Superfocusing by nanoshells.
Recently researchers demonstrated, both theoretically and in the microwave range experimentally, subwavelength focusing of evanescent waves by patterned plates. The present Letter extends these ideas and the design procedure to scatterers of arbitrary shapes and to the optical range of wavelengths. The analytical study is supported by numerical results. The most intriguing feature of the proposed design is that, in the framework of classical electrodynamics of continuous media, focusing can in principle be arbitrarily sharp, subject to the constraints of fabrication.
Tsukerman
Igor
I
Department of Electrical and Computer Engineering, The University of Akron, Akron, OH 44325-3904, USA. igor@uakron.edu