Figure 4 | Scientific Reports

Figure 4

From: Precise and diffraction-limited waveguide-to-free-space focusing gratings

Figure 4

Intensity profiles along x (a) and y (b) imaged at a height of z = 50 μm. The inset shows the recorded intensity profile at this height, with the solid and dotted lines corresponding to the horizontal axes for (a) and (b) respectively. In each case the measured data points (black circles) are taken from a set of images with exposure times varying by a factor of 400 to allow sufficient dynamic range. Ideal Gaussian fits with 1/e 2 half-widths of 2.0 μm (a) and 2.3 μm (b) are shown in the dotted gray lines, as well as in (a) the result of a 1D diffraction integral calculation (solid red line) for the intensity profile resulting from the cosine-shape field profile expected along x in the grating region.

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