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Excitation of bulk plasmon polaritons at four BPP mode bands. Reflectance spectra as a function of incident angle are shown for a) mode band 1 (2100–2050 nm), b) mode band 2 (1100–1050 nm), c) mode band 3 (750–700 nm), and d) mode band 4 (550–500 nm). The angular resolution of the instrument was set to 1°.
