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Core-shell structure of free-standing metallic membranes with narrow slits. (a) The schematic illustrates the geometrical parameters and the reflection coefficient. (b) Learning curves of the resonance wavelength (right) and resonance width (left), calculated as a function of the grating period and normalized slit aperture . The experimental results are reported in red points [cf. Fig. 2(b)]. (c) Typical Fano-shape transmission spectrum calculated using exact modal expansion (Ref. 18) , which illustrates the angular tolerance at small incidence.
Realization of the mosaic of bandpass filters in a single membrane. (a) SEM and optical images of the membrane. (b) Measured transmission spectra of the ten bandpass filters at normal incidence. The period (in micrometer) and slit aperture of the grating series are : 2.45/0.131; 2.8/0.129; 3.15/0.124; 3.4/0.138; 3.6/0.133; 3.85/0.15; 4.05/0.151; 4.3/0.128; 4.5/0.153; 4.7/0.16. (c) Schematic view of the multichannel camera including the mosaic of filters for multispectral imaging.
Multispectral imaging. (a) Images of a lighter flame recorded by the multichannel camera including the mosaic of bandpass filters and an additional nonfiltered channel (left). (b) Comparison of the emission spectra of a whole lighter flame measured by a FTIR spectrometer (blue curve with a sharp edge at , color online), and of the brighter point of the flame obtained from the ten multispectral images (red curve, color online).
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