Flat-top narrow-band spectral response obtained from cascaded resonant grating reflection filters.
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.
Jacob
Donald K
DK
School of Optics/Center for Research and Education in Optics and Lasers, University of Central Florida, Orlando 32816-2770, USA.
Dunn
Steven C
SC
Moharam
M G
MG