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Reflection spectra as a function of wavelength and structure sizes for the THz (a–c) and infrared (d–f) regime. In the THz band, we fix d = 20 μm and set: (a) a = 1 μm, t = 0.5 μm; (b) a = 1 μm, h = 5 μm; and (c) h = 5 μm, t = 0.5 μm. In the infrared regime, we fix d = 2000 nm and set: (d) a = 50 nm, t = 20 nm; (e) a = 50 nm, h = 100 nm; and (f) h = 100 nm, t = 20 nm.
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