Fig. 6: Wavelength-dependent near-field energy. | Light: Science & Applications

Fig. 6: Wavelength-dependent near-field energy.

From: Radiationless anapole states in on-chip photonics

Fig. 6

a Near-field map of the in-plane field amplitude collected 30 nm above a silicon disk of nominal radius 375 nm (highlighted by the white dashed outline) in wavelength-steps of 40 nm around the point of maximum near-field energy (highlighted by a gray dashed box). The maps are normalized to the maximum field amplitude for the map of maximum near-field energy. Scale bar: 500 nm. b Spectral evolution of the near-field energy normalized to the emission of the feed waveguide. The gray line shows a Gaussian fit to the experimental data points. Inset: influence of the near-field probe on the spectral position of the energy maximum, highlighting the blue-shift when reducing the distance z between disk and probe38,39

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