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Optics Letters

Optics Letters


  • 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)

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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

E. Yablonovitch, "Engineered omnidirectional external-reflectivity spectra from one-dimensional layered interference filters," Opt. Lett. 23, 1648-1649 (1998)

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  1. J. N. Winn, Y. Fink, S. Fan, and J. D. Joannopoulos, Opt. Lett. 23, 1573 (1998).
  2. E. Yablonovitch, J. Opt. Soc. Am. B 10, 283 (1993).
  3. A. Yariv and P. Yeh, Optical Waves in Crystals (Wiley, New York, 1984).
  4. A. Scherer, J. L. Jewell, and J. P. Harbison, Opt. Photon. News 2(12), 9 (1991).
  5. P. Yeh, Optical Waves in Layered Media (Wiley, New York, 1988).
  6. W. J. Gunning, “Rugate filter incorporating parallel and series addition,” U.S. patent 4, 952, 025 (August 28, 1990); W. E. Johnson R. L. Crane, Proc. SPIE 2046, 88 (1993).

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