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Figure 2 | EPJ Quantum Technology

Figure 2

From: Anomalous diffraction of matter waves with minimal quantum metasurfaces

Figure 2

(a) The quantity \((\theta +\theta _{-1})\) represented with respect to incidence angle θ and the grating period \(k_{0}b\). The red and black dashed lines denote the minimum \(k_{0}b\) for each θ beyond which the corresponding diffraction order gets activated. Contour plot concerns the scenario that only the orders \(u=0,-1\) are propagated. (b) The upper and lower limits for the energy E of the impinging particle for which only the first anomalous order \(u=-1\) (plus the Snell’s one, \(u=0\)) is guided according to (7), as function of incidence angle θ for various host media (\(b=2.5\text{ nm}\))

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