Title

Flat–Top Narrow-Band Spectral Response Obtained From Cascaded Resonant Grating Reflection Filters

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.

Publication Date

3-1-2002

Publication Title

Applied Optics

Volume

41

Issue

7

Number of Pages

1241-1245

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/AO.41.001241

Socpus ID

0036507989 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0036507989

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