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

Applied Optics
Donald K JacobM G Moharam

Abstract

Cascaded identical resonant grating reflection filters are shown to exhibit flattened spectral responses when the individual filter elements are cascaded pi 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 pi 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.

References

Jul 7, 2000·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·D K JacobM G Moharam
Sep 12, 2001·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·D K JacobM G Moharam
May 10, 1995·Applied Optics·S S Wang, R Magnusson

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Citations

Jul 1, 2010·Optics Express·Deyin ZhaoWeidong Zhou
Jun 7, 2003·Applied Optics·Samuel T Thurman, G Michael Morris
Jul 3, 2010·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Akira SatoMakoto Sato
Oct 14, 2017·Optics Letters·Katsuaki YamadaRobert Magnusson
Sep 13, 2019·Optics Express·Leonid L DoskolovichVictor A Soifer
Oct 4, 2007·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Carsten RockstuhlFalk Lederer

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