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Evanescent modes stored in cavity resonators with backward‐wave slabs
Author(s) -
Tretyakov S. A.,
Maslovski S. I.,
Nefedov I. S.,
Kärkkäinen M. K.
Publication year - 2003
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.11001
Subject(s) - resonator , evanescent wave , microwave , finite difference time domain method , physics , optics , boundary value problem , electromagnetic field , wavelength , microwave cavity , plane wave , acoustics , quantum mechanics
As shown by N. Engheta, electromagnetic fields in two adjacent slabs bounded by two metal walls can satisfy the boundary conditions, even if the distance between the two walls is much smaller than the wavelength. This is possible if one of the slabs has a negative permeability. Here we show that these subwavelength “resonators” resonate only if the permeability of at least one of the slabs is frequency dependent. Thus, there is no advantage of using these structures as frequency‐selective devices. However, we have found that these systems can, in principle, be used as memory devices for evanescent fields, because the boundary conditions are identically satisfied for all plane evanescent waves inside the cavity. The physical meaning and practical limitations for possible realizations are discussed. The analysis is supported by FDTD simulations. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 153–157, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11001