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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 7 — Mar. 1, 2002
  • pp: 1241–1245

Flat-top narrow-band spectral response obtained from cascaded resonant grating reflection filters

Donald K. Jacob, Steven C. Dunn, and M. G. Moharam  »View Author Affiliations


Applied Optics, Vol. 41, Issue 7, pp. 1241-1245 (2002)
http://dx.doi.org/10.1364/AO.41.001241


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Abstract

Cascaded identical resonant grating reflection filters are shown to exhibit flattened spectral responses when the individual filter elements are cascaded π out of phase. Off resonance, the net response of a cascaded arrangement is given approximately by the sum of the individual filter responses. Cascading filters π out of phase thus result in a reduction in the off-resonance reflection levels and correspondingly an increase in the spectral bandpass ratio. The spectral bandpass ratio is a figure of merit used to gauge the flatness of a response and is defined as the ratio of the linewidth at an efficiency of 90% to the linewidth at an efficiency of 10%. Cascading two and three filters in this manner results in respective increases in the spectral bandpass ratio of three times and more than five times that of a single filter.

© 2002 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1950) Diffraction and gratings : Diffraction gratings

History
Original Manuscript: June 30, 2001
Revised Manuscript: October 4, 2001
Published: March 1, 2002

Citation
Donald K. Jacob, Steven C. Dunn, and M. G. Moharam, "Flat-top narrow-band spectral response obtained from cascaded resonant grating reflection filters," Appl. Opt. 41, 1241-1245 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-7-1241

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