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Dependence of phase shift on the wavelength for different slit width a and spacer thickness t: (a) t = 0.1 mm, and a = 1.0 or 0.3 mm; (b) a = 1.0 mm, and t = 0.1 or 0.3 mm. Here d = 20 mm. The correspondence between the phase shift φ3 (the line) and (m = 0, 1, 2) are shown in (c), where d = 20 mm, a = 0.5 mm, and t = 0.2 mm. The inset of (c) shows the zero-phase point A (the circles) as a function of lattice period d (where we fix a = 1.0 mm and t = 0.2 mm), which track the position of HFP mode in the spacer closely (the line).
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