Schematic illustration of the formation of the FP image shown in Fig. 3(c). The extreme of the five arrows point to the shifted diffraction spots that would be produced by the plasmonic crystal if the light would leak only in the direction determinate by the vectors (a) ~ k k and (b) À ~ k k. The only one of the five arrows extremes, which is inside of the objective lens numerical aperture, contributes to the formation of the observed portion of rings.

Contexts in source publication

Context 1

... coverslip. The leaked light collected by the microscope objective lens is the light used for imaging; therefore, the observed FP and RP images are formed due to the incoherent superposition of the intensity distributions at the micro- scope's FP and RP corresponding to the leaked light coupled to evanescent waves propagating in all directions. 14 Fig. 6 illustrates how the FP image shown in Figs. 3(c) and 5(a) was formed by the incoherent superposition of diffraction patterns corresponding to different illumination directions. The red spots correspond to the diffraction pattern that would be produced by the photonic crystal under out-of-plane per- pendicular illumination. The arrows ...

Context 2

... angle. 14 The five extremes of the vectors in Figs. 6(a) or 6(b) form an instance of the shifted diffraction pattern that would be observed if the light would only leak in a particular direc- tion. In both instances, only one of the first-order shifted dif- fraction spots can be collected by the objective lens. This is because, as it is shown in Figs. 6(a) and 6(b), the zero-order shifted diffraction spot and three of the four first-order shifted diffraction spots are outside of the numerical aperture of the objective lens. The portions of rings observed in the FP image are formed by the simultaneous rotation of the five vectors. 14 For any leaking direction at most, a diffraction spot is ...