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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 34 — Dec. 1, 2001
  • pp: 6319–6326

Forbidden gaps in finite periodic and quasi-periodic Cantor-like dielectric multilayers at normal incidence

E. Cojocaru  »View Author Affiliations


Applied Optics, Vol. 40, Issue 34, pp. 6319-6326 (2001)
http://dx.doi.org/10.1364/AO.40.006319


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Abstract

Periodic and quasi-periodic Cantor-like bandgap structures that bordered upon a medium of refractive index n0 are analyzed. An immersion model is used with the assumption that each layer is embedded between two identical regions of refractive index n0 and thickness d0, where d0 is set equal to zero. Transmittance and group velocity are determined. Their dependence on n0 is emphasized. Relations for the midgap value of the normalized group velocity are given. By use of these relations, diagrams are completed at different values of n0, showing the pairs of quarter-wave-layer refractive indices at which there is an apparent superluminal tunneling through the finite periodic and quasi-periodic Cantor-like bandgap structures.

© 2001 Optical Society of America

OCIS Codes
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.1480) Optical devices : Bragg reflectors
(230.4170) Optical devices : Multilayers
(240.7040) Optics at surfaces : Tunneling
(310.6870) Thin films : Thin films, other properties
(350.5030) Other areas of optics : Phase

History
Original Manuscript: December 19, 2000
Revised Manuscript: June 27, 2001
Published: December 1, 2001

Citation
E. Cojocaru, "Forbidden gaps in finite periodic and quasi-periodic Cantor-like dielectric multilayers at normal incidence," Appl. Opt. 40, 6319-6326 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-34-6319


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