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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 23, Iss. 21 — Nov. 1, 1998
  • pp: 1648–1649

Engineered omnidirectional external-reflectivity spectra from one-dimensional layered interference filters

E. Yablonovitch  »View Author Affiliations


Optics Letters, Vol. 23, Issue 21, pp. 1648-1649 (1998)
http://dx.doi.org/10.1364/OL.23.001648


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Abstract

Owing to optical refraction, external rays that are incident upon a high-refractive-index medium fall within a small internal cone angle. A one-dimensionally periodic Bragg structure can reflect over an angular acceptance range that is greater than the small internal refraction cone, if the internal refractive-index contrast is sufficient. Thus Winn et al. [Opt. Lett. (to be published)] charted the range of refractive indices at which omnidirectional external reflection occurs. A wide spectral gap requires a high-index contrast. It is proposed that, by chirping or grading the periodicity of the structure, one can cover an arbitrarily wide spectral range with only a modest index contrast and, furthermore, that arbitrary spectral shapes can be produced. The graded-periodicity approach requires only a modest index contrast, provided that the average refractive index is >2 .

© 1998 America

OCIS Codes
(350.2460) Other areas of optics : Filters, interference

Citation
E. Yablonovitch, "Engineered omnidirectional external-reflectivity spectra from one-dimensional layered interference filters," Opt. Lett. 23, 1648-1649 (1998)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-23-21-1648

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