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The SFP resonance in the microwave band for the structure with d = 20 mm, a = 0.3 mm, h = 5 mm, and t = 0.1 mm. (a) Phase shift of slit mode at the slit openings (the arrow indicates the SFP resonance); (b) Zero-order reflection (the line) and the absolute value of the FP-like resonance factor (the circles). The resonance around 20 mm is dominated by the grating surface modes.
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