide(SGW) have been claimed to break the diffraction limit using positiverefraction with a different meaning. In these cases, it has been considered thepower transmission from a point source to a point receptor, which fallsdrastically when the receptor is displaced from the focus by a distance muchsmaller than the wavelength. Although these systems can detect displacements upto Wavelength/500, they cannot be compared to the NRL, since the concept of theobject and image surface is not established. Here, it is presented an analysisof the SGW with defined object and image surfaces. The results show that aDirac delta electric field on the object surface produces an image below therefraction limits on the image surface.

Negative refractive perfect lens vs Spherical geodesic lens. Perfect Imaging comparative analysis