What diffraction limit?
Several approaches are capable of beating the classical 'diffraction limit'. In the optical domain, not only are superlenses a promising choice: concepts such as super-oscillations could provide feasible alternatives.
Zheludev
Nikolay I
NI
Optoelectronics Research Centre, University of Southampton, Highfield, Southampton SO17 1BJ, UK. n.i.zheludev@soton.ac.uk