Fig. 4: Far-field out-of-plane-scattering measurements. | Light: Science & Applications

Fig. 4: Far-field out-of-plane-scattering measurements.

From: Radiationless anapole states in on-chip photonics

Fig. 4

a Sketch of the experimental set-up. b SEM picture of one of the fabricated circuits, showing the input waveguide (with an external lensed fiber sketched), a Y-splitter, and two waveguides, both ended in an abrupt termination, and one of them having a disk (nominal disk radius r = 350 nm) close to the termination. Scale bar: 10 μm. c SEM image showing in detail the disk and the waveguide termination. Scale bar: 400 nm. d Experimental results of the out-of-plane scattering normalized to the value for a bare waveguide termination, recorded for disks with different radii (nominal values shown in the figure) in two different samples

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