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Resolution of subwavelength-spaced scatterers by superdirective data processing simulating evanescent wave illumination

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3 Author(s)
R. N. Strickland ; University of Sheffield, Department of Electronic & Electrical Engineering, Sheffield, UK ; A. P. Anderson ; J. C. Bennett

Information concerning the subwavelength structure of an object is normally irretrievable from its radiated spatial-frequency distribution: consequently such fine detail is classically irresolvable. It is shown that supcrdirectivc data processing may be used to extrapolate beyond the visible spatial-frequency range so that the individual wires in an array of three 0-6 ¿¿-spaced wire scatterers are resolved. A new development of this technique, based on synthetic evanescent-wave illumination, aids recovery of extrapolated spatial frequencies which subsequently provide even greater resolution.

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Microwaves, Optics and Acoustics, IEE Journal on  (Volume:3 ,  Issue: 2 )