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(a) Fluorescence images taken at single angle θ = 11.52 ° where the region with the SiO2 coating satisfying resonant condition (b) Fluorescence images taken at single angles θ = 11.9 ° where the region without SiO2 coating is satisfying the resonant condition. (c) Selectively enhanced “signal” fluorescence image showing superior contrast to (a). (d) Selectively enhanced “background” fluorescence image showing superior contrast to (b).
