Spatial filtering using media with indefinite permittivity and permeability tensors

Schurig, D.; Smith, D. R.
April 2003
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2215
Academic Journal
Bilayers of media for which the permittivity and permeability tensors are indefinite—that is, not all principle elements possess the same sign—can be used to construct low-, high-, and bandpass spatial filters. These filters possess sharp adjustable roll-offs, and can operate both below and above free-space cutoff to select specific spatial variation components or beam angles from a source or image.


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